Signal Transformer
Standard and Custom
Power Transformers
Design and Construction Without Equal
Because we pride ourselves in listening to what
our customers say, we at Signal have always been
able to develop innovative, quality products that meet
changing requirements. Our success is built on
continuously
addressing all
current major
concerns i.e.
flammability, high
temperature mate-
rials, and design
criteria such as:
•Smaller size
and weight
(For example,
see our MPI, HPI & M4L Series)
•Better performance through improved volumetric
efficiency
(For example, see our M4L series)
•Higher isolation while eliminating crossovers of
primary and secondary leads
(For example,
see our 14A series)
•Superior suppression of radiated magnetic field
(For example, see our IF series)
Technical Support Without Equal
With one of the industries largest staff of applica-
tion engineers, supported by the latest CAD/CAM
equipment, our engineering team responds quickly
to your specific application needs, custom require-
ments, and your quotation requests. Please don’t
hesitate to call, write, or fax us direct.
The Signal Way of Doing Business…
(Often imitated, but
NEVER
equalled)
Typical example cross section: Model A41
2
Independent and isolated
primary & secondary
windings
High
performance
lamination Full insulating
shroud
© Copyright 1994 by Signal Transformer Co., Inc., Inwood, NY. All International Rights Reserved.
All specifications subject to change without notice. Consult factory for latest specifications.
Printed in U.S.A.—Catalog ST-5
At Signal Transformer, we are committed to providing
the highest grade magnetics for customers who demand
total reliability, on-time delivery and competitive pricing.
Year after year, independent brand preference studies
conducted by leading electronic trade journals, have
shown that engineers and buyers consistently vote
Signal as the No. 1 preferred source for magnetics.
For almost 40 years, we’ve led the magnetics
industry with innovation, creativity, and reliability by:
•Pioneering and perfecting direct sales of
off-the-shelf transformers and chokes to the user.
•Maintaining the largest inventories—over 1,000
different chokes and transformers in ranges
from 1 VA to 10 KVA, available off-the-shelf
for PRONTO shipment.
•Offering customized J.I.T. programs.
•Providing annual contract programs with
the most competitive volume pricing.
•Obtaining the latest safety agency certifications
including UL, CSA, VDE, IEC, EN
Delivery Speed Without Equal
PRONTOSM (24-Hour Shipment)
Our PRONTO shipment program is simple. We
ship off-the-shelf products within 24 Hours, and, in
most cases the same day!
We are able to make this
commitment because we
match computerized inventory
production schedules with
industry requirements. Larger
production orders are comfort-
ably scheduled to meet J.I.T.
or any delivery scheduling.
In fact, each year over 20,000 orders are shipped to
satisfied customers, on-time, every time.
SM
Quality Assurance Without Equal
Through years of extensive magnetics manufactur-
ing experience, Signal has developed a unique,
world-class Total Quality Program. This program
embodies the latest state-of-the-art manufacturing
processes and monitoring systems from first article
inspection through 100% electrical testing for key
performance and safety parameters.
Terms and Conditions:
How to Order
Simply call 516-239-5777 and ask to speak to one of our customer
service representatives waiting to answer your inquiry. If you wish
you may fax your order to our 24-hour fax line (516-239-7208) or
mail your purchase order to 500 Bayview Avenue, Inwood, New York,
11096. If faxing or mailing your order please be certain to include
your phone number so you can be reached if there are any questions
concerning your order.
Terms of Sale
Net 30 days to firms with acceptable D&B rating. Unrated firms, please
submit name of your bank and 3 major trade references. Other methods
are: C.O.D. for any of our stock transformers, cash in advance for
non-stock or custom transformers. We also accept MasterCard and
Visa which saves the additional C.O.D. charges.
Prices
Prices are published on our price sheet and are subject to change
without notice.
Extra Charges
All non-stock and custom transformer orders are subject to a
set-up charge.
3
Signal Transformer
CALL: 516-239-5777 • FAX: (24hrs) 516-239-7208
500 Bayview Avenue, Inwood, New York 11096
Custom Design Without Equal
At Signal, we’ve designed thousands of custom
products, and may have already solved your
problem. If not, we will! To make it easy to identify
your specific requirements, we’ve included a
Custom Magnetics Design Data Sheet in our
catalog. Our design engineering team welcomes
the opportunity to be of service.
Freight Policy
Orders are shipped FOB (point of origin). All UPS shipments are
prepaid and freight charges will be added to your invoice. All other
carriers are shipped freight collect unless we are otherwise instructed.
Damaged Shipment
Transformers shipped are carefully packed in compliance with carrier
requirements. Claims for loss or damage in transit must be made with
the carrier by the customer within 15 days of delivery. All shipments
should be unpacked and inspected immediately upon receipt. If damage
does not become apparent until shipment is unpacked, make a request
within 72 hours for inspection by the carrier’s agent and file with the
carrier. Any evidence of damage to packaging must be noted on the
freight bill or carrier’s receipt and signed by the carrier’s agent. Failure
to do this will result in the carrier refusing to honor the claim.
Return Policy
You will find that the quality products purchased from Signal
Transformer have been manufactured to give you the high level of
quality you expect. Our goal has always been to make sure you are
completely satisfied every time you do business with us. If a qualified
reason exists, a Return Material Authorization will be given to you
promptly and a replacement order will be processed immediately at
the time of your call.
Warranty
Signal products are warranted to be free of defects in materials and
workmanship when operated within specified operating conditions.
Contact Signal for specific warrantee, terms and conditions.
Power Range (VA) Secondary Voltage Range Agency Approvals Family Page #
2.5–10 5V–36 VCT UL, CSA, VDE 14A-R 12
20–56 5V–36VCT UL, CSA, VDE 14A 13
20–56 5VDC & ± 12VDC or ± 15VDC UL, CSA, VDE 14A Triple Output 14
2–30 5V–230VCT UL, CSA, VDE IF 10-11
2–48 5V–230VCT UL, CSA LP 15
6–12 5VDC & ± 12VDC or ± 15VDC UL, CSA MPL Triple Output 19
1.1–36 5V–120VCT UL, CSA ST/DST 16
1.0–24 5V–120VCT UL, CSA PC/DPC 17
10–24 5VDC & ± 12VDC or ± 15VDC UL, CSA MPC/DMPC Triple Output 18
2.5–50 12V–24V UL 1585, Class 2 CL2 20
Printed Circuit Mount
Power Range (VA) Secondary Voltage Range Agency Approvals Family Page #
250–900 5V–230VCT UL, CSA MPI 7
2000–3500 115V–230V UL, CSA, VDE HPI 5
300–1000 115V UL, CSA, VDE M4L 6
25–175 5V–230VCT UL, CSA, VDE A41 8
25–80 5VDC & ± 12VDC or ± 15VDC UL, CSA, VDE A41 Triple Output 9
2.4–100 10Vct–120Vct UL, CSA 241/DP241 22
30–100 5VDC & ± 12VDC or ± 15VDC UL, CSA MT/DMT Triple Output 23
25–80 12V–24V UL 1585, Class 2 CL2 21
Chassis Mount
Power Range (VA) Secondary Voltage Range Family Page #
10–2000 5VCT–80VCT Rectifier Power 24-26
250–10,000 104V–240V Power Isolation 28-29
100–2000 115V–230V Auto Transformers 30
Supplemental Magnetics
Inductance Current Family Page #
.12–1000mH 1.0–200AMPS Chokes 27
Selector Chart
This selector chart was created to assist you in finding the corresponding page for the transformer
needed for your application.
How to use: •Select type of unit required, i.e. printed circuit, chassis mount, etc.
•Select power range (more than one family may be available).
•Select voltage range (AC or DC voltage).
•Select agency approvals necessary, i.e., UL, CSA, VDE, UL1585, Class 2.
•Identify family and turn to corresponding page number.
4
Signal Transformer
CALL: 516-239-5777 • FAX: (24hrs) 516-239-7208
500 Bayview Avenue, Inwood, New York 11096
5
High Power International Transformers
If you don’t see a specific part that meets your requirement, see page 31 for our custom magnetics design data sheet.
Greater Performance in Less Space and Weight
Signal’s HPI transformers feature unique coil construction that complies with
international safety standards and results in a smaller and lighter transformer.
General Specifications
■Power – 2000 VA to 3500 VA
■Dielectric Strength – 4000VRMS Hipot
■Primaries – Dual/tapped primaries (100V, 115V, 215V, 230V - 50/60 Hz)
■Secondaries – Series or parallel secondaries (115V or 230V)
■Electrostatic Shield – 5 mils thick copper foil
■Terminals – Screw type barrier strip
■Leakage – Leakage current meets medical applications
■Insulation – Class H insulation (180°C)
■Flammability Rating – Bobbin material meets UL 94V0
Agency Standards
■UL recognized to UL 506 (File #E63829)
■CSA certified to C22.2 #66 (File #LR 51265)
■VDE certified to VDE 0550 (File #2994)
■TUV certified to IEC 950 (Lic #R9373110.2)
Signal Transformer
SM
CALL: 516-239-5777 • FAX: (24hrs) 516-239-7208
500 Bayview Avenue, Inwood, New York 11096
Part Secondary Mechanical Dimensions
No.
VA RMS Rating
(Size) Series Parallel L W H A ML MW Wgt
HPI-20 2000 230V @ 8.7A 115V @ 17.4A 7.50˝ 5.60˝ 6.56˝ 6.25˝ 5.75˝ 4.35˝ 41.3 lbs
190.5mm 142.2mm 166.6mm 158.8mm 146.1mm 110.5mm 18.71 kg
HPI-27 2750 230V @ 12.0A 115V @ 24.0A 7.50˝ 6.23˝ 6.56˝ 6.25˝ 5.75˝ 4.98˝ 48.0 lbs
190.5mm 158.2mm 166.6mm 158.8mm 146.1mm 126.5mm 21.77 kg
HPI-35 3500 230V @ 15.2A 115V @ 30.4A 7.50˝ 7.33˝ 6.56˝ 6.25˝ 5.75˝ 6.08˝ 62.4 lbs
190.5mm 186.2mm 166.6mm 158.8mm 146.1mm 154.4mm 28.30 kg
C V f
RUGGED
TERMINAL
BLOCK
RUGGED
MOUNTING
BRACKETS
UNIQUE BOBBIN
COIL CONSTRUCTION
6
More-4-Less™ International Transformers
If you don’t see a specific part that meets your requirement, see page 31 for our custom magnetics design data sheet.
Greater Performance in Less Space
Signal’s M4L transformer series is designed using low loss steel,
high temperature magnet wire plus high temperature bobbins
and shroud. These unique design features result in a smaller
and lighter transformer for comparable power sizes.
General Specifications
■Power – 300 VA to 1000 VA
■Dielectric Strength – 4000VRMS Hipot
■Primaries – Style M4L-1 (105V, 115V, 125V - 50/60 Hz)
Style M4L-2 (210V, 230V, 250V - 50/60 Hz)
Style M4L-3 (100V, 115V, 200V, 230V - 50/60 Hz)
■Secondary – Single secondary (115V)
■Terminals – Quick-connect / screw type terminals
■Leakage – Leakage current to meet UL 544
■Insulation – Class F insulation (155°C)
■Flammability Rating – Bobbin and shroud material meet UL 94V0
Agency Standards
■UL recognized to UL 506 (File #E63829)
■UL recognized to UL 544 (File #E63829)
■CSA certified to C22.2 #66 (File #LR 51265)
■VDE certified to VDE 0805 / EN 60950 (File #1447)
■VDE certified to IEC 950
Signal Transformer
SM
CALL: 516-239-5777 • FAX: (24hrs) 516-239-7208
500 Bayview Avenue, Inwood, New York 11096
Part Number VA Secondary Mtg. Dim. Mtg.
115V 230V 100-115/200-230V (Size) RMS LWHABC
ML MW Screw Wgt
Nominal Nominal Nominal Rating
M4L-1-3 M4L-2-3 M4L-3-3 300 115V @ 2.6A 3.50˝ 3.87˝ 3.75˝ 1.12˝ .62˝ 3.12˝ 2.50˝ 3.12˝ #10 7.0 lbs
88.9mm 98.4mm 95.3mm 28.6mm 15.9mm 79.4mm 63.5mm 79.4mm 3.18 kg
M4L-1-6 M4L-2-6 M4L-3-6 600 115V @ 5.2A 3.87˝ 4.93˝ 4.50˝ 1.18˝ .75˝ 3.75˝ 3.00˝ 4.06˝ #10 14.3 lbs
98.4mm 125.4mm 114.3mm 30.2mm 19.1mm 95.3mm 76.2mm 103.2mm 6.49 kg
M4L-1-10 M4L-2-10 M4L-3-10 1000 115V @ 8.7A 5.37˝ 5.87˝ 5.25˝ 1.50˝ .87˝ 4.37˝ 3.50˝ 4.06˝ 1/4 22.0 lbs
136.5mm 149.2mm 133.4mm 38.1mm 22.2mm 111.1mm 88.9mm 119.1mm 10.0 kg
C V f
Shrouded Terminal
Block (Meets all
standards)
Insulating
Shroud
“Quick-
connect”
Terminal
Screw
Connection
Dual Bobbins
Multi-Purpose International Transformers
CALL: 516-239-5777 • FAX: (24hrs) 516-239-7208
500 Bayview Avenue, Inwood, New York 11096
Signal Transformer
7
If you don’t see a specific part that meets your requirement, see page 31 for our custom magnetics design data sheet.
High Performance with Greater Volumetric Efficiency
Signal’s MPI transformers feature higher volumetric efficiency for improved
performance compared to conventional 50/60 Hz transformers. They also incorporate
international safety features which make them ideal for worldwide applications.
General Specifications
■Power – 200 VA to 900 VA
■Dielectric Strength – 4000VRMS Hipot
■Primaries – Dual/tapped primaries (100V, 115V, 200V, 215V, 230V - 50/60 Hz)
■Secondaries – Series or parallel secondaries
■Electrostatic Shield – 5 mils thick copper foil
■Terminals – Quick-connect/screw type terminals
■Leakage – Leakage current meets medical applications
■Insulation – Class F insulation (155°C)
Agency Standards
■UL recognized to UL 506 (File #E63829)
■CSA certified to C22.2 #66 (File #LR 51265)
■Designed to meet VDE 0805 and VDE 0550
■Designed to meet IEC 950
SM
SECONDARY SECONDARY
Part No. Series Parallel Part No. Series Parallel
MPI-200-10 10VCT @ 20.0A 5V @ 40.0A MPI-200-28 28VCT @ 7.1A 14V @ 14.2A
MPI-250-10 10VCT @ 25.0A 5V @ 50.0A MPI-250-28 28VCT @ 8.9A 14V @ 17.9A
MPI-300-10 10VCT @ 30.0A 5V @ 60.0A MPI-300-28 28VCT @ 10.7A 14V @ 21.4A
MPI-400-10 10VCT @ 40.0A 5V @ 80.0A MPI-400-28 28VCT @ 14.3A 14V @ 28.6A
MPI-650-10 10VCT @ 65.0A 5V @ 130.0A MPI-650-28 28VCT @ 23.2A 14V @ 46.4A
MPI-900-10 10VCT @ 90.0A 5V @ 180.0A MPI-900-28 28VCT @ 32.1A 14V @ 64.2A
MPI-200-12 12VCT @ 16.7A 6V @ 33.3A MPI-200-36 36VCT @ 5.6A 18V @ 11.2A
MPI-250-12 12VCT @ 20.8A 6V @ 41.7A MPI-250-36 36VCT @ 6.9A 18V @ 13.8A
MPI-300-12 12VCT @ 25.0A 6V @ 50.0A MPI-300-36 36VCT @ 8.3A 18V @ 16.7A
MPI-400-12 12VCT @ 33.3A 6V @ 66.6A MPI-400-36 36VCT @ 11.1A 18V @ 22.2A
MPI-650-12 12VCT @ 54.2A 6V @ 108.4A MPI-650-36 36VCT @ 18.1A 18V @ 36.2A
MPI-900-12 12VCT @ 75.0A 6V @ 150.0A MPI-900-36 36VCT @ 25.0A 18V @ 50.0A
MPI-200-16 16VCT @ 12.5A 8V @ 25.0A MPI-200-40 40VCT @ 5.0A 20V @ 10.0A
MPI-250-16 16VCT @ 15.6A 8V @ 31.2A MPI-250-40 40VCT @ 6.3A 20V @ 12.6A
MPI-300-16 16VCT @ 18.8A 8V @ 37.6A MPI-300-40 40VCT @ 7.5A 20V @ 15.0A
MPI-400-16 16VCT @ 25.0A 8V @ 50.0A MPI-400-40 40VCT @ 10.0A 20V @ 20.0A
MPI-650-16 16VCT @ 40.6A 8V @ 81.2A MPI-650-40 40VCT @ 16.3A 20V @ 32.6A
MPI-900-16 16VCT @ 56.3A 8V @ 112.5A MPI-900-40 40VCT @ 22.5A 20V @ 45.0A
MPI-200-20 20VCT @ 10.0A 10V @ 20.0A MPI-200-48 48VCT @ 4.2A 24V @ 8.3A
MPI-250-20 20VCT @ 12.5A 10V @ 25.0A MPI-250-48 48VCT @ 5.2A 24V @ 10.4A
MPI-300-20 20VCT @ 15.0A 10V @ 30.0A MPI-300-48 48VCT @ 6.3A 24V @ 12.6A
MPI-400-20 20VCT @ 20.0A 10V @ 40.0A MPI-400-48 48VCT @ 8.3A 24V @ 16.7A
MPI-650-20 20VCT @ 32.5A 10V @ 65.0A MPI-650-48 48VCT @ 13.5A 24V @ 27.1A
MPI-900-20 20VCT @ 45.0A 10V @ 90.0A MPI-900-48 48VCT @ 18.8A 24V @ 37.5A
MPI-200-24 24VCT @ 8.3A 12V @ 16.7A MPI-200-230 230VCT @ 0.87A 115V @ 1.7A
MPI-250-24 24VCT @ 10.4A 12V @ 20.8A MPI-250-230 230VCT @ 1.1A 115V @ 2.2A
MPI-300-24 24VCT @ 12.5A 12V @ 25.0A MPI-300-230 230VCT @ 1.3A 115V @ 2.6A
MPI-400-24 24VCT @ 16.7A 12V @ 33.3A MPI-400-230 230VCT @ 1.7A 115V @ 3.4A
MPI-650-24 24VCT @ 27.1A 12V @ 54.2A MPI-650-230 230VCT @ 2.8A 115V @ 5.6A
MPI-900-24 24VCT @ 37.5A 12V @ 75.0A MPI-900-230 230VCT @ 3.9A 115V @ 7.8A
VA (Size) L W H ML MW WGT
200 3.750˝ 4.203˝ 3.720˝ 3.250˝ 2.800˝ 6.22 lbs
95.3mm 106.6mm 94.5mm 82.6mm 71.1mm 2.82 kg
250 4.125˝ 3.898˝ 4.000˝ 3.625˝ 2.601˝ 6.76 lbs
104.8mm 99.0mm 101.6mm 92.1mm 66.1mm 3.07 kg
300 4.125˝ 4.223˝ 4.000˝ 3.625˝ 2.915˝ 7.80 lbs
104.8mm 107.3mm 101.6mm 92.1mm 74.0mm 3.54 kg
400 4.125˝ 4.805˝ 4.000˝ 3.625˝ 3.505˝ 9.82 lbs
104.8mm 122.0mm 101.6mm 92.1mm 89.0mm 4.46 kg
650 5.250˝ 4.430˝ 4.800˝ 4.500˝ 3.415˝ 14.83 lbs
133.3mm 112.5mm 121.9mm 114.3mm 86.7mm 6.73 kg
900 5.250˝ 5.197˝ 4.800˝ 4.500˝ 4.205˝ 19.84 lbs
133.3mm 132.0mm 121.9mm 114.3mm 106.8mm 9.01 kg
C V
Unique Coil Construction
Quick Connect
Screw Type
Terminal
8
All-4-One™ International Transformers
Chassis Mount
If you don’t see a specific part that meets your requirement, see page 31 for our custom magnetics design data sheet.
International Standards at Lower Cost and Better Performance
Signal’s A41 transformers provide the high isolation, creepage
and clearance necessary to comply with international safety standards.
General Specifications
■Power – 25 VA to 175 VA
■Dielectric Strength – 4000VRMS Hipot
■Primaries – Dual primaries (115/230 V - 50/60 Hz)
■Secondaries – Series or parallel secondaries
■Electrostatic Shield – Not necessary, dual bobbin construction
■Terminals – Solder lug / quick-connect type terminals
■Leakage – Leakage current to meet UL 544
■Insulation – Class F insulation (155°C)
■Flammability Rating – Bobbin and shroud material meet UL 94V0
Agency Standards
■UL recognized to UL 506 (File #E63829)
■CSA certified to C22.2 #66 (File #LR 51265)
■VDE certified to VDE 0805 / EN 60950 (File #1448)
■VDE certified to IEC 950
Signal Transformer
SM
CALL: 516-239-5777 • FAX: (24hrs) 516-239-7208
500 Bayview Avenue, Inwood, New York 11096
VA Secondary RMS Rating
Part No. (Size) Series Parallel
A41-25-10 25 10VCT @ 2.5A 5V @ 5.0A
A41-43-10 43 10VCT @ 4.3A 5V @ 8.6A
A41-80-10 80 10VCT @ 8.0A 5V @ 16.0A
A41-130-10 130 10VCT @ 13.0A 5V @ 26.0A
A41-175-10 175 10VCT @ 17.5A 5V @ 35.0A
A41-25-12 25 12.6VCT @ 2.0A 6.3V @ 4.0A
A41-43-12 43 12.6VCT @ 3.4A 6.3V @ 6.8A
A41-80-12 80 12.6VCT @ 6.3A 6.3V @ 12.6A
A41-130-12 130 12.6VCT @ 10.3A 6.3V @ 20.6A
A41-175-12 175 12.6VCT @ 14.0A 6.3V @ 28.0A
A41-25-16 25 16VCT @ 1.6A 8V @ 3.2A
A41-43-16 43 16VCT @ 2.7A 8V @ 5.4A
A41-80-16 80 16VCT @ 5.0A 8V @ 10.0A
A41-130-16 130 16VCT @ 8.1A 8V @ 16.2A
A41-175-16 175 16VCT @ 11.0A 8V @ 22.0A
A41-25-20 25 20VCT @ 1.25A 10V @ 2.5A
A41-43-20 43 20VCT @ 2.2A 10V @ 4.4A
A41-80-20 80 20VCT @ 4.0A 10V @ 8.0A
A41-130-20 130 20VCT @ 6.5A 10V @ 13.0A
A41-175-20 175 20VCT @ 8.8A 10V @ 17.6A
A41-25-24 25 24VCT @ 1.0A 12V @ 2.0A
A41-43-24 43 24VCT @ 1.8A 12V @ 3.6A
A41-80-24 80 24VCT @ 3.3A 12V @ 6.6A
A41-130-24 130 24VCT @ 5.4A 12V @ 10.8A
A41-175-24 175 24VCT @ 7.3A 12V @ 14.6A
A41-25-28 25 28VCT @ 0.9A 14V @ 1.86A
A41-43-28 43 28VCT @ 1.5A 14V @ 3.0A
A41-80-28 80 28VCT @ 2.8A 14V @ 5.6A
A41-130-28 130 28VCT @ 4.6A 14V @ 9.2A
A41-175-28 175 28VCT @ 6.25A 14V @ 12.5A
A41-25-36 25 36VCT @ 0.7A 18V @ 1.4A
A41-43-36 43 36VCT @ 1.2A 18V @ 2.4A
A41-80-36 80 36VCT @ 2.2A 18V @ 4.4A
A41-130-36 130 36VCT @ 3.6A 18V @ 7.2A
A41-175-36 175 36VCT @ 4.8A 18V @ 9.6A
A41-25-230 25 230VCT @ 0.11A 115V @ 0.22A
A41-43-230 43 230VCT @ 0.19A 115V @ 0.38A
A41-80-230 80 230VCT @ 0.35A 115V @ 0.7A
A41-130-230 130 230VCT @ 0.57A 115V @ 1.14A
A41-175-230 175 230VCT @ 0.76A 115V @ 1.52A
Dimensions Terminals Mtg. Mtg. Dim. Mtg. Wgt
VA (Size) L W H A B C Style ML MW Screw
25 2.81˝ 1.87˝ 2.31˝ 2.00˝ 1.12˝ .31˝ .187˝ C2.37˝ – #6 1.25 lbs
71.4mm 47.6mm 58.7mm 50.8mm 28.6mm 7.9mm 4.75mm 60.3mm – 0.57 kg
43 3.12˝ 2.06˝ 2.68˝ 2.25˝ 1.12˝ .31˝ .187˝ C2.81˝ – #6 1.6 lbs
79.4mm 52.3mm 68.2mm 57.2mm 28.6mm 7.9mm 4.75mm 71.4mm – 0.73 kg
80 2.50˝ 2.37˝ 3.00˝ – 1.37˝ .31˝ .187˝ B2.00˝ 2.18˝ #6 2.8 lbs
63.5mm 60.3mm 76.2mm – 35.0mm 7.9mm 4.75mm 50.8mm 55.5mm 1.27 kg
130 2.81˝ 2.87˝ 3.37˝ – 1.62˝ .37˝ 0.25˝ B2.25˝ 2.50˝ #8 4.1 lbs
71.4mm 73.0mm 85.7mm – 41.3mm 9.5mm 6.35mm 57.2mm 63.5mm 1.86 kg
175 3.12˝ 2.87˝ 3.75˝ – 1.62˝ .37˝ 0.25˝ B2.50˝ 2.50˝ #8 5.5 lbs
79.4mm 73.0mm 95.3mm – 41.3mm 9.5mm 6.35mm 63.5mm 63.5mm 2.49 kg
C V f
9
All-4-One™ International Triple Output
Transformers • Chassis Mount
If you don’t see a specific part that meets your requirement, see page 31 for our custom magnetics design data sheet.
Signal Transformer
SM
CALL: 516-239-5777 • FAX: (24hrs) 516-239-7208
500 Bayview Avenue, Inwood, New York 11096
For 5 VDC and ±12 VDC or ±15 VDC Regulated Power Supplies
Which Require International Safety Certification
Signal’s A41 triple output transformers have chassis mount capability
plus all of the performance features of our split bobbin A41 series.
General Specifications
■Power -– 25 VA to 80 VA
■Dielectric Strength – 4000VRMS Hipot
■Primaries –Dual primaries (115/230 V - 50/60 Hz)
Input range (100V to 130V or 200V to 260V - 50/60 Hz)
■Secondaries – Dual complimentary outputs (5 VDC with ±12 VDC or 5 VDC
with ± 15 VDC)
■Electrostatic Shield – Not necessary, split bobbin construction
■Terminals – Solder lug/quick-connect type terminals
■Insulation – Class F insulation (155°C)
■Flammability Rating – Bobbin and shroud material meet UL 94V0
Agency Standards
■UL recognized to UL 506 (File #E63829)
■CSA certified to C22.2 #66 (File #LR 51265)
■VDE certified to VDE 0805 / EN 60950 (File #4362)
■VDE certified to IEC 950
@@
@
@@
Dimensions Terminal Mtg. Mtg. Dim. Mtg. Wgt
VA (Size) L W H A B C Style ML MW Screw
25 2.81˝ 1.87˝ 2.31˝ 2.00˝ 1.12˝ 0.31˝ 0.187˝ C2.37˝ – #6 1.25 lbs
71.4mm 47.6mm 58.7mm 50.8mm 28.6mm 7.9mm 4.75mm 60.3mm – 0.57 kg
43 3.12˝ 2.06˝ 2.68˝ 2.25˝ 1.12˝ 0.31˝ 0.187˝ C2.81˝ – #6 1.6 lbs
79.4mm 52.3mm 68.2mm 57.2mm 28.6mm 7.9mm 4.75mm 71.4mm – 0.73 kg
80 2.50˝ 2.37˝ 3.00˝ – 1.37˝ 0.31˝ 0.187˝ B2.00˝ 2.18˝ #6 2.8 lbs
63.5mm 60.3mm 76.2mm – 34.9mm 7.9mm 4.75mm 50.8mm 55.5mm 1.27 kg
@
Note ➀: Output capacitors C2and C4are required to stabilize regulators. Values can be 1MFD min. tantalum or 10MFD min. electrolytic, 20V min.
Note ➁: LM-338 is an adjustable regulator and MFR’s specifications (National Semiconductor) should be consulted for values of external components.
Note ➂: All IC’s are National Semiconductor types.
Note ➃: All bridges are EDI types
C2C4See Note ➀
VA DC Output Suggested Components
Part Number (Size) Regulator I Regulator II C1C3IC1➂IC2➂IC3➂D1➃D2➃
A41-25-512 25 5V @ 1.25A ±12V @ 150mA 4.1 KMFD 600 MFD LM-323K-5 LM-340K-12 LM-320K-12 PE20 PF20
A41-25-515 25 5V @ 1.25A ±15V @ 130mA 15 VDC 50 VDC LM-323K-5 LM-340K-15 LM-320K-15 PE20 PF20
A41-43-512 43 5V @ 2A ±12V @ 300mA 8 KMFD 1.1 KMFD LM-323K-5 LM-340K-12 LM-320K-12 PE20 PF20
A41-43-515 43 5V @ 2A ±15V @ 250mA 15 VDC 50 VDC LM-323K-5 LM-340K-15 LM-320K-15 PE20 PF20
A41-80-512 80 5V @ 3.5A ±12V @ 600mA 10 KMFD 2.1 KMFD LM-338➁LM-340K-12 LM-320K-12 PP20 PF20
A41-80-515 80 5V @ 3.5A ±15V @ 500mA 15 VDC 50 VDC LM-338➁LM-340K-15 LM-320K-15 PP20 PF20
C V f
10
International Flathead™ Low Profile
Transformers • Printed Circuit Mount
If you don’t see a specific part that meets your requirement, see page 31 for our custom magnetics design data sheet.
For Critical Height and International Safety Requirements
Signal’s IF transformers utilize unique insulating techniques,
including full encapsulation to meet international safety requirements.
These transformers are ideal for low power applications where
minimum height is required.
General Specifications
■Power – 2 VA to 30 VA
■Dielectric Strength – 4000VRMS Hipot
■Primaries – Dual primaries (115/230 V - 50/60 Hz)
■Secondaries – Series of parallel secondaries
■Electrostatic Shield – Not necessary, split bobbin construction
■Magnetic Field – Reduced magnetic radiation
■Height – .69 to 1.39 inches (17.5 to 35.3mm) high
■Insulation – Class B insulation (130°C)
Agency Standards
■UL recognized to UL 506 (File #E63829)
■CSA certified to C22.2 #66 (File #LR 51265)
■VDE certified to VDE 0805 / EN 60950 (File #8325)
■VDE certified to IEC 950
Signal Transformer
SM
CALL: 516-239-5777 • FAX: (24hrs) 516-239-7208
500 Bayview Avenue, Inwood, New York 11096
VA Secondary RMS Rating
Part No. (Size) Series Parallel
IF-2-10 2 10VCT @ 200mA 5V @ 400mA
IF-2-12 2 12VCT @ 170mA 6V @ 340mA
IF-2-16 2 16VCT @ 125mA 8V @ 250mA
IF-2-20 2 20VCT @ 100mA 10V @ 200mA
IF-2-24 2 24VCT @ 85mA 12V @ 170mA
IF-2-30 2 30VCT @ 70mA 15V @ 140mA
IF-2-34 2 34VCT @ 60mA 17V @ 120mA
IF-2-40 2 40VCT @ 50mA 20V @ 100mA
IF-2-56 2 56VCT @ 40mA 28V @ 80mA
IF-2-230 2 230VCT @ 9 mA 115V @ 18mA
IF-4-10 4 10VCT @ 400 mA 5V @ 800mA
IF-4-12 4 12VCT @ 335mA 6V @ 670mA
IF-4-16 4 16VCT @ 250mA 8V @ 500mA
IF-4-20 4 20VCT @ 200mA 10V @ 400mA
IF-4-24 4 24VCT @ 170mA 12V @ 340mA
IF-4-30 4 30VCT @ 135mA 15V @ 270mA
IF-4-34 4 34VCT @ 120mA 17V @ 240mA
IF-4-40 4 40VCT @ 100mA 20V @ 200mA
IF-4-56 4 56VCT @ 70mA 28V @ 140mA
IF-4-230 4 230VCT @ 18mA 115V @ 36mA
IF-6-10 6 10VCT @ 600mA 5V @ 1.20A
IF-6-12 6 12VCT @ 500mA 6V @ 1.00A
IF-6-16 6 16VCT @ 375mA 8V @ 750mA
IF-6-20 6 20VCT @ 300mA 10V @ 600mA
IF-6-24 6 24VCT @ 250mA 12V @ 500mA
IF-6-30 6 30VCT @ 200mA 15V @ 400mA
IF-6-34 6 34VCT @ 180mA 17V @ 360mA
IF-6-40 6 40VCT @ 150mA 20V @ 300mA
IF-6-56 6 56VCT @ 110mA 28V @ 220mA
IF-6-230 6 230VCT @ 25mA 115V @ 50mA
VA (Size) L W H ML MW Wgt
22.09˝ 1.73˝ 0.69˝ 1.87˝ 1.48˝ 4.6 oz
53.0mm 44.0mm 17.6mm 47.5mm 37.5mm 0.13 kg
42.09˝ 1.73˝ 0.77˝ 1.87˝ 1.48˝ 5.4 oz
53.0mm 44.0mm 19.6mm 47.5mm 37.5mm 0.15 kg
62.09˝ 1.73˝ 0.89˝ 1.87˝ 1.48˝ 6.9 oz.
53.0mm 44.0mm 22.6mm 47.5mm 37.5mm 0.20 kg
C V f
11
International Flathead™ Low Profile
Transformers • Printed Circuit Mount
If you don’t see a specific part that meets your requirement, see page 31 for our custom magnetics design data sheet.
For Critical Height and International Saf ety Requirements (conti nued)
Signal Transformer
SM
CALL: 516-239-5777 • FAX: (24hrs) 516-239-7208
500 Bayview Avenue, Inwood, New York 11096
VA Secondary RMS Rating
Part No. (Size) Series Parallel
IF-10-10 10 10VCT @ 1.00A 5V @ 2.00A
IF-10-12 10 12VCT @ 835mA 6V @ 1.67A
IF-10-16 10 16VCT @ 625mA 8V @ 1.25A
IF-10-20 10 20VCT @ 500mA 10V @ 1.00A
IF-10-24 10 24VCT @ 420mA 12V @ 840mA
IF-10-30 10 30VCT @ 335mA 15V @ 670mA
IF-10-34 10 34VCT @ 300mA 17V @ 600mA
IF-10-40 10 40VCT @ 250mA 20V @ 500mA
IF-10-56 10 56VCT @ 180mA 28V @ 360mA
IF-10-230 10 230VCT @ 45mA 115V @ 90mA
IF-14-10 14 10VCT @ 1.40A 5V @ 2.80A
IF-14-12 14 12VCT @ 1.20A 6V @ 2.40A
IF-14-16 14 16VCT @ 875mA 8V @ 1.75A
IF-14-20 14 20VCT @ 700mA 10V @ 1.40A
IF-14-24 14 24VCT @ 600mA 12V @ 1.20A
IF-14-30 14 30VCT @ 470mA 15V @ 940mA
IF-14-34 14 34VCT @ 415mA 17V @ 830mA
IF-14-40 14 40VCT @ 350mA 20V @ 700mA
IF-14-56 14 56VCT @ 250mA 28V @ 500mA
IF-14-230 14 230VCT @ 60mA 115V @ 120mA
IF-18-10 18 10VCT @ 1.80A 5V @ 3.60A
IF-18-12 18 12VCT @ 1.50A 6V @ 3.00A
IF-18-16 18 16VCT @ 1.15A 8V @ 2.30A
IF-18-20 18 20VCT @ 900mA 10V @ 1.80A
IF-18-24 18 24VCT @ 750mA 12V @ 1.50A
IF-18-30 18 30VCT @ 600mA 15V @ 1.20A
IF-18-34 18 34VCT @ 530mA 17V @ 1.06A
IF-18-40 18 40VCT @ 450mA 20V @ 900mA
IF-18-56 18 56VCT @ 320mA 28V @ 640mA
IF-18-230 18 230VCT @ 80mA 115V @ 160mA
IF-24-10 24 10VCT @ 2.40A 5V @ 4.80A
IF-24-12 24 12VCT @ 2.00A 6V @ 4.00A
IF-24-16 24 16VCT @ 1.50A 8V @ 3.00A
IF-24-20 24 20VCT @ 1.20A 10V @ 2.40A
IF-24-24 24 24VCT @ 1.00A 12V @ 2.00A
IF-24-30 24 30VCT @ 800mA 15V @ 1.60A
IF-24-34 24 34VCT @ 700mA 17V @ 1.40A
IF-24-40 24 40VCT @ 600mA 20V @ 1.20A
IF-24-56 24 56VCT @ 430mA 28V @ 860mA
IF-24-230 24 230VCT @ 105mA 115V @ 210mA
IF-30-10 30 10VCT @ 3.00A 5V @ 6.00A
IF-30-12 30 12VCT @ 2.50A 6V @ 5.00A
IF-30-16 30 16VCT @ 1.90A 8V @ 3.80A
IF-30-20 30 20VCT @ 1.50A 10V @ 3.00A
IF-30-24 30 24VCT @ 1.25A 12V @ 2.50A
IF-30-30 30 30VCT @ 1.00A 15V @ 2.00A
IF-30-34 30 34VCT @ 900mA 17V @ 1.80A
IF-30-40 30 40VCT @ 750mA 20V @ 1.50A
IF-30-56 30 56VCT @ 550mA 28V@ 1.10A
IF-30-230 30 230VCT @ 130mA 115V @ 260mA
VA (Size) L W H ML MW A B Wgt
10 2.66˝ 2.24˝ 0.89˝ 2.46˝ 1.97˝ 0.42˝ 0.45˝ 10.3 oz
67.6mm 57.0mm 22.6mm 62.5mm 50.0mm 10.6mm 11.3mm 0.29 kg
14 2.66˝ 2.24˝ 0.96˝ 2.46˝ 1.97˝ 0.42˝ 0.45˝ 11.9 oz
67.6mm 57.0mm 24.3mm 62.5mm 50.0mm 10.6mm 11.3mm 0.34 kg
18 2.66˝ 2.24˝ 1.09˝ 2.46˝ 1.97˝ 0.42˝ 0.45˝ 14.1 oz
67.6mm 57.0mm 27.6mm 62.5mm 50.0mm 10.6mm 11.3mm 0.40 kg
24 2.68˝ 2.26˝ 1.23˝ 2.46˝ 1.97˝ 0.43˝ 0.46˝ 16.5 oz
68.0mm 57.5mm 31.3mm 62.5mm 50.0mm 10.9mm 11.5mm 0.47 kg
30 2.68˝ 2.26˝ 1.39˝ 2.46˝ 1.97˝ 0.43˝ 0.46˝ 19.7 oz
68.0mm 57.5mm 35.3mm 62.5mm 50.0mm 10.9mm 11.5mm 0.58 kg
12
One-4-All™ International Transformers
Printed Circuit Mount
If you don’t see a specific part that meets your requirement, see page 31 for our custom magnetics design data sheet.
International Standards at Lower Cost and Better Performance
Signal’s 14A transformers are used in low power applications
and provide the high isolation, creepage and clearance necessary
to comply with international safety standards.
General Specifications
■Power – 2.5 VA to 10 VA
■Dielectric Strength – 4000VRMS Hipot
■Primaries – Dual primaries (115/230V - 50/60 Hz)
■Secondaries – Series or parallel secondaries
■Electrostatic Shield – Not necessary, split or dual bobbin construction
■Insulation – Class F insulation (155°C)
■Flammability – Bobbin and wrap around shroud material meet UL 94V0
Agency Standards
■UL recognized to UL 506 (File #E63829)
■CSA certified to C22.2 #66 (File #LR 51265)
■VDE certified to VDE 0805 / EN 60950 (File #1446)
■VDE certified to IEC 950
Signal Transformer
SM
CALL: 516-239-5777 • FAX: (24hrs) 516-239-7208
500 Bayview Avenue, Inwood, New York 11096
VA Dimensions Sq. Pin Mtg. Dim. Mtg. Screw Wgt
(Size) LWHABC
Dimensions M Size Qty
2.5 1.62˝ 1.43˝* 1.12˝ 0.200˝ 0.250˝ 1.000˝ 0.025” 1.06˝ #4 2 0.25 lbs
41.3mm 36.5mm 28.6mm 5.08mm 6.35mm 25.4mm 0.635mm 26.9mm 0.113 kg
5.0 1.62˝ 1.43˝ 1.37˝ 0.200˝ 0.400˝ 1.000˝ 0.025” 1.06˝ #4 2 0.37 lbs
41.3mm 36.5mm 34.9mm 5.08mm 10.16mm 25.4mm 0.635mm 26.9mm 0.168 kg
10.0 1.87˝ 1.56˝ 1.37˝ 0.200˝ 0.400˝ 1.140˝ 0.038” 1.25˝ #4 2 0.53 lbs
47.6mm 39.7mm 34.9mm 5.08mm 10.16mm 29.0mm 0.965mm 31.7mm 0.240 kg
*NOTE: Previously this dimension was 1.31˝; now it is 1.43˝.
VA Secondary RMS Rating
Part No. (Size) Series Parallel
14A-2.5R-10 2.5 10VCT @ 0.25A 5V @ 0.50A
14A-5.0R-10 5.0 10VCT @ 0.50A 5V @ 1.00A
14A-10R-10 10.0 10VCT @ 1.00A 5V @ 2.00A
14A-2.5R-12 2.5 12.6VCT @ 0.20A 6.3V @ 0.40A
14A-5.0R-12 5.0 12.6VCT @ 0.40A 6.3V @ 0.80A
14A-10R-12 10.0 12.6VCT @ 0.80A 6.3V @ 1.60A
14A-2.5R-16 2.5 16VCT @ 0.15A 8V @ 0.30A
14A-5.0R-16 5.0 16VCT @ 0.31A 8V @ 0.62A
14A-10R-16 10.0 16VCT @ 0.62A 8V @ 1.25A
14A-2.5R-20 2.5 20VCT @ 0.12A 10V @ 0.24A
14A-5.0R-20 5.0 20VCT @ 0.25A 10V @ 0.50A
14A-10R-20 10.0 20VCT @ 0.50A 10V @ 1.00A
14A-2.5R-24 2.5 24VCT @ 0.10A 12V @ 0.20A
14A-5.0R-24 5.0 24VCT @ 0.21A 12V @ 0.42A
14A-10R-24 10.0 24VCT @ 0.42A 12V @ 0.84A
14A-2.5R-28 2.5 28VCT @ 0.09A 14V @ 0.18A
14A-5.0R-28 5.0 28VCT @ 0.18A 14V @ 0.36A
14A-10R-28 10.0 28VCT @ 0.36A 14V @ 0.72A
14A-2.5R-36 2.5 36VCT @ 0.07A 18V @ 0.14A
14A-5.0R-36 5.0 36VCT @ 0.14A 18V @ 0.28A
14A-10R-36 10.0 36VCT @ 0.28A 18V @ 0.56A
C V f
13
One-4-All™ International Transformers
Printed Circuit Mount
If you don’t see a specific part that meets your requirement, see page 31 for our custom magnetics design data sheet.
Signal Transformer
SM
CALL: 516-239-5777 • FAX: (24hrs) 516-239-7208
500 Bayview Avenue, Inwood, New York 11096
VA Dimensions Sq.Pin Mtg. Dim. Mtg. Screw Wgt
(Size) LWHABC Dimensions M N P Size Qty
20 2.25˝ 1.87˝ 1.62˝ 0.400˝ 0.400˝ 1.460˝ 0.038” 1.50˝ – – #4 2 0.90 lbs
57.2mm 47.6mm 41.3mm 10.2mm 10.2mm 37.1mm 0.97mm 38.1mm – 0.41 kg
30 2.62˝ 1.18˝ 1.56˝ 0.550˝ 0.275˝ 1.680˝ 0.045” – 1.75˝ 2.18˝ #6 4 1.15 lbs
66.7mm 55.5mm 39.7mm 13.9mm 7.0mm 42.7mm 1.14 mm – 44.4mm 55.5mm 0.52 kg
56 3.00˝ 2.50˝ 1.81˝ 0.600˝ 0.300˝ 1.900˝ 0.045” – 2.00˝ 2.50˝ #6 4 1.70 lbs
76.2mm 63.5mm 46.0mm 15.2mm 7.6mm 48.3mm 1.14mm – 50.8mm 6.35mm 0.77 kg
Signal’s 14A transformers are used in low power applications
and provide the high isolation, creepage and clearance necessary
to comply with international safety standards.
General Specifications
■Power – 20 VA to 56 VA
■Dielectric Strength – 4000VRMS Hipot
■Primaries – Dual primaries (115/230V - 50/60 Hz)
■Secondaries – Series or parallel secondaries
■Electrostatic Shield – Not necessary, split or dual bobbin construction
■Insulation – Class F insulation (155°C)
■Flammability Rating – Bobbin and wrap around shroud material meet
UL 94V0
Agency Standards
■UL recognized to UL 506 (File #E63829)
■CSA certified to C22.2 #66 (File #LR 51265)
■VDE certified to VDE 0805 / EN 60950 (File #1446)
■VDE certified to IEC 950
VA Secondary RMS Rating
Part No. (Size) Series Parallel
14A-20-10 20 10VCT @ 2.0A 5V @ 4.0A
14A-30-10 30 10VCT @ 3.0A 5V @ 6.0A
14A-56-10 56 10VCT @ 5.6A 5V @ 11.2A
14A-20-12 20 12.6VCT @ 1.6A 6.3V @ 3.2A
14A-30-12 30 12.6VCT @ 2.4A 6.3V @ 4.8A
14A-56-12 56 12.6VCT @ 4.4A 6.3V @ 8.8A
14A-20-16 20 16VCT @ 1.25A 8V @ 2.5A
14A-30-16 30 16VCT @ 1.9A 8V @ 3.8A
14A-56-16 56 16VCT @ 3.5A 8V @ 7.0A
14A-20-20 20 20VCT @ 1.0A 10V @ 2.0A
14A-30-20 30 20VCT @ 1.5A 10V @ 3.0A
14A-56-20 56 20VCT @ 2.8A 10V @ 5.6A
14A-20-24 20 24VCT @ 0.83A 12V @ 1.66A
14A-30-24 30 24VCT @ 1.25A 12V @ 2.50A
14A-56-24 56 24VCT @ 2.33 A 12V @ 4.66A
14A-20-28 20 28VCT @ 0.72A 14V @ 1.44A
14A-30-28 30 28VCT @ 1.06A 14V @ 2.12A
14A-56-28 56 28VCT @ 2.0A 14V @ 4.0A
14A-20-36 20 36VCT @ 0.56A 18V @ 1.12A
14A-30-36 30 36VCT @ 0.82A 18V @ 1.64A
14A-56-36 56 36VCT @ 1.56A 18V @ 3.12A
International Standards at Lower Cost and Better Performance
C V f
VA DC Output Suggested Components
Part Number (Size) Regulator I Regulator II C1C3IC1➂IC2➂IC3➂D1➃D2➃
14A-20-512 20 5V @ 750mA ±12V @ 200mA 2.3 KMFD 600 MFD LM-323K-5 LM-340K-12 LM-320K-12 PE20 PF20
14A-20-515 20 5V @ 750mA ±15V @ 175mA 50 VDC 50 VDC LM-323K-5 LM-340K-15 LM-320K-15 PE20 PF20
14A-30-512 30 5V @ 1.25A ±12V @ 250mA 4.1 KMFD LM-323K-5 LM-340K-12 LM-320K-12 PE20 PF20
14A-30-515 30 5V @ 1.25A ±15V @ 200mA 15 VDC LM-323K-5 LM-340K-15 LM-320K-15 PE20 PF20
14A-56-512 56 5V @ 3A ±12V @ 300mA 10.0 KMFD 1.1 KMFD LM-338➁LM-340K-12 LM-320K-12 PP20 PF20
14A-56-515 56 5V @ 3A ±15V @ 250mA 15 VDC 50 VDC LM-338➁LM-340K-15 LM-320K-15 PP20 PF20
14
One-4-All™ International Triple Output
Transformers • Printed Circuit Mount
If you don’t see a specific part that meets your requirement, see page 31 for our custom magnetics design data sheet.
For 5 VDC and ±12 VDC or ±15 VDC Regulated Power Supplies
Which Require International Safety Certification
Signal’s 14A triple output transformers have pc board mount capability
plus all of the performance features of our split bobbin 14A series.
General Specifications
■Power -– 20 VA to 56 VA
■Dielectric Strength – 4000VRMS Hipot
■Primaries – Dual primaries (115/230V - 50/60 Hz)
Input range (100V to 130V or 200V to 260V - 50/60 Hz)
■Secondaries – Dual complimentary outputs (5 VDC with ±12 VDC or 5 VDC with ±15 VDC)
■Electrostatic Shield – Not necessary, split bobbin construction
■Insulation – Class F insulation (155°C)
■Flammability Rating – Bobbin and shroud material meet UL 94V0
Agency Standards
■UL recognized to UL 506 (File #E63829)
■CSA certified to C22.2 #66 (File #LR 51265)
■VDE certified to VDE 0805 / EN 60950 (File #4361)
■VDE certified to IEC 950
Signal Transformer
SM
CALL: 516-239-5777 • FAX: (24hrs) 516-239-7208
500 Bayview Avenue, Inwood, New York 11096
@@
@
@@
Dimensions Sq. Pin Mtg. Dim. Mtg. Screw Wgt
VA (Size) L W H A B C D Dimensions M N P Size Qty
20 2.25˝ 1.87˝ 1.62˝ 0.400˝ 0.400˝ 1.460˝ 0.200˝ 0.038” 1.50˝ – – #4 2 0.90 lbs
57.2mm 47.6mm 41.3mm 10.2mm 10.2mm 37.1mm 5.1mm 0.97mm 38.1mm – 0.41 kg
30 2.62˝ 2.18˝ 1.56˝ 0.550˝ 0.275˝ 1.680˝ 0.275˝ 0.045” – 1.75˝ 2.18˝ #6 4 1.15 lbs
66.7mm 55.5mm 39.7mm 13.9mm 7.0mm 42.7mm 7.0mm 1.14mm – 44.5mm 55.4mm 0.52 kg
56 3.00˝ 2.50˝ 1.81˝ 0.600˝ 0.300˝ 1.900˝ 0.300˝ 0.045” – 2.00˝ 2.50˝ #6 4 1.70 lbs
76.2mm 63.5mm 46.0mm 15.2mm 7.6mm 48.3mm 7.6mm 1.14mm – 50.8mm 63.5mm 0.77 kg
1.1 KMFD
@ 50 VDC
600 MFD
@ 50 VDC
Note ➀: Output capacitors C2and C4are required to stabilize regulators. Values can be 1MFD min. tantalum or 10MFD min. electrolytic, 20V min.
Note ➁: LM-338 is an adjustable regulator and MFR’s specifications (National Semiconductor) should be consulted for values of external components.
Note ➂: All IC’s are National Semiconductor types.
Note ➃: All bridges are EDI types
C2C4See Note ➀
C V f
VA Secondary RMS Rating
Part No. (Size) Series Parallel
LP-10-250 2 10VCT @ 250mA 5V @ 500mA
LP-10-600 6 10VCT @ 600mA 5V @ 1.2A
LP-10-1200 12 10VCT @ 1200mA 5V @ 2.4A
LP-10-2400 24 10VCT @ 2.40A 5V @ 4.80A
LP-10-4800 48 10VCT @ 4.80A 5V @ 9.60A
LP-12-200 2 12.6VCT @ 200mA 6.3V @ 400mA
LP-12-450 6 12.6VCT @ 450mA 6.3V @ 900mA
LP-12-900 12 12.6VCT @ 900mA 6.3V @ 1.8A
LP-12-1900 24 12.6VCT @ 1.90A 6.3V @ 3.80A
LP-12-3800 48 12.6VCT @ 3.80A 6.3V @ 7.60A
LP-16-150 2 16VCT @ 150mA 8V @ 300mA
LP-16-350 6 16VCT @ 350mA 8V @ 700mA
LP-16-700 12 16VCT @ 700mA 8V @ 1.4A
LP-16-1500 24 16VCT @ 1.50A 8V @ 3.00A
LP-16-3000 48 16VCT @ 3.00A 8V @ 6.00A
LP-20-125 2 20VCT @ 125mA 10V @ 250mA
LP-20-300 6 20VCT @ 300mA 10V @ 600mA
LP-20-600 12 20VCT @ 600mA 10V @ 1.2A
LP-20-1200 24 20VCT @ 1.20A 10V @ 2.40A
LP-20-2400 48 20VCT @ 2.40A 10V @ 4.80A
LP-24-100 2 24VCT @ 100mA 12V @ 200mA
LP-24-250 6 24VCT @ 250mA 12V @ 500mA
LP-24-500 12 24VCT @ 500mA 12V @ 1A
LP-24-1000 24 24VCT @ 1.00A 12V @ 2.00A
LP-24-2000 48 24VCT @ 2.00A 12V @ 4.00A
LP-30-85 2 30VCT @ 85mA 15V @ 170mA
LP-30-200 6 30VCT @ 200mA 15V @ 400mA
LP-30-400 12 30VCT @ 400mA 15V @ 800mA
LP-30-800 24 30VCT @ 800mA 15V @ 1.60A
LP-30-1600 48 30VCT @ 1.60A 15V @ 3.20A
LP-34-75 2 34VCT @ 75mA 17V @ 150mA
LP-34-170 6 34VCT @ 170mA 17V @ 340mA
LP-34-340 12 34VCT @ 340mA 17V @ 680mA
LP-34-700 24 34VCT @ 700mA 17V @ 1.40A
LP-34-1400 48 34VCT @ 1.40A 17V @ 2.80A
LP-40-60 2 40VCT @ 60mA 20V @ 120mA
LP-40-150 6 40VCT @ 150mA 20V @ 300mA
LP-40-300 12 40VCT @ 300mA 20V @ 600mA
LP-40-600 24 40VCT @ 600mA 20V @ 1.20A
LP-40-1200 48 40VCT @ 1.20A 20V @ 2.40A
LP-56-45 2 56VCT @ 45mA 28V @ 90mA
LP-56-100 6 56VCT @ 100mA 28V @ 200mA
LP-56-200 12 56VCT @ 200mA 28V @ 400mA
LP-56-425 24 56VCT @ 425mA 28V @ 850mA
LP-56-850 48 56VCT @ 850mA 28V @ 1.70A
LP-88-28 2 88VCT @ 28mA 44V @ 56mA
LP-88-65 6 88VCT @ 65mA 44V @ 130mA
LP-88-130 12 88VCT @ 130mA 44V @ 260mA
LP-120-20 2 120VCT @ 20mA 60V @ 40mA
LP-120-50 6 120VCT @ 50mA 60V @ 100mA
LP-120-100 12 120VCT @ 100mA 60V @ 200mA
LP-230-10 2 230VCT @ 10mA 115V @ 20mA
LP-230-25 6 230VCT @ 25mA 115V @ 50mA
LP-230-50 12 230VCT @ 50mA 115V @ 100mA
15
Flathead™ Low Profile Transformers
Printed Circuit Mount
If you don’t see a specific part that meets your requirement, see page 31 for our custom magnetics design data sheet.
For Low Power and Critical Height Applications
Signal’s LP transformers use hum-bucking (semi toroidal)
construction that minimizes radiated magnetic fields.
These transformers are ideal for critical low height pc
board applications.
General Specifications
■Power – 2 VA to 48 VA
■Dielectric Strength – 1500VRMS Hipot
■Primaries – Dual primaries (115V / 230V - 50/60 Hz)
■Secondaries – Series or parallel secondaries
■Electrostatic Shield – Not necessary, split bobbin construction
■Magnetic Field – Reduced magnetic radiation
■Height – .65 to 1.375 inches high
■Insulation – Class B insulation (130°C)
Agency Standards
■UL recognized to UL 506 (File #E63829)
■CSA certified to C22.2 #66 (File #LR 51265)
Signal Transformer
SM
CALL: 516-239-5777 • FAX: (24hrs) 516-239-7208
500 Bayview Avenue, Inwood, New York 11096
VA (Size) A B C L W H N D P Wgt
21.600˝ 0.375˝ 0.375˝ 1.87˝ 1.56˝ 0.650˝ – .041 x .020˝ –5 oz
40.6mm 9.5mm 9.5mm 47.5mm 39.6mm 16.5mm – 1.04 x 0.51mm 0.14 kg
61.600˝ 0.375˝ 0.375˝ 1.87˝ 1.56˝ 0.850˝ – .041 x .020˝ –7 oz
40.6mm 9.5mm 9.5mm 47.5mm 39.6mm 21.6mm – 1.04 x 0.51mm 0.20 kg
12 2.000˝ 0.500˝ 0.500˝ 2.50˝ 2.00˝ 1.065˝ – .041 x .020˝ –11 oz
50.8mm 12.7mm 12.7mm 63.5mm 50.8mm 27.1mm – 1.04 x 0.51mm 0.31 kg
24 1.900˝ 0.600˝ 0.530˝ 2.87˝ 2.25˝ 1.250˝ 2.41˝ .041(SQ pin) Clearance Hole for #4 Screw 15 oz
48.3mm 15.2mm 13.5mm 72.9mm 57.2mm 31.8mm 61.2mm 1.04SQmm 0.43 kg
48 2.180˝ 0.600˝ 0.660˝ 3.12˝ 2.50˝ 1.375˝ 2.62˝ .041(SQ pin) Clearance Hole for #6 Screw 21 oz
55.4mm 15.2mm 16.8mm 79.2mm 63.5mm 34.9mm 66.5mm 1.04SQmm 0.60 kg
C V
16
Split/Tran™ Low Power Transformers
If you don’t see a specific part that meets your requirement, see page 31 for our custom magnetics design data sheet.
Printed Circuit Mount — Split Bobbin with High Isolation
Signal’s ST and DST transformers use a split bobbin that provides superior
isolation and low capacitive coupling.
General Specifications
■Power – 1.1 VA to 36 VA
■Dieletric Strength – 2500VRMS Hipot
■Primaries – Single or dual primaries (115V or 115/230V -50/60 Hz)
■Secondaries – Series or parallel secondaries
■Electrostatic Shield – Not necessary, split bobbin construction
■Insulation – Class B insulation (130°C)
■Mounting Hardware – See chart
Agency Standards
■UL recognized to UL 506 (File #E63829)
■CSA certified to C22.2 #66 (File #LR 51265)
Signal Transformer
SM
CALL: 516-239-5777 • FAX: (24hrs) 516-239-7208
500 Bayview Avenue, Inwood, New York 11096
Optional Mtg.
Size VA L W H ML A B C Screw & Nut* Wgt
2 1.1 1.37” 1.12” 1.31” — .250” .250” 1.200“ None 0.17 lbs
34.9mm 28.6mm 23.8mm — 6.4mm 6.4mm 30.5mm 0.08 kg
3 2.4 1.37“ 1.12” 1.18” — .250” .250” 1.200” None 0.25 lbs
34.9mm 28.6mm 30.1mm — 6.4mm 6.4mm 30.5mm 0.11 kg
46 1.62” 1.31” 1.31“ 1.06 .250“ .350” 1.280” 4-40 x 1.37 Nylon 0.44 lbs
41.3mm 33.3mm 33.3mm 26.9mm 6.4mm 8.9mm 32.5mm 4-40 x 34.9mm 0.20 kg
512 1.87” 1.56” 1.43” 1.25 .300” .400” 1.410” 4-40 x 1.37 Nylon 0.70 lbs
47.6mm 39.7mm 36.5mm 31.8mm 7.6mm 10.2mm 35.8mm 4-40 x 34.9mm 0.32 kg
620 2.25” 1.87” 1.43” 1.30“ .300” .400” 1.600” 4-40 x 1.37 Nylon 0.80 lbs
57.2mm 47.6mm 36.5mm 38.1mm 7.6mm 10.2mm 40.6mm 4-40 x 34.9mm 0.36 kg
736 2.62” 2.18” 1.56” † .400” .400” 1.850” † 1.1 lbs
66.7mm 55.5mm 39.7mm † 10.2mm 10.2mm 47.0mm † 0.50 kg
*Available from Signal: Part No. ST-MS (Screw) & Part No. ST-MN (Nut).
† Size 7 has 4 mtg. holes on 2.18 x 1.75 centers for a #6 screw. Need not be nylon.
Part Number Secondary RMS Rating
Single 115V Dual 115/230V
6 Pin 8 Pin Series Parallel
ST-2-10 DST-2-10 10VCT @ 0.11A 5V @ 0.22A
ST-3-10 DST-3-10 10VCT @ 0.25A 5V @ 0.5A
ST-4-10 DST-4-10 10VCT @ 0.6A 5A @ 1.2A
ST-5-10 DST-5-10 10VCT @ 1.2A 5V @ 2.4A
ST-6-10 DST-6-10 10VCT @ 2.0A 5V @ 4.0A
ST-7-10 DST-7-10 10VCT @ 3.6A 5V @ 7.2A
ST-2-12 DST-2-12 12.6VCT @ 0.09A 6.3V @ 0.18A
ST-3-12 DST-3-12 12.6VCT @ 0.2A 6.3V @ 0.4A
ST-4-12 DST-4-12 12.6VCT @ 0.5A 6.3V @ 1.0A
ST-5-12 DST-5-12 12.6VCT @ 1.0A 6.3V @ 2.0A
ST-6-12 DST-6-12 12.6VCT @ 1.6A 6.3V @ 3.2A
ST-7-12 DST-7-12 12.6VCT @ 2.85A 6.3V @ 5.7A
ST-2-16 DST-2-16 16VCT @ 0.07A 8V @ 0.14A
ST-3-16 DST-3-16 16VCT @ 0.15A 8V @ 0.3A
ST-4-16 DST-4-16 16VCT @ 0.4A 8V @ 0.8A
ST-5-16 DST-5-16 16VCT @ 0.8A 8V @ 1.6A
ST-6-16 DST-6-16 16VCT @ 1.25A 8V @ 2.5A
ST-7-16 DST-7-16 16VCT @ 2.25A 8V @ 4.5A
ST-2-20 DST-2-20 20VCT @ 0.055A 10V @ 0.11A
ST-3-20 DST-3-20 20VCT @ 0.12A 10V @ 0.24A
ST-4-20 DST-4-20 20VCT @ 0.3A 10V @ 0.6A
ST-5-20 DST-5-20 20VCT @ 0.6A 10V @ 1.2A
ST-6-20 DST-6-20 20VCT @ 1.0A 10V @ 2.0A
ST-7-20 DST-7-20 20VCT @ 1.8A 10V @ 3.6A
ST-2-24 DST-2-24 24VCT @ 0.045A 12V @ 0.09A
ST-3-24 DST-3-24 24VCT @ 0.1A 12V @ 0.2A
ST-4-24 DST-4-24 24VCT @ 0.25A 12V @ 0.5A
ST-5-24 DST-5-24 24VCT @ 0.5A 12V @ 1.0A
ST-6-24 DST-6-24 24VCT @ 0.8A 12V @ 1.6A
ST-7-24 DST-7-24 24VCT @ 1.5A 12V @ 3.0A
ST-2-28 DST-2-28 28VCT @ 0.04A 14V @ 0.08A
ST-3-28 DST-3-28 28VCT @ 0.085A 14V @ 0.17A
ST-4-28 DST-4-28 28VCT @ 0.2A 14V @ 0.4A
ST-5-28 DST-5-28 28VCT @ 0.42A 14V @ 0.84A
ST-6-28 DST-6-28 28VCT @ 0.7A 14V @ 1.4A
ST-7-28 DST-7-28 28VCT @ 1.3A 14V @ 2.6A
ST-2-36 DST-2-36 36VCT @ 0.03A 18V @ 0.06A
ST-3-36 DST-3-36 36VCT @ 0.065A 18V @ 0.13A
ST-4-36 DST-4-36 36VCT @ 0.17A 18V @ 0.34A
ST-5-36 DST-5-36 36VCT @ 0.35A 18V @ 0.7A
ST-6-36 DST-6-36 36VCT @ 0.55A 18V @ 1.1A
ST-7-36 DST-7-36 36VCT @ 1.0A 18V @ 2.0A
ST-2-48 DST-2-48 48VCT @ 0.023A 24V @ 0.046A
ST-3-48 DST-3-48 48VCT @ 0.05A 24V @ 0.1A
ST-4-48 DST-4-48 48VCT @ 0.125A 24V @ 0.25A
ST-5-48 DST-5-48 48VCT @ 0.25A 24V @ 0.5A
ST-6-48 DST-6-48 48VCT @ 0.4A 24V @ 0.8A
ST-7-48 DST-7-48 48VCT @ 0.75A 24V @ 1.5A
ST-2-56 DST-2-56 56VCT @ 0.02A 28V @ 0.04A
ST-3-56 DST-3-56 56VCT @ 0.045A 28V @ 0.09A
ST-4-56 DST-4-56 56VCT @ 0.11A 28V @ 0.22A
ST-5-56 DST-5-56 56VCT @ 0.22A 28V @ 0.44A
ST-6-56 DST-6-56 56VCT @ 0.35A 28V @ 0.7A
ST-7-56 DST-7-56 56VCT @ 0.65A 28V @ 1.3A
ST-2-120 DST-2-120 120VCT @ 0.01A 60V @ 0.02A
ST-3-120 DST-3-120 120VCT @ 0.02A 60V @ 0.04A
ST-4-120 DST-4-120 120VCT @ 0.05A 60V @ 0.1A
ST-5-120 DST-5-120 120VCT @ 0.1A 60V @ 0.2A
ST-6-120 DST-6-120 120VCT @ 0.16A 60V @ 0.32A
ST-7-120 DST-7-120 120VCT @ 0.3A 60V @ 0.6A
C V
If you don’t see a specific part that meets your requirement, see page 31 for our custom magnetics design data sheet.
Signal Transformer
CALL: 516-239-5777 • FAX: (24hrs) 516-239-7208
500 Bayview Avenue, Inwood, New York 11096
VA A-6 A-8 OPTIONAL BRACKET*
(Size) LWH
(6 Pin) (8 Pin) B Wgt No. MW MD
1.0 1.00˝ 1.37˝ 0.83˝ 0.250˝ 0.200˝ 1.230˝ 2.5 oz – – –
25.4mm 34.92mm 21.08mm 6.35mm 5.08mm 31.2mm 0.07 kg – – –
1.2 1.37˝ 1.12˝ 1.18˝ 0.312˝ 0.200˝ 1.030˝ 3 oz – – –
34.9mm 28.6mm 30.15mm 7.92mm 5.08mm 26.2mm 0.08 kg – – –
4.4 1.62˝ 1.25˝ 1.37˝ 0.400˝ 0.250˝ 1.130˝ 5 oz – – –
41.3mm 31.8mm 34.92mm 10.16mm 6.35mm 28.7mm 0.14 kg – – –
10.0 1.87˝ 1.43˝ 1.62˝ 0.400˝ 0.250˝ 1.330˝ 9 oz 10-BR 1.64˝ 1.12˝
47.6mm 36.5mm 41.27mm 10.16mm 6.35mm 38.8mm 0.23 kg 41.7mm 28.6mm
24.0 1.62˝ 2.25˝ 1.37˝ 0.400˝ 0.250˝ 2.130˝ 12 oz 24-BR 1.37˝ 2.00˝
41.3mm 57.2mm 34.93mm 10.16mm 6.35mm 54.1mm 0.34 kg 34.9mm 50.8mm
Primary 50/500 Hz Secondary RMS Rating
Single 115V Dual 115/230V VA
(6 Pin) (8 Pin) (Size) Series Parallel
PC-10-90 DPC-10-90 1.0 10VCT @ 90mA 5V @ 180mA
PC-10-120 DPC-10-120 1.2 10VCT @ 120mA 5V @ 240mA
PC-10-440 DPC-10-440 4.4 10VCT @ 440mA 5V @ 880mA
PC-10-1000 DPC-10-1000 10.0 10VCT @ 1.0A 5V @ 2.0A
PC-10-2400 DPC-10-2400 24.0 10VCT @ 2.4A 5V @ 4.8A
PC-12-70 DPC-12-70 1.0 12.6VCT @ 70mA 6.3V @ 140mA
PC-12-100 DPC-12-100 1.2 12.6VCT @ 100mA 6.3V @ 200mA
PC-12-350 DPC-12-350 4.4 12.6VCT @ 350mA 6.3V @ 700mA
PC-12-800 DPC-12-800 10.0 12.6VCT @ 800mA 6.3V @ 1.6A
PC-12-2000 DPC-12-2000 24.0 12.6VCT @ 2.0A 6.3V @ 4.0A
PC-16-55 DPC-16-55 1.0 16VCT @ 55mA 8V @110mA
PC-16-75 DPC-16-75 1.2 16VCT @ 75mA 8V @ 150mA
PC-16-260 DPC-16-260 4.4 16VCT @ 260mA 8V @ 520mA
PC-16-640 DPC-16-640 10.0 16VCT @ 640mA 8V @ 1.28A
PC-16-1500 DPC-16-1500 24.0 16VCT @ 1.50A 8V @ 3.0A
PC-20-45 DPC-20-45 1.0 20VCT @ 45mA 10V @ 90mA
PC-20-60 DPC-20-60 1.2 20VCT @ 60mA 10V @ 120mA
PC-20-220 DPC-20-220 4.4 20VCT @ 220mA 10V @ 440mA
PC-20-500 DPC-20-500 10.0 20VCT @ 500mA 10V @ 1.0A
PC-20-1200 DPC-20-1200 24.0 20VCT @ 1.20A 10V @ 2.40A
PC-24-35 DPC-24-35 1.0 24VCT @ 35mA 12V @ 70mA
PC-24-50 DPC-24-50 1.2 24VCT @ 50mA 12V @ 100mA
PC-24-180 DPC-24-180 4.4 24VCT @ 180mA 12V @ 360mA
PC-24-450 DPC-24-450 10.0 24VCT @ 450mA 12V @ 900mA
PC-24-1000 DPC-24-1000 24.0 24VCT @ 1.0A 12V @ 2.0A
PC-28-30 DPC-28-30 1.0 28VCT @ 30mA 14V @ 60mA
PC-28-40 DPC-28-40 1.2 28VCT @ 40mA 14V @ 80mA
PC-28-160 DPC-28-160 4.4 28VCT @ 160mA 14V @ 320mA
PC-28-360 DPC-28-360 10.0 28VCT @ 360mA 14V @ 720mA
PC-28-800 DPC-28-800 24.0 28VCT @ 800mA 14V @ 1.60A
PC-34-25 DPC-34-25 1.0 34VCT @ 25mA 17V @ 50mA
PC-34-35 DPC-34-35 1.2 34VCT @ 35mA 17V @ 70mA
PC-34-125 DPC-34-125 4.4 34VCT @ 125mA 17V @ 250mA
PC-34-300 DPC-34-300 10.0 34VCT @ 300mA 17V @ 600mA
PC-34-700 DPC-34-700 24.0 34VCT @ 700mA 17V @ 1.40A
PC-40-20 DPC-40-20 1.0 40VCT @ 20mA 20V @ 40mA
PC-40-30 DPC-40-30 1.2 40VCT @ 30mA 20V @ 60mA
PC-40-110 DPC-40-110 4.4 40VCT @ 110mA 20V @ 220mA
PC-40-250 DPC-40-250 10.0 40VCT @ 250mA 20V @ 500mA
PC-40-600 DPC-40-600 24.0 40VCT @ 600mA 20V @ 1.20A
PC-56-15 DPC-56-15 1.0 56VCT @ 15mA 28V @ 30mA
PC-56-20 DPC-56-20 1.2 56VCT @ 20mA 28V @ 40mA
PC-56-80 DPC-56-80 4.4 56VCT @ 80mA 28V @ 160mA
PC-56-180 DPC-56-180 10.0 56VCT @ 180mA 28V @ 360mA
PC-56-420 DPC-58-420 24.0 56VCT @ 420mA 28V @ 840mA
PC-120-8 DPC-120-8 1.0 120VCT @ 8mA 60V @ 16mA
PC-120-10 DPC-120-10 1.2 120VCT @ 10mA 60V @ 20mA
PC-120-35 DPC-120-35 4.4 120VCT @ 35mA 60V @ 70mA
PC-120-85 DPC-120-85 10.0 120VCT @ 85mA 60V @ 170mA
17
Printed Circuit Power Transformers
Printed Circuit Mount
Miniature Low Power Transformers
Signal’s PC low power transformers are designed to
operate between 50 and 500 Hz without any degradation
in output voltage.
General Specifications
■Power – 1.0 VA to 24 VA
■Dielectric Strength – 1500VRMS Hipot
■Primaries – Single or dual primaries (115V or 115/230V - 50-500 Hz)
■Secondaries – Series or parallel secondaries
■Insulation – Class B insulation (130°C)
■Mounting Brackets – See chart
Agency Standards
■UL recognized to UL 506 (File #E63829)
■CSA certified to C22.2 #66 (File #LR 51265)
See Table on page 38 for method of determining RMS secondary current ratings.
*An optional “Slide On” Mounting Bracket is available for sizes 10 & 24. The brackets do not use up any extra “Floor Space” but add 1/32˝ to the height of the transformer.
C V
SM
Part Number
Primary 50/60 Hz DC Output Suggested Components
115V 115/230V
(8 Pin) (10) Pin Regulator I Regulator II Size C1C2C3C4D1(2) D2(4) IC1*1C
2
*
MPC-X-12 DMPC-X-12 5 VDC 360mA ±12 VDC 60mA X 2100MFD 2.7MFD 250MFD 10MFD 1N4001 1N4002 LM341P-5.0 LM326N
30V 20V 50V 20V
MPC-X-15 DMPC-X-15 5 VDC 360mA ±15 VDC 50mA X 2100MFD 2.7MFD 250MFD 10MFD 1N4001 1N4002 LM341P-5.0 LM325N
30V 20V 50V 20V
MPC-Y-12 DMPC-Y-12 5 VDC 835mA ±12 VDC 150mA Y 4000MFD 2.7MFD 1000MFD 2.7MFD 1N4001 1N4002 LM340K-5.0 LM326N
20V 20V 50V 20V
MPC-Y-15 DMPC-Y-15 5 VDC 835mA ±15 VDC 130mA Y 4000MFD 2.7MFD 1000MFD 2.7MFD 1N4001 1N4002 LM340K-5.0 LM325N
20V 20V 50V 20V
18
Printed Circuit Triple Output Transformers
Printed Circuit Mount
If you don’t see a specific part that meets your requirement, see page 31 for our custom magnetics design data sheet.
For 5 VDC and ±12 VDC or ±15 VDC Regulated Power Supplies
Signal’s MPC, DMPC and MPL transformer series have all of the performance
features of our PC and LP series.
MPC and DMPC Series
General Specifications
■Power – 10 VA and 24 VA
■Dielectric Strength – 1500VRMS Hipot
■Primaries – Single or dual primaries (115V or 115/230V nominal - 50-500 Hz)
Input range (100V to 130V or 200V to 260V - 50/60 Hz)
■Secondaries – Dual complimentary outputs (5 VDC with ±12 VDC or 5 VDC with ±15 VDC)
■Insulation – Class B insulation (130°C)
■Brackets – Available for 10 & 24 VA sizes (PN 10-BR & 24-BR)
Agency Standards
■UL recognized to UL 506 (File #E63829)
■CSA certified to C22.2 #66 (File #LR 51265)
Signal Transformer
SM
CALL: 516-239-5777 • FAX: (24hrs) 516-239-7208
500 Bayview Avenue, Inwood, New York 11096
MPC & DMPC TYPES
*National Semiconductor
LWH
A-8 A-10 B Wgt Optional Bracket
(Size) (8 Pin) (10 Pin) No. MW MD
X1.87˝ 1.43˝ 1.62˝ .250˝ .200˝ 1.300˝ .56 lbs 10-BR 1.64˝ 1.12˝
47.6mm 36.5mm 41.3mm 6.4mm 5.1mm 33.0mm .25 kg 41.6mm 28.6mm
Y1.62˝ 2.25˝ 1.37˝ .250˝ .200˝ 2.100˝ .75 lbs 24-BR 1.37˝ 2.00
41.3mm 57.2mm 34.9mm 6.4mm 5.1mm 53.3mm .34 kg 34.9mm 50.8mm
C V
VA LWHABCWgt
(Size)
61.87˝ 1.56˝ 0.850˝ 1.600˝ 0.375˝ 0.187˝ 0.43 lbs
47.6mm 39.7mm 21.6mm 40.6mm 9.5mm 4.7mm 0.20 kg
12 2.50˝ 2.00˝ 1.065˝ 2.000˝ 0.500˝ 0.250˝ 0.68 lbs
63.5mm 50.8mm 27.1mm 50.8mm 12.7mm 6.4mm 0.31kg
19
Printed Circuit Triple Output Transformers
Low Profile Printed Circuit Mount
If you don’t see a specific part that meets your requirement, see page 31 for our custom magnetics design data sheet.
Signal Transformer
SM
CALL: 516-239-5777 • FAX: (24hrs) 516-239-7208
500 Bayview Avenue, Inwood, New York 11096
For 5 VDC and ±12 VDC or ±15 VDC Regulated Power Supplies
MPL TYPES (Dual 115/230V Primary is Standard)
*National Semiconductor
MPL Series
General Specifications
■Power – 6 VA and 12 VA
■Dielectric Strength – 1500VRMS Hipot
■Primaries – Dual primaries (115/230V nominal - 50/60 Hz)
Input range (100V to 130V or 200V to 260V - 50/60 Hz)
■Secondaries – Dual complimentary outputs (5 VDC with ±12 VDC or 5 VDC with ±15 VDC)
■Electrostatic Shield – Not necessary, split bobbin construction
■Magnetic Field – Reduced magnetic riadiation
■Height – .85 and 1.065 inches high
■Insulation – Class B insulation (130°C)
Agency Standards
■UL recognized to UL 506 (File #E63829)
■CSA certified to C22.2 #66 (File #LR 51265)
Part Number
Primary 50/60 Hz DC Output Suggested Components
VA
Regulator I Regulator II (Size) C1C2C3C4D1(2) D2(4) IC1*1C
2
*
MPL-6-12 5 VDC 135mA ±12 VDC 40mA 6 1000MFD 2.7MFD 150MFD 10MFD 1N4001 1N4002 LM342P-5.0 LM326N
20V 20V 50V 20V
MPL-6-15 5 VDC 135mA ±15 VDC 35mA 6 1000MFD 2.7MFD 150MFD 10MFD 1N4001 1N4002 LM342P-5.0 LM325N
20V 20V 50V 20V
MPL-12-12 5 VDC 270mA ±12 VDC 85mA 12 2100MFD 2.7MFD 250MFD 10MFD 1N4001 1N4002 LM341P-5.0 LM326N
30V 20V 50V 20V
MPL-12-15 5 VDC 270mA ±15 VDC 70mA 12 2100MFD 2.7MFD 250MFD 10MFD 1N4001 1N4002 LM341P-5.0 LM325N
30V 20V 50V 20V
C V
20
Class 2 Transformers
Printed Circuit
If you don’t see a specific part that meets your requirement, see page 31 for our custom magnetics design data sheet.
Signal Transformer
SM
CALL: 516-239-5777 • FAX: (24hrs) 516-239-7208
500 Bayview Avenue, Inwood, New York 11096
Dimensions Sq. Pin Mtg. Dim. Mtg. Screw
WgtVA Dimension
(Size) LWHA B C M N P Size Qty
2.5 1.62˝ 1.31˝ 1.12˝ .200˝ .250˝ 1.000˝ 0.025” 1.06˝ – – #4 2 0.25 lbs
41.3mm 33.3mm 28.6mm 5.1mm 6.4mm 25.4mm 0.64mm 26.9mm – – 0.11 kg
5.0 1.62˝ 1.31˝ 1.37˝ .200˝ .400˝ 1.000˝ 0.025” 1.06˝ – – #4 2 0.37 lbs
41.3mm 33.3mm 34.9mm 5.1mm 10.2mm 25.4mm 0.64mm 26.9mm – – 0.17 kg
10.0 1.87˝ 1.56˝ 1.37˝ .200˝ .400˝ 1.140˝ 0.038” 1.25˝ – – #4 2 0.53 lbs
47.6mm 39.7mm 34.9mm 5.1mm 10.2mm 29.0mm 0.97mm 31.8mm – – 0.24 kg
20.0 2.25˝ 1.87˝ 1.62˝ .400˝ .400˝ 1.460˝ 0.038” 1.50˝ – – #4 2 0.90 lbs
57.2mm 47.6mm 41.3mm 10.2mm 10.2mm 37.1mm 0.97mm 38.1mm – – 0.41 kg
30.0 2.62˝ 2.18˝ 1.56˝ .550˝ .275˝ 1.680˝ 0.405” – 1.75˝ 2.18˝ #6 4 1.15 lbs
66.7mm 55.5mm 39.7mm 14.0mm 7.0mm 42.7mm 1.14mm – 44.5mm 55.5mm 0.52 kg
50.0 3.00˝ 2.50˝ 1.81˝ .600˝ .300˝ 1.900˝ 0.405” – 2.00˝ 2.50˝ #6 4 1.70 lbs
76.2mm 63.5mm 46.0mm 15.2mm 7.6mm 48.3mm 1.14mm – 50.8mm 63.5mm 0.77 kg
Part No. Secondary Secondary
RMS Rating Fuse Reqd.
CL2-2.5-12 12V @ .20A N/A*
CL2-2.5-24 24V @ .10A N/A*
CL2-5.0-12 12V @ .42A N/A*
CL2-5.0-24 24V @ .20A N/A*
CL2-10-12 12V @ .83A N/A*
CL2-10-24 24V @ .42A N/A*
CL2-20-12 12V @ 1.66A N/A*
CL2-20-24 24V @ .833A N/A*
CL2-30-12 12V @ 2.50A 3.0A**
CL2-30-24 24V @ 1.25A N/A*
CL2-50-12 12V @ 4.20A 5.0A**
CL2-50-24 24V @ 2.10A 2.5A**
Signal’s CL2 transformers are available in printed circuit and chassis mount
versions. They are supplied as inherently or non-inherently limited units that
are UL 1585 recognized.
General Specifications
■Power – 2.5 VA to 50 VA
■Dielectric Strength – 4000VRMS Hipot
■Primaries – Dual primaries (115/230V - 50/60 Hz)
■Secondary – Single secondary
■Class 2 Rating – Inherently or non-inherently limited
See secondary fuse requirements in tables below
■Electrostatic Shield – Not necessary, split or dual bobbin construction
■Insulation – Class F insulation (155°C)
■Flammability Rating – Bobbin and shroud material meet UL 94V0
Agency Standards
■UL recognized to UL 1585 Class 2 (File #E116583)
* Inherently limited
** Non-inherently limited
Maximum secondary fuse value specified
All primaries are 115/230 volt 50/60 Hz
V
Inherently or Non-inherently Limited
21
Class 2 Transformers
Chassis Mount
If you don’t see a specific part that meets your requirement, see page 31 for our custom magnetics design data sheet.
Signal Transformer
SM
CALL: 516-239-5777 • FAX: (24hrs) 516-239-7208
500 Bayview Avenue, Inwood, New York 11096
Dimensions
Terminals Mtg. Mtg. Dim. Mtg. WgtVA
(Size) LWHA B C Style ML MW Screw
25 2.81˝ 1.87˝ 2.31˝ 2.00˝ 1.12˝ .31˝ .187” C2.37˝ —#6
1.25 lbs
71.4mm 47.6mm 58.7mm 50.8mm 28.6mm 7.92 4.75mm 60.3mm — 0.57kg
40 3.12˝ 2.06˝ 2.68˝ 2.25˝ 1.12˝ .31˝ .187” C2.81˝ —#6
1.6 lbs
79.4mm 57.3mm 68.2mm 5.72mm 28.6mm 7.92mm 4.75mm 71.4mm 0.73 kg
80 2.50˝ 2.37˝ 3.00˝ — 1.37˝ .31˝ .187” B2.00˝ 2.18˝ #6 2.8 lbs
63.5mm 60.3mm 76.2mm — 34.9mm 7.92mm 4.75mm 50.8mm 55.5mm 1.27 kg
Part No. Secondary Secondary
RMS Rating Fuse Reqd.
CL2-25-12 12V @ 2.10A 2.5A**
CL2-25-24 24V @ 1.05A N/A*
CL2-40-12 12V @ 3.33A 4.0A**
CL2-40-24 24V @ 1.66A 2.0A**
CL2-80-24 24V @ 3.33A 4.0A**
Signal’s CL2 transformers are available in printed circuit and chassis mount
versions. They are supplied as inherently or non-inherently limited units that
are UL 1585 recognized.
General Specifications
■Power – 25 VA to 80 VA
■Dielectric Strength – 4000VRMS Hipot
■Primaries – Dual primaries (115/230V - 50/60 Hz)
■Secondary – Single secondary
■Class 2 Rating – Inherently or non-inherently limited
See secondary fuse requirements in tables below
■Electrostatic Shield – Not necessary, split or dual bobbin construction
■Terminals – Solder lug / quick-connect type terminals
■Insulation – Class F insulation (155°C)
■Flammability Rating – Bobbin and shroud material meet UL 94V0
Agency Standards
■UL recognized to UL 1585 Class 2 (File #E116583)
* Inherently limited
** Non-inherently limited
Maximum secondary fuse value specified
All primaries are 115/230 volt 50/60 Hz
V
Inherently or Non-inherently Limited
22
Two-4-One™ Power Transformers
Chassis Mount
If you don’t see a specific part that meets your requirement, see page 31 for our custom magnetics design data sheet.
Split Bobbin with High Isolation
Signal’s 241 transformers use a split bobbin that provides superior isolation
and low capacitive coupling.
General Specifications
■Power – 2.4 VA to 100 VA
■Dielectric Strength – 2500VRMS Hipot
■Primaries – Single or dual primaries (115V or 115/230V - 50/60 Hz)
■Secondary – Single center tapped secondary
■Electrostatic Shield – Not necessary, split bobbin construction
■Terminals – Solder lug / quick-connect type terminals
■Insulation – Class B insulation (130°C)
Agency Standards
■UL recognized to UL 506 (File #E63829)
■CSA certified to C22.2 #66 (File #LR 51265)
Signal Transformer
SM
CALL: 516-239-5777 • FAX: (24hrs) 516-239-7208
500 Bayview Avenue, Inwood, New York 11096
See page 38 for method of determining RMS secondary current ratings.
Dimensions
Size VA L W H A B ML Wgt
3 2.4 2.06˝ 1.06˝ 1.18˝ 1.62˝ 0.56˝ 1.75˝ 0.25 lbs
52.3mm 26.9mm 30.1mm 41.3mm 14.3mm 44.5mm 0.11 kg
46
2.37˝ 1.25˝ 1.37˝ 1.68˝ 0.68˝ 2.00˝ 0.44 lbs
60.3mm 31.8mm 34.9mm 42.8mm 17.4mm 50.8mm 0.20 kg
512
2.81˝ 1.37˝ 1.62˝ 1.93˝ 0.81˝ 2.37˝ 0.7 lbs
71.4mm 34.9mm 41.3mm 49.2mm 20.6mm 60.3mm 0.32 kg
630
3.25˝ 1.68˝ 1.93˝ 2.31˝ 1.06˝ 2.81˝ 1.1 lbs
82.6mm 42.8mm 49.2mm 58.7mm 26.9mm 71.4mm 0.50 kg
756
3.68˝ 1.81˝ 2.25˝ 2.68˝ 1.06˝ 3.12˝ 1.7 lbs
93.7mm 46.0mm 57.2mm 68.2mm 26.9mm 79.4mm 0.77 kg
8 100 4.03˝ 2.25˝ 2.56˝ 3.06˝ 1.31˝ 3.50˝ 2.75 lbs
102.4mm 57.2mm 65.1mm 77.7mm 33.3mm 90.5mm 1.25 kg
C V
Part Number Secondary Part Number Secondary
Single 115V Dual 115/230V RMS Rating Single 115V Dual 115/230V RMS Rating
241-3-10 Not Available 10VCT @ 0.25A 241-3-28 Not Available 28VCT @ 0.085A
241-4-10 DP-241-4-10 10VCT @ 0.60A 241-4-28 DP-241-4-28 28VCT @ 0.20A
241-5-10 DP-241-5-10 10VCT @ 1.2A 241-5-28 DP-241-5-28 28VCT @ 0.42A
241-6-10 DP-241-6-10 10VCT @ 3.0A 241-6-28 DP-241-6-28 28VCT @ 1.1A
241-7-10 DP-241-7-10 10VCT @ 5.0A 241-7-28 DP-241-7-28 28VCT @ 2.0A
241-8-10 DP-241-8-10 10VCT @ 10A 241-8-28 DP-241-8-28 28VCT @ 3.6A
241-3-12 Not Available 12.6VCT @ 0.20A 241-3-36 Not Available 36VCT @ 0.065A
241-4-12 DP-241-4-12 12.6VCT @ 0.50A 241-4-36 DP-241-4-36 36VCT @ 0.17A
241-5-12 DP-241-5-12 12.6VCT @ 1.0A 241-5-36 DP-241-5-36 36VCT @ 0.35A
241-6-12 DP-241-6-12 12.6VCT @ 2.5A 241-6-36 DP-241-6-36 36VCT @ 0.85A
241-7-12 DP-241-7-12 12.6VCT @ 4.0A 241-7-36 DP-241-7-36 36VCT @ 1.5A
241-8-12 DP-241-8-12 12.6VCT @ 8.0A 241-8-36 DP-241-8-36 36VCT @ 2.8A
241-3-16 Not Available 16VCT @ 0.15A 241-3-48 Not Available 48VCT @ 0.05A
241-4-16 DP-241-4-16 16VCT @ 0.40A 241-4-48 DP-241-4-48 48VCT @ 0.125A
241-5-16 DP-241-5-16 16VCT @ 0.80A 241-5-48 DP-241-5-48 48VCT @ 0.25A
241-6-16 DP-241-6-16 16VCT @ 2.0A 241-6-48 DP-241-6-48 48VCT @ 0.63A
241-7-16 DP-241-7-16 16VCT @ 3.5A 241-7-48 DP-241-7-48 48VCT @ 1.2A
241-8-16 DP-241-8-16 16VCT @ 6.25A 241-8-48 DP-241-8-48 48VCT @ 2.0A
241-3-20 Not Available 20VCT @ 0.12A 241-3-56 Not Available 56VCT @ 0.045A
241-4-20 DP-241-4-20 20VCT @ 0.30A 241-4-56 DP-241-4-56 56VCT @ 0.11A
241-5-20 DP-241-5-20 20VCT @ 0.60A 241-5-56 DP-241-5-56 56VCT @ 0.22A
241-6-20 DP-241-6-20 20VCT @ 1.5A 241-6-56 DP-241-6-56 56VCT @ 0.54A
241-7-20 DP-241-7-20 20VCT @ 2.8A 241-7-56 DP-241-7-56 56VCT @ 1.00A
241-8-20 DP-241-8-20 20VCT @ 5.0A 241-8-56 DP-241-8-56 56VCT @ 1.8A
241-3-24 Not Available 24VCT @ 0.10A 241-3-120 Not Available 120VCT @ 0.02A
241-4-24 DP-241-4-24 24VCT @ 0.25A 241-4-120 DP-241-4-120 120VCT @ 0.05A
241-5-24 DP-241-5-24 24VCT @ 0.50A 241-5-120 DP-241-5-120 120VCT @ 0.10A
241-6-24 DP-241-6-24 24VCT @ 1.25A 241-6-120 DP-241-6-120 120VCT @ 0.25A
241-7-24 DP-241-7-24 24VCT @ 2.4A 241-7-120 DP-241-7-120 120VCT @ 0.50A
241-8-24 DP-241-8-24 24VCT @ 4.0A 241-8-120 DP-241-8-120 120VCT @ 0.85A
Dimensions
VA (Size) L W H A B ML Wgt
63.25˝ 1.75˝ 1.93˝ 2.31˝ 1.06˝ 2.81˝ 1.1 lbs
82.6mm 31.8mm 49.2mm 58.7mm 26.9mm 71.4mm 0.50 kg
73.68˝ 1.81˝ 2.25˝ 2.68˝ 1.06˝ 3.12˝ 1.7 lbs
93.6mm 46.0mm 57.2mm 68.2mm 26.9mm 79.4mm 0.77 kg
84.03˝ 2.25˝ 2.56˝ 3.06˝ 1.31˝ 3.56˝ 2.75 lbs
102.4mm 57.2mm 65.1mm 77.7mm 33.3mm 90.5mm 1.25 kg
23
Two-4-One™ Triple Output
Transformers • Chassis Mount
If you don’t see a specific part that meets your requirement, see page 31 for our custom magnetics design data sheet.
For 5 VDC and ±12 VDC or ±15 VDC Regulated Power Supplies
Signal’s MT and DMT transformers have all of the performance features
of our 241 series.
General Specifications
■Power – 30 VA, 56 VA, and 100 VA
■Dielectric Strength – 2500VRMS Hipot
■Primaries – Single or dual primaries (115V or 115/230V nominal - 50/60Hz)
Input range (100V to 130V or 200V to 260V - 50/60 Hz)
■Secondaries – Dual complimentary outputs (5 VDC with ±12 VDC or 5 VDC with ±15 VDC
■Electrostatic Shield – Not necessary, split bobbin construction
■Terminals – Solder lug / quick-connect type terminals
■Insulation – Class B insulation (130°C)
Agency Standards
■UL recognized to UL 506 (File #E63829)
■CSA certified to C22.2 #66 (File # LR 51265)
Signal Transformer
SM
CALL: 516-239-5777 • FAX: (24hrs) 516-239-7208
500 Bayview Avenue, Inwood, New York 11096
C2C4See Note ➀
Note ➀: Output capacitors C2and C4are required to stablize regulators. Values can be 1MFD min. tantalum or 10MFD min. electrolytic, 20 V min.
Note ➁: LM-338 is an adjustable regulator and MFR’s specifications (National Semiconductor) should be consulted for values of external components.
Note ➂: All IC’s are National Semiconductor types.
Note ➃: All diodes are Motorola types.
Part Number
Primary 50/60 Hz DC Output Size Suggested Components
115V 115/230V Regulator I Regulator II C1C31C1➂IC2➂IC3➂D1➃D2➃
MT-6-12 DMT-6-12 5V @ 1.75A ±12V @ 210mA 6 10 KMFD 1.5 KMFD LM-323K-5 LM-340K-12 LM-320K-12 3N253 3N247
MT-6-15 DMT-6-15 5V @ 1.75A ±15V @ 175mA 6 @ 20 VDC @ 50 VDC LM-323K-5 LM-340K-15 LM-320K-15 3N253 3N247
MT-7-12 DMT-7-12 5V @ 2.8A ±12V @ 350mA 7 15 KMFD 2 KMFD LM-323K-5 LM-340K-12 LM-320K-12 MDA-400 3N247
MT-7-15 DMT-7-15 5V @ 2.8A ±15V @ 280mA 7 @ 20 VDC @ 50 VDC LM-323K-5 LM-340K-15 LM-320K-15 MDA-400 3N247
MT-8-12 DMT-8-12 5V @ 4A ±12V @ 600mA 8 26 KMFD 3.1 KMFD LM-338➁LM-340K-12 LM-320K-12 MDA-800 3N247
MT-8-15 DMT-8-15 5V @ 4A ±15V @ 500mA 8 @ 20 VDC @ 50 VDC LM-338➁LM-340K-15 LM-320K-15 MDA-800 3N247
C V
24
Conventional Rectifier Power
Transformers • Chassis Mount
If you don’t see a specific part that meets your requirement, see page 31 for our custom magnetics design data sheet.
Signal Transformer
CALL: 516-239-5777 • FAX: (24hrs) 516-239-7208
500 Bayview Avenue, Inwood, New York 11096
∆Available with dual primary only. Therefore, prefix “DL” is not required.
‡ Nominal 115V primary has added taps, I.E., 105/115/125V; Dual (DL) version is 115/230V only.
See page 38 for determining RMS secondary current ratings.
*Items are not normally in stock. They are standard designs
generally available in 3-4 weeks.
Primary 50/60 HZ Secondary RMS Rating
Single Dual* Series Parallel Mtg. LWHMLMW
Mtg. Wgt
115V 115/230V Style Screw
10-1 DL-10-1 10VCT @ 1A 5VCT @ 2A C 2.87˝ 1.75˝ 2.31˝ 2.37˝ – #8 1.0 lbs
73.0mm 44.5mm 58.7mm 60.3mm – .45 kg
10-2 DL-10-2 10VCT @ 2A 5VCT @ 4A C 3.12˝ 2.12˝ 2.75˝ 2.81˝ – #8 1.5 lbs
79.4mm 53.9mm 69.9mm 71.4mm – .68 kg
10-4 DL-10-4 10VCT @ 4A 5VCT @ 8A C 3.56˝ 2.37˝ 3.06˝ 3.12˝ – #8 2.3 lbs
90.5mm 60.3mm 77.7mm 79.4mm – 1.04 kg
10-6 DL-10-6 10VCT @ 6A 5VCT @ 12A B 3.37˝ 2.75˝ 2.81˝ 2.81˝ 2.12˝ #8 3.3 lbs
85.7mm 69.9mm 71.4mm 71.4mm 53.9mm 1.50 kg
10-8 DL-10-8 10VCT @ 8A 5VCT @ 16A B 3.37˝ 3.12˝ 2.81˝ 2.81˝ 2.50˝ #8 4.0 lbs
85.7mm 79.4mm 71.4mm 71.4mm 63.5mm 1.81 kg
10-12 DL-10-12 10VCT @ 12A 5VCT @ 24A B 3.75˝ 3.25˝ 3.12˝ 3.12˝ 2.50˝ #8 5.0 lbs
95.3mm 82.6mm 79.4mm 79.4mm 63.5mm 2.27 kg
10-25 DL-10-25 10VCT @ 25A 5VCT @ 50A B 4.50˝ 3.75˝ 3.75˝ 3.75˝ 2.75˝ #10 8.7 lbs
114.3mm 95.3mm 95.3mm 95.3mm 69.9mm 3.95 kg
10-50‡ DL-10-50 10VCT @ 50A 5VCT @ 100A B 5.25˝ 5.50˝ 4.37˝ 4.37˝ 3.62˝ 1/4 17.0 lbs
133.4mm 139.7mm 111.1mm 111.1mm 92.1mm 7.71 kg
10-100‡ DL-10-100 10VCT @ 100A 5VCT @ 200A B 6.37˝ 7.25˝ 5.31˝ 5.31˝ 4.37˝ 1/4 34.5 lbs
162.0mm 184.2mm 134.9mm 134.9mm 111.1mm 15.65 kg
12.8-1 DL-12.8-1 12.8VCT @ 1A 6.4VCT @ 2A C 2.87˝ 2.00˝ 2.31˝ 2.37˝ – #8 1.2 lbs
73.0mm 50.8mm 58.7mm 60.3mm – .54 kg
12.8-2 DL-12.8-2 12.8VCT @ 2A 6.4VCT @ 4A B 3.00˝ 2.50˝ 2.50˝ 2.50˝ 2.00˝ #8 2.3 lbs
76.2mm 63.5mm 63.5mm 63.5mm 50.8mm 1.04 kg
12.8-4 DL-12.8-4 12.8VCT @ 4A 6.4VCT @ 8A B 3.00˝ 2.87˝ 2.50˝ 2.50˝ 2.37˝ #8 2.8 lbs
76.2mm 73.0mm 63.5mm 63.5mm 60.3mm 1.27 kg
12.8-6 DL-12.8-6 12.8VCT @ 6A 6.4VCT @ 12A B 3.37˝ 3.06˝ 2.81˝ 2.81˝ 2.50˝ #8 4.0 lbs
85.7mm 77.7mm 71.4mm 71.4mm 63.5mm 1.81 kg
12.8-8 DL-12.8-8 12.8VCT @ 8A 6.4VCT @ 16A B 3.75˝ 3.12˝ 3.12˝ 3.12˝ 2.25˝ #8 4.5 lbs
95.3mm 79.4mm 79.4mm 79.4mm 57.2mm 2.04 kg
12.8-12 DL-12.8-12 12.8VCT @ 12A 6.4VCT @ 24A B 4.12˝ 3.25˝ 3.43˝ 3.43˝ 2.37˝ #10 6.0 lbs
104.8mm 82.6mm 87.3mm 87.3mm 60.3mm 2.72 kg
12.8-25 DL-12.8-25 12.8VCT @ 25A 6.4VCT @ 50A B 5.25˝ 4.25˝ 4.37˝ 4.37˝ 2.87˝ #10 12.5 lbs
133.4mm 108.0mm 111.1mm 111.1mm 73.0mm 5.69 kg
12.8-50‡ DL-12.8-50 12.8VCT @ 50A 6.4VCT @ 100A B 5.25˝ 6.00˝ 4.37˝ 4.37˝ 4.12˝ 1/4 20.7 lbs
133.4mm 152.4mm 111.1mm 111.1mm 104.8mm 9.39 kg
12.8-100‡ DL-12.8-100 12.8VCT @ 100A 6.4VCT @ 200A B 6.37˝ 7.25˝ 5.31˝ 5.31˝ 4.37˝ 1/4 34.5 lbs
162.0mm 184.2mm 134.9mm 134.9mm 111.1mm 15.65 kg
16-1 DL-16-1 16VCT @ 1A 8VCT @ 2A C 2.87˝ 2.00˝ 2.31˝ 2.37˝ – #8 1.2 lbs
73.0mm 50.8mm 58.7mm 60.3mm – .54 kg
16-2 DL-16-2 16VCT @ 2A 8VCT @ 4A C 3.12˝ 2.25˝ 2.75˝ 2.81˝ – #8 1.7 lbs
79.4mm 57.2mm 69.9mm 71.4mm – .77 kg
16-4 DL-16-4 16VCT @ 4A 8VCT @ 8A B 3.37˝ 2.75˝ 2.81˝ 2.81˝ 2.12˝ #8 3.3 lbs
85.7mm 69.9mm 71.4mm 71.4mm 53.9mm 1.50 kg
16-6 DL-16-6 16VCT @ 6A 8VCT @ 12A B 3.75˝ 3.12˝ 3.12˝ 3.12˝ 2.25˝ #10 4.5 lbs
95.3mm 79.4mm 79.4mm 79.4mm 57.2mm 2.04 kg
16-8 DL-16-8 16VCT @ 8A 8VCT @ 16A B 3.75˝ 3.50˝ 3.12˝ 3.12˝ 2.62˝ #10 5.4 lbs
95.3mm 89.0mm 79.4mm 79.4mm 66.7mm 2.45 kg
16-12 DL-16-12 16VCT @ 12A 8VCT @ 24A B 4.12˝ 3.87˝ 3.43˝ 3.43˝ 3.00˝ #10 7.9 lbs
104.8mm 98.4mm 87.3mm 87.3mm 76.2mm 3.58 kg
16-25 DL-16-25 16VCT @ 25A 8VCT @ 50A B 4.50˝ 5.37˝ 3.75˝ 3.75˝ 4.00˝ #10 14.5 lbs
114.3mm 136.5mm 95.3mm 95.3mm 101.6mm 6.58 kg
16-50‡ DL-16-50 16VCT @ 50A 8VCT @ 100A B 6.37˝ 5.70˝ 5.31˝ 5.31˝ 3.75˝ 1/4 26.5 lbs
162.0mm 146.1mm 134.9mm 134.9mm 95.3mm 12.02 kg
16-100‡ DL-16-100 16VCT @ 100A 8VCT @ 200A B 7.50˝ 7.50˝ 6.37˝ 6.75˝ 4.62˝ 1/4 50.0 lbs
190.5mm 190.5mm 162.0mm 171.5mm 117.5mm 22.68 kg
Signal’s Rectifier Power transformers provide a wide variety of outputs.
This series of conservatively designed transformers are manufactured
using traditional materials and layer wound techniques.
General Specifications
■Power – 10 VA to 2800 VA
■Dielectric Strength – 1500VRMS Hipot
■Primaries – Single, tapped, or dual primaries (105V, 115V, 125V, 230V - 50-500 Hz)
■Secondaries – Center-tapped series or center-tapped parallel secondaries
■Insulation – Class A insulation (105°C)
SM
25
Conventional Rectifier Power
Transformers • Chassis Mount (continued)
If you don’t see a specific part that meets your requirement, see page 31 for our custom magnetics design data sheet.
Signal Transformer
SM
CALL: 516-239-5777 • FAX: (24hrs) 516-239-7208
500 Bayview Avenue, Inwood, New York 11096
∆Available with dual primary only. Therefore, prefix “DL” is not required.
‡ Nominal 115V primary has added taps, I.E., 105/115/125V; Dual (DL) version is 115/230V only.
See page 38 for determining RMS secondary current ratings.
*Items are not normally in stock. They are standard designs
generally available in 3-4 weeks.
Primary 50/60 HZ Second RMS Rating
Single Dual* Series Parallel Mtg. LWHMLMW
Mtg. Wgt
115V 115/230V Style Screw
24-1 DL-24-1 24VCT @ 1A 12VCT @ 2A B 3.00˝ 2.50˝ 2.50˝ 2.50˝ 2.00˝ #8 2.3 lbs
76.2mm 63.5mm 63.5mm 63.5mm 50.8mm 1.04 kg
24-2 DL-24-2 24VCT @ 2A 12VCT @ 4A B 3.00˝ 2.87˝ 2.50˝ 2.50˝ 2.37˝ #8 2.9 lbs
76.2mm 73.0mm 63.5mm 63.5mm 60.3mm 1.32 kg
24-4 DL-24-4 24VCT @ 4A 12VCT @ 8A B 3.75˝ 3.12˝ 3.12˝ 3.12˝ 2.25˝ #8 4.5 lbs
95.3mm 79.4mm 79.4mm 79.4mm 57.2mm 2.04 kg
24-6 DL-24-6 24VCT @ 6A 12V.C.T. @ 12A B 4.12˝ 3.25˝ 3.43˝ 3.43˝ 2.37˝ #10 5.8 lbs
104.8mm 82.6mm 87.3mm 87.3mm 60.3mm 2.63 kg
24-8 DL-24-8 24VCT @ 8A 12VCT @ 16A B 4.12˝ 3.87˝ 3.43˝ 3.43˝ 3.00˝ #10 7.9 lbs
104.8mm 98.4mm 87.3mm 87.3mm 76.2mm 3.58 kg
24-12‡ DL-24-12 24VCT @ 12A 12VCT @ 24A B 4.50˝ 4.50˝ 3.75˝ 3.75˝ 3.37˝ #10 11.0 lbs
114.3mm 114.3mm 95.3mm 95.3mm 85.7mm 4.99 kg
24-20‡ DL-24-20 24VCT @ 20A 12VCT @ 40A B 5.25˝ 4.75˝ 4.37˝ 4.37˝ 3.37˝ 1/4 15.3 lbs
133.4mm 120.7mm 111.1mm 111.1mm 85.7mm 6.95 kg
24-25‡ DL-24-25 24VCT @ 25A 12VCT @ 50A B 5.25˝ 5.62˝ 4.37˝ 4.37˝ 4.12˝ 1/4 19.5 lbs
133.4mm 142.9mm 111.1mm 111.1mm 104.8mm 8.85 kg
24-50‡ DL-24-50 24VCT @ 50A 12VCT @ 100A B 6.37˝ 6.25˝ 5.31˝ 5.31˝ 4.37˝ 1/4 31.3 lbs
162.0mm 158.8mm 134.9mm 134.9mm 111.1mm 14.20 kg
— 24-100∆24VCT @ 100A 12VCT @ 200A B 7.50˝ 7.00˝ 6.37˝ 6.37˝ 4.12˝ 1/4 43.0 lbs
190.5mm 177.8mm 162.0mm 162.0mm 104.8mm 19.5 kg
36-1 DL-36-1 36VCT @ 1A 18VCT @ 2A B 3.00˝ 2.75˝ 2.50˝ 2.50˝ 2.25˝ #8 2.6 lbs
76.2mm 69.9mm 63.5mm 63.5mm 57.2mm 1.18 kg
36-2 DL-36-2 36VCT @ 2A 18VCT @ 4A B 3.37˝ 2.93˝ 2.81˝ 2.81˝ 2.37˝ #8 3.8 lbs
85.7mm 74.6mm 71.4mm 71.4mm 60.3mm 1.72 kg
36-4 DL-36-4 36VCT @ 4A 18VCT @ 8A B 4.12˝ 3.37˝ 3.43˝ 3.43˝ 2.62˝ #10 6.8 lbs
104.8mm 85.7mm 87.3mm 87.3mm 66.7mm 3.08 kg
36-6 DL-36-6 36VCT @ 6A 18VCT @ 12A B 4.50˝ 3.75˝ 3.75˝ 3.75˝ 2.75˝ #10 8.7 lbs
114.3mm 95.3mm 95.3mm 95.3mm 69.9mm 3.95 kg
36-8‡ DL-36-8 36VCT @ 8A 18VCT @ 16A B 4.50˝ 4.50˝ 3.75˝ 3.75˝ 3.37˝ #10 11.0 lbs
114.3mm 114.3mm 95.3mm 95.3mm 85.7mm 4.99 kg
36-12‡ DL-36-12 36VCT @ 12A 18VCT @ 24A B 5.25˝ 5.00˝ 4.37˝ 4.37˝ 3.37˝ 1/4 15.0 lbs
133.4mm 127.0mm 111.1mm 111.1mm 85.7mm 6.80 kg
36-20‡ DL-36-20 36VCT @ 20A 18VCT @ 40A B 6.37˝ 5.37˝ 5.31˝ 5.31˝ 3.37˝ 1/4 22.8 lbs
162.0mm 136.5mm 134.9mm 134.9mm 85.7mm 10.34 kg
36-25‡ DL-36-25 36VCT @ 25A 18VCT @ 50A B 6.37˝ 5.75˝ 5.31˝ 5.31˝ 3.75˝ 1/4 26.5 lbs
162.0mm 146.1mm 134.9mm 134.9mm 95.3mm 12.02 kg
36-30‡ DL-36-30 36VCT @ 30A 18VCT @ 60A B 6.37˝ 6.00˝ 5.31˝ 5.31˝ 4.37˝ 1/4 31.5 lbs
162.0mm 152.4mm 134.9mm 134.9mm 111.1mm 14.28 kg
— 36-50∆36VCT @ 50A 18VCT @ 100A B 6.37˝ 7.25˝ 5.31˝ 5.31˝ 5.12˝ 1/4 40.0 lbs
162.0mm 184.2m 134.9mm 134.9mm 130.2mm 18.14 kg
26
Conventional Rectifier Power
Transformers • Chassis Mount (continued)
If you don’t see a specific part that meets your requirement, see page 31 for our custom magnetics design data sheet.
Signal Transformer
SM
CALL: 516-239-5777 • FAX: (24hrs) 516-239-7208
500 Bayview Avenue, Inwood, New York 11096
Primary 50/60 HZ Second RMS Rating
Single Dual* Series Parallel Mtg. LWHMLMW
Mtg. Wgt
115V 115/230V Style Screw
56-1 DL-56-1 56VCT @ 1A 28VCT @ 2A B 3.37˝ 2.87˝ 2.81˝ 2.81˝ 2.25˝ #8 3.5 lbs
85.7mm 73.0mm 71.4mm 71.4mm 57.2mm 1.59 kg
56-2 DL-56-2 56VCT @ 2A 28 VCT @ 4A B 3.75˝ 3.25˝ 3.12˝ 3.12˝ 2.50˝ #8 5.0 lbs
95.3mm 82.6mm 79.4mm 79.4mm 63.5mm 2.27 kg
56-4 DL-56-4 56VCT @ 4A 28VCT @ 8A B 4.12˝ 3.75˝ 3.43˝ 3.43˝ 3.00˝ #10 7.7 lbs
104.8mm 95.3mm 87.3mm 87.3mm 76.2mm 3.49 kg
56-6 DL-56-6 56VCT @ 6A 28VCT @ 12A B 5.25˝ 4.25˝ 4.37˝ 4.37˝ 2.87˝ #10 12.0 lbs
133.4mm 108.0mm 111.1mm 111.1mm 73.0mm 5.44 kg
56-8‡ DL-56-8 56VCT @ 8A 28VCT @ 16A B 5.25˝ 5.00˝ 4.37˝ 4.37 3.62˝ #1/4 17.0 lbs
133.4mm 127.0mm 111.1mm 111.1mm 92.1mm 7.71 kg
56-12‡ DL-56-12 56VCT @ 12A 28VCT @ 24A B 6.37˝ 5.25˝ 5.31˝ 5.31˝ 3.37˝ 1/4 22.0 lbs
162.0mm 133.4mm 134.9mm 134.9mm 85.7mm 9.98 kg
56-25‡ DL-56-25 56VCT @ 25A 28VCT @ 50A B 6.37˝ 7.12˝ 5.31˝ 5.31˝ 5.12˝ 1/4 38.0 lbs
162.0mm 181.0mm 134.9mm 134.9mm 130.2mm 17.24 kg
— 56-50∆56VCT @ 50A 28VCT @ 100A B 7.50˝ 7.50˝ 6.24˝ 6.75˝ 4.87˝ 1/4 56.3 lbs
190.5mm 190.5mm 158.8mm 171.5mm 123.8mm 25.54 kg
68-1 DL-68-1 68VCT @ 1A 34VCT @ 2A B 3.37˝ 2.93˝ 2.81˝ 2.81˝ 2.37˝ #8 3.8 lbs
85.7mm 74.6mm 71.4mm 71.4mm 60.3mm 1.72 kg
68-2 DL-68-2 68VCT @ 2A 34VCT @ 4A B 4.12˝ 3.37˝ 3.43˝ 3.43˝ 2.62˝ #10 6.8 lbs
104.8mm 85.7mm 87.3mm 87.3mm 66.7mm 3.08 kg
68-4 DL-68-4 68VCT @ 4A 34VCT @ 8A B 4.50˝ 4.50˝ 3.75˝ 3.75˝ 3.37˝ #10 11.5 lbs
114.3mm 114.3mm 95.3mm 95.3mm 85.7mm 5.22 kg
68-6‡ DL-68-6 68VCT @ 6A 34VCT @ 12A B 5.25˝ 5.00˝ 4.37˝ 4.37˝ 3.37˝ 1/4 15.0 lbs
133.4mm 127.0mm 111.1mm 111.1mm 85.7mm 6.80 kg
68-8‡ DL-68-8 68VCT @ 8A 34VCT @ 16A B 5.25˝ 5.50˝ 4.37˝ 4.37˝ 3.87˝ 1/4 19.0 lbs
133.4mm 139.7mm 111.1mm 111.1mm 98.4mm 8.62 kg
68-12‡ DL-68-12 68VCT @ 12A 34VCT @ 24A B 6.37˝ 5.75˝ 5.31˝ 5.31˝ 3.75˝ 1/4 26.5 lbs
162.0mm 146.1mm 134.9mm 134.9mm 95.3mm 12.02 kg
— 68-25∆68VCT @ 25A 34VCT @ 50A B 6.37˝ 7.25˝ 5.31˝ 5.31˝ 5.12˝ 1/4 39.7 lbs
162.0mm 184.2mm 134.9mm 134.9mm 130.2mm 18.01 kg
80-1 DL-80-1 80VCT @ 1A 40VCT @ 2A B 3.37˝ 3.06˝ 2.81˝ 2.81˝ 2.50˝ #8 4.0 lbs
85.7mm 77.7mm 71.4mm 71.4mm 63.5mm 1.81 kg
80-2 DL-80-2 80VCT @ 2A 40VCT @ 4A B 4.12˝ 3.37˝ 3.43˝ 3.43˝ 2.62˝ #10 6.8 lbs
104.8mm 85.7mm 87.3mm 87.3 mm 66.7mm 3.08 kg
80-4 DL-80-4 80VCT @ 4A 40VCT @ 8A B 5.25˝ 4.25˝ 4.37˝ 4.37˝ 2.87˝ 1/4 12.3 lbs
133.4mm 108.0mm 111.1mm 111.1mm 73.0mm 5.58 kg
80-6‡ DL-80-6 80VCT @ 6A 40VCT @ 12A B 5.25˝ 5.50˝ 4.37˝ 4.37˝ 3.87˝ 1/4 19.0 lbs
133.4mm 139.7mm 111.1mm 111.1mm 98.4mm 8.62 kg
80-8‡ DL-80-8 80VCT @ 8A 40VCT @ 16A B 6.37˝ 5.25˝ 5.31˝ 5.31˝ 3.25˝ 1/4 20.5 lbs
162.0mm 133.4mm 134.9mm 134.9mm 82.6mm 9.30 kg
80-12‡ DL-80-12 80VCT @ 12A 40VCT @ 24A B 6.37˝ 6.00˝ 5.31˝ 5.31˝ 4.12˝ 1/4 29.0 lbs
162.0mm 152.4mm 134.9mm 134.9mm 104.8mm 13.15 kg
— 80-25∆80VCT @ 25A 40VCT @ 50A B 7.50˝ 6.50˝ 6.25˝ 6.75˝ 3.87˝ 1/4 40.3 lbs
190.5mm 165.1mm 158.8mm 171.5mm 98.4mm 18.28 kg
∆Available with dual primary only. Therefore, prefix “DL” is not required.
‡ Nominal 115V primary has added taps, I.E., 105/115/125V; Dual (DL) version is 115/230V only.
See page 38 for determining RMS secondary current ratings.
*Items are not normally in stock. They are standard designs
generally available in 3-4 weeks.
Part No. Inductance Current Resistance Mtg. LWHMLMW
Mtg. Wgt
(MHY) (Amps) (Ohms) Style Screw
CH-1 100 1 1.5 B 3.00˝ 2.50˝ 2.50˝ 2.50˝ 2.00˝ #8 2.3 lbs
76.2mm 63.5mm 63.5mm 63.5mm 50.8mm 1.04 kg
CH-2 70 2 0.9 B 3.37˝ 2.75˝ 2.87˝ 2.81˝ 2.12˝ #8 3.2 lbs
85.7mm 69.9mm 73.0mm 71.4mm 53.9mm 1.45 kg
CH-4 70 4 0.6 B 3.75˝ 3.12˝ 3.25˝ 3.12˝ 2.50˝ #8 5.3 lbs
95.3mm 79.4mm 82.6mm 79.4mm 63.5mm 2.40 kg
CH-6 40 6 0.4 B 3.75˝ 3.62˝ 3.25˝ 3.12˝ 3.00˝ #8 6.5 lbs
95.3mm 92.1mm 82.6mm 79.4mm 76.2mm 2.95 kg
CH-8 30 8 0.3 B 4.12˝ 3.62˝ 3.50˝ 3.43˝ 3.00˝ #10 8 lbs
104.8mm 92.1mm 88.9mm 87.3mm 76.2mm 3.63 kg
CH-12 15 12 0.1 B 5.25˝ 4.00˝ 4.43˝ 4.37˝ 3.12˝ #10 13.7lbs
133.4mm 101.6mm 112.7mm 111.1mm 79.4mm 6.21 kg
CH-16 15 16 0.08 B 5.25˝ 4.62˝ 4.43˝ 4.37˝ 3.62˝ #10 17.5 lbs
133.4mm 117.5mm 112.7mm 111.1mm 92.0mm 7.94 kg
CH-20 7 20 0.05 B 5.25˝` 4.00˝ 4.43˝ 4.37˝ 3.12˝ #10 13.3 lbs
133.4mm 101.6mm 112.7mm 111.1mm 98.4mm 6.03 kg
CH-25 5 25 0.025 B 5.25˝ 4.75˝ 4.43˝ 4.37˝ 3.87˝ #10 17.8 lbs
133.4mm 120.7mm 112.7mm 111.1mm 98.4mm 8.07 kg
CH-30 4 30 0.01 B 6.37˝ 5.00˝ 5.37˝ 5.31˝ 3.37˝ 1/4 24.4 lbs
161.9mm 127.0mm 136.5mm 134.9mm 85.7mm 11.07 kg
CH-50 1.4 50 0.01 B 6.37˝ 5.25˝ 5.37˝ 5.31˝ 3.75˝ 1/4 26.7 lbs
161.9mm 133.4mm 136.5mm 134.9mm 95.3mm 12.11 kg
CH-100 0.5 100 0.005 B 6.37˝ 6.25˝ 5.37˝ 5.31˝ 4.12˝ 1/4 31.4 lbs
161.9mm 158.8mm 136.5mm 134.9mm 104.8mm 14.24 kg
CH-200 0.3 200 0.001 B 7.50˝ 7.50˝ 6.25˝ 6.75˝ 4.12˝ 1/4 48.0 lbs
190.5mm 190.5mm 158.8mm 171.5mm 104.8mm 21.77 kg
27
Filter and Dual Chokes
Chassis Mount
If you don’t see a specific part that meets your requirement, see page 31 for our custom magnetics design data sheet.
Available in Single and Dual Windings
Signal’s CH and CL chokes are designed to compliment the rectifier power
transformers so that a set may be specified for DC power supplies using inductive filters.
General Specifications
■Inductance – 0.12 MHY to 100 MHY
■DC Current – 1.0 ADC to 200 ADC
■Insulation – Class A insulation (105°C)
Signal Transformer
SM
CALL: 516-239-5777 • FAX: (24hrs) 516-239-7208
500 Bayview Avenue, Inwood, New York 11096
Signal’s Dual Chokes are supplied with 2 windings which may be series or parallel connected with rating shown on chart. This line is basically designed
for application requiring lower inductance value at high currents, such as low voltage, DC supplies or SCR filters.
See page 38 for determining RMS secondary current ratings.
Part No.
Series Connected Parallel Connected Mtg. Dimensions Mtg. Wgt
Ind. Curr. Res. Ind. Curr. Res. L W H ML MW Screw
(MHY) (Amps) Ω(MHY) (Amps) ΩStyle
CL-1-2 72 1 1.4 18 2 0.35 C 2.87˝ 1.75˝ 2.31˝ 2.37˝ —#8
0.9 lbs
73.0mm 44.5mm 58.7mm 60.3mm 0.41 kg
CL-2-4 40 2 0.7 10 4 0.18 C 3.12˝ 2.12˝ 2.75˝ 2.81˝ —#8
1.5 lbs
79.4mm 53.9mm 69.9mm 71.4mm 0.68 kg
CL-4-8 20 4 0.3 5 8 0.075 B 3.00˝ 2.87˝ 2.50˝ 2.50˝ 2.50˝ #8 3.0 lbs
76.2mm 73.0mm 63.5mm 63.5mm 63.5mm 1.36 kg
CL-6-12 12 6 0.15 3 12 0.038 B 3.37˝ 3.06˝ 2.81˝ 2.81˝ 2.50˝ #8 4.0 lbs
85.7mm 77.7mm 71.4mm 71.4mm 63.5mm 1.81 kg
CL-12-24 4.8 12 0.052 1.2 24 0.013 B 3.37˝ 3.56˝ 2.81˝ 2.81˝ 3.00˝ #8 5.3 lbs
85.7mm 90.5mm 71.4mm 71.4mm 76.2mm 2.40 kg
CL-25-50 1.2 25 0.012 0.3 50 0.003 B 3.75˝ 3.37˝ 3.37˝ 3.12˝ 2.75˝ #8 6.0 lbs
98.3mm 85.7mm 85.7mm 79.4mm 69.9mm 2.72 kg
CL-50-100 0.5 50 0.0043 0.12 100 0.0011 B 4.50˝ 3.75˝ 3.75˝ 3.75˝ 2.50˝ #8 8.0 lbs
114.3mm 95.3mm 95.3mm 95.3mm 63.5mm 3.63 kg
28
Power Isolation Transformers
If you don’t see a specific part that meets your requirement, see page 31 for our custom magnetics design data sheet.
Industrial Grade Step-Up or Step-Down Transformers
Signal’s DU and SU transformers have been designed to provide a multitude
of step-up or step-down voltages to accommodate the various input voltages
available throughout the world.
General Specifications
■Power – 250 VA to 10 KVA (500 VA to 20 KVA possible if used as auto-transformer)
■Dielectric Strength – 2500VRMS Hipot
■Primaries – Dual/tapped primaries: Parallel connected (104V, 110V, 120V - 50-500 Hz)
Series connected (208V, 220V, 230V, 240V - 50-500 Hz)
■Secondaries – Dual/tapped secondaries: DU Series
Parallel connected (104V, 110V, 120V - 50-500 Hz)
Series connected (208V, 220V, 230V, 240V - 50-500 Hz)
■Electrostatic Shield – 2 mil thick copper foil connected to ground. The connection may be opened
if an ungrounded shield is desired.
■Terminals – Plated brass screw type terminals
■Insulation – Class A insulation (105°C)
Signal Transformer
SM
CALL: 516-239-5777 • FAX: (24hrs) 516-239-7208
500 Bayview Avenue, Inwood, New York 11096
Series Secondaries Parallel Secondaries Mechanical Dimensions Mtg. &
Part No. KVA Volts Max. Volts Max. L W H ML MW Term. Wgt
Amps Amps ***†‡Screw
DU-1/4 1/4 0/208/220/240 1.1 0/104/110/120 2.2 5.31˝ 4.25˝ 5.25˝ 4.37˝ 2.50˝ #10 12 lbs
134.9mm 107.9mm 133.4mm 111.1mm 63.5mm 5.44 kg
DU-1/2 1/2 0/208/220/240 2.3 0/104/110/120 4.6 5.31˝ 5.31˝ 5.25˝ 4.37˝ 3.62˝ #10 18 lbs
134.9mm 134.9mm 133.4mm 111.1mm 92.1mm 8.16 kg
DU-1 1 0/208/220/240 4.5 0/104/110/120 9 7.56˝ 6.25˝ 7.37˝ 6.75˝ 4.12˝ 1/4 33 lbs
192.1mm 158.8mm 187.3mm 171.5mm 104.8mm 14.97 kg
DU-2 2 0/208/220/240 9 0/104/110/120 18 7.56˝ 8.25˝ 7.37˝ 6.75˝ 6.00˝ 1/4 56 lbs
192.1mm 209.6mm 187.3mm 171.5mm 152.4mm 25.40 kg
DU-3 3 0/208/220/240 14 0/104/110/120 28 7.56˝ 9.25˝ 7.37˝ 6.75˝ 7.00˝ 1/4 70 lbs
192.1mm 234.9mm 187.3mm 171.5mm 177.8mm 31.75 kg
DU-5 5 0/208/220/240 23 0/104/110/120 46 7.56˝ 10.75˝ 7.37˝ 6.75˝ 8.50˝ 1/4 89 lbs
192.1mm 273.1mm 187.3mm 171.5mm 215.9mm 40.37 kg
DU-7.5 7.5 0/208/220/240 31 0/104/110/120 62 9.00˝ 10.75˝ 8.00˝ 7.50˝ 6.50˝ 1/4 105 lbs
228.6mm 273.1mm 203.2mm 190.5mm 165.1mm 47.63 kg
DU-10 10 0/208/220/240 41 0/104/110/120 82 9.00˝ 13.00˝ 8.00˝ 7.50˝ 9.00 1/4 150 lbs
228.6mm 330.2mm 203.2mm 190.5mm 228.6mm 68.04 kg
*Maximum † ± 0.6˝ (1.6mm) ‡ ± .12˝ (3.2mm)
As shown on the schematic diagram the “DU” line is designed with dual primaries and secondaries. All four windings are identically rated at 0/104/110/120 volts. This permits series or parallel connections
on either primary or secondary. Therefore, a nominal 110 to 110 volt, 220 to 220 volt,110 to 220 volt, or 220 to 110 volt transformer can be set up. The winding taps permit intermediate series ratings
such as 208, 214, or 230 volts. It is also possible to make auto-transformer connections by connecting a primary group in series with a secondary group. Such nominal ratings as 440 to 220 volts or 220
to 440 volts can be set up, in addition to the standard ratings described above. A further advantage to auto-transformer connection is the fact that the KVA rating of a particular type is doubled.
29
Power Isolation Transformers
If you don’t see a specific part that meets your requirement, see page 31 for our custom magnetics design data sheet.
Signal Transformer
SM
CALL: 516-239-5777 • FAX: (24hrs) 516-239-7208
500 Bayview Avenue, Inwood, New York 11096
Industrial Grade Step-Up or Step-Down Transformers
Signal’s DU and SU transformers have been designed to provide a multitude
of step-up or step-down voltages to accommodate the various input voltages available
throughout the world.
General Specifications
■Power – 250 VA to 10 KVA (500 VA to 20 KVA possible if used as auto-transformer)
■Dielectric Strength – 2500VRMS Hipot
■Primaries – Dual/tapped primaries: Parallel connected (104V, 110V, 120V - 50-500 Hz)
Series connected (208V, 220V, 230V, 240V - 50-500 Hz)
■Secondaries – Dual/tapped secondaries: SU Series
Parallel connected (208V, 220V, 240V - 50-500 Hz)
Series connected (416V, 440V, 460V, 480V - 50-500Hz)
■Electrostatic Shield – 2 mil thick copper foil connected to ground. The connection may be opened
if an ungrounded shield is desired.
■Terminals – Plated brass screw type terminals
■Insulation – Class A insulation (105°C)
Series Secondaries Parallel Secondaries Mechanical Dimensions Mtg. &
Part No. KVA Volts Max. Volts Max. L W H ML MW Term. Wgt
Amps Amps ***†‡Screw
SU-1/4 1/4 0/416/440/480 0.55 0/208/220/240 1.1 5.31˝ 4.25˝ 5.25˝ 4.37˝ 2.50˝ #10 12 lbs
134.9mm 107.9mm 133.4mm 111.1mm 63.5mm 5.44 kg
SU-1/2 1/2 0/416/440/480 1.15 0/208/220/240 2.3 5.31˝ 5.31˝ 5.25˝ 4.37˝ 3.62˝ #10 18 lbs
134.9mm 134.9mm 133.4mm 111.1mm 92.1mm 8.16 kg
SU-1 1 0/416/440/480 2.25 0/208/220/240 4.5 7.56˝ 6.25˝ 7.37˝ 6.75˝ 4.12˝ 1/4 33 lbs
192.1mm 158.8mm 187.3mm 171.5mm 104.8mm 14.97 kg
SU-2 2 0/416/440/480 4.5 0/208/220/240 9 7.56˝ 8.25˝ 7.37˝ 6.75˝ 6.00˝ 1/4 56 lbs
192.1mm 209.6mm 187.3mm 171.5mm 152.4mm 25.40 kg
SU-3 3 0/416/440/480 7 0/208/220/240 14 7.56˝ 9.25˝ 7.37˝ 6.75˝ 7.00˝ 1/4 70 lbs
192.1mm 234.9mm 187.3mm 171.5mm 177.8mm 31.75 kg
SU-5 5 0/416/440/480 11.5 0/208/220/240 23 7.56˝ 10.75˝ 7.37˝ 6.75˝ 8.50˝ 1/4 89 lbs
192.1mm 273.1mm 187.3mm 171.5mm 215.9mm 40.37 kg
SU-7.5 7.5 0/416/440/480 15.5 0/208/220/240 31 9.00˝ 10.75˝ 8.00˝ 7.50˝ 6.50˝ 1/4 105 lbs
228.6mm 273.1mm 203.2mm 190.5mm 165.1mm 47.63 kg
SU-10 10 0/416/440/480 20.5 0/208/220/240 41 9.00˝ 13.00˝ 8.00˝ 7.50˝ 9.00 1/4 150 lbs
228.6mm 330.2mm 203.2mm 190.5mm 228.6mm 68.04 kg
*Maximum † ± 0.6˝ (1.6mm) ‡ ± .12˝ (3.2mm)
As shown on the schematic diagram the “SU” line is designed with dual primaries and secondaries. Two primary windings are identically rated at 0/104/110/120.
Two secondary windings are identically rated at 0/208/220/240. This permits series or parallel connections on either primary or secondary. Therefore a nominal 110 to
220 volt, 220 to 440 volt, 110 to 440 volt, or 440 to 110 volt transformer can be set up. The winding tape permits intermediate series ratings such as 416, 428, and 460
volts. It is also possible to make auto-transformer connections by connecting a primary group in series with a secondary group. Such nominal ratings as 660 to 330 volts
or 330 to 660 volts can be set up, in addition to the standard ratings described above. A further advantage to auto-transformer connection is the fact that the KVA rating
of a particular type is doubled.
30
Step Down Auto Transformers
Chassis Mount
If you don’t see a specific part that meets your requirement, see page 31 for our custom magnetics design data sheet.
Available with Receptical and Line Cord or Leads
Signal’s auto transformers provide the user the capability of adapting
voltages for worldwide applications.
General Specifications
■Power – 100 VA to 2000 VA
■Voltage – EB version (230V to 115V - 50/60 Hz)
OF version (230V to 115V or 115V to 230V - 50/60 Hz)
■Connections – EB version (receptacle and 2-prong line cord)
OF version (8 inch long leads)
■Insulation – Class A insulation (105°C)
Signal Transformer
SM
CALL: 516-239-5777 • FAX: (24hrs) 516-239-7208
500 Bayview Avenue, Inwood, New York 11096
Part. No. VA (Size) Width Depth Height Mtg. Centers Wgt
110 100 1.87˝ 2.37˝ 2.50˝ 1.50 x 1.68˝ 1.5 lbs
47.6mm 60.3mm 63.5mm 38.1 x 42.8mm 0.68 kg
112 120 2.87˝ 2.12˝ 3.50˝ 2.25 x 1.75˝ 3.0 lbs
73.0mm 54.0mm 88.9mm 57.2 x 44.5mm 1.36 kg
115 150 2.87˝ 3.37˝ 3.50˝ 2.25 x 2.00˝ 3.5 lbs
73.0mm 85.7mm 88.9mm 57.2 x 50.8mm 1.59 kg
120 200 2.87˝ 3.50˝ 3.50˝ 2.25 x 2.12˝ 4.0 lbs
73.0mm 88.9mm 88.9mm 57.2 x 54.0mm 1.81 kg
125 250 2.87˝ 3.87˝ 3.50˝ 2.25 x 2.50˝ 4.8 lbs
73.0mm 98.4mm 88.9mm 57.2 x 63.5mm 2.18 kg
130 300 3.25˝ 3.87˝ 3.87˝ 2.50 x 2.43˝ 5.5 lbs
82.6mm 98.4mm 98.4mm 63.5 x 61.9mm 2.49 kg
150 500 3.25˝ 4.87˝ 3.87˝ 2.50 x 3.43˝ 8 lbs
82.6mm 123.8mm 98.4mm 63.5 x 87.3mm 3.63 kg
175 750 3.25˝ 5.87˝ 3.87˝ 2.50 x 4.43˝ 11 lbs
82.6mm 149.2mm 98.4mm 63.5 x 112.7mm 5.00 kg
1100 1000 4.50˝ 5.12˝ 5.50˝ 3.50 x 3.50˝ 14 lbs
114.3mm 130.2mm 139.7mm 88.9 x 88.9mm 6.35 kg
1150 1500 4.50˝ 6.12˝ 5.50˝ 3.50 x 4.50˝ 20 lbs
114.3mm 155.6mm 139.7mm 88.9 x 114.3mm 9.07 kg
1200 2000 4.50˝ 7.12˝ 5.50˝ 3.50 x 5.50˝ 26 lbs
114.3 mm 181.0mm 139.7mm 88.9 x 139.7mm 11.79 kg
Part. No. VA (Size) Width Depth Height Mtg. Centers Wgt
110-OF 100 2.25˝ 2.00˝ 1.93˝ 2.81˝ 1.3 lbs
57.2mm 50.8mm 49.2mm 71.4mm 0.59 kg
112-OF 120 3.37˝ 2.50˝ 2.87˝ 2.81 x 1.87˝ 2.5 lbs
85.7mm 63.5mm 73.0mm 71.4 x 47.6mm 1.13 kg
115-OF 150 3.37˝ 2.75˝ 2.87˝ 2.81 x 2.12˝ 3.0 lbs
85.7mm 69.9mm 73.0mm 71.4 x 54.0mm 1.36 kg
120-OF 200 3.37˝ 2.87˝ 2.87˝ 2.81 x 2.25˝ 3.5 lbs
85.7mm 73.0mm 73.0mm 71.4 x 57.2mm 1.59 kg
125-OF 250 3.37˝ 3.25˝ 2.87˝ 2.81 x 2.62˝ 4.2 lbs
85.7mm 82.6mm 73.0mm 71.4 x 66.7mm 1.90 kg
130-OF 300 3.75˝ 3.25˝ 3.12˝ 3.12 x 2.50˝ 5.0 lbs
95.3mm 82.6mm 79.4mm 79.4 x 63.5mm 2.27 kg
150-OF 500 3.75˝ 4.25˝ 3.12˝ 3.12 x 3.50˝ 8.0 lbs
95.3mm 107.9mm 79.4mm 79.4 x 88.9mm 3.63 kg
175-OF 750 3.75˝ 5.25˝ 3.12˝ 3.12 x 4.50˝ 11 lbs
95.3mm 133.4mm 79.4mm 79.4 x 114.3mm 5.00 kg
1100-OF 1000 5.25˝ 4.50˝ 4.37˝ 4.37 x 3.12˝ 14 lbs
133.4mm 114.3mm 111.1mm 111.1 x 79.4mm 6.35 kg
1150-OF 1500 5.25˝ 5.50˝ 4.37˝ 4.37 x 4.12˝ 19 lbs
133.4mm 139.7mm 111.1mm 111.1 x 104.8mm 8.62 kg
1200-OF 2000 5.25˝ 6.50˝ 4.37˝ 4.37 x 5.12˝ 25 lbs
133.4mm 165.1mm 111.1mm 111.1 x 130.2mm 11.34 kg
EB Version
OF Version
Custom Magnetics Design Data Sheet
Signal Transformer
Name_______________________________
Address_____________________________
_____________________________
Contact _____________________________
Phone ______________________________
Fax ________________________________
Application: Power transformer (50/60/400 Hz) _______________________________________________________
Switching mode power conversion _________________________ (Topology______________________________)
Other ________________________________________________
Frequency: ___________________________________________
Voltage(s):
Primary __________________
Secondary _______________ At current(s)________________
_______________ ________________
_______________ ________________
_______________ ________________
Above values are: AC___________ DC___________
Type of Rectification (or Secondary Loading): _________________________________________________________
Duty Cycle (0 to 100%): ___________________________________________________________________________
Dielectric Withstanding Voltage (Isolation Voltage): _____________________________________________________
Other Requirements: _____________________________________________________________________________
____________________________________________________________________________
____________________________________________________________________________
Quote Price & Delivery on Quantity of: ______________________________________________________________
Schematic:
Mechanical Requirements:
NO POSTAGE
NECESSARY
IF MAILED
IN THE
UNITED STATES
BUSINESS REPLY MAIL
FIRST CLASS MAIL PERMIT NO. 953 FAR ROCKAWAY, NY
POSTAGE WILL BE PAID BY ADDRESSEE
SIGNAL TRANSFORMER CO., INC.
500 BAYVIEW AVE.
INWOOD, NY 11096-9898
!1109698989!
ATT: CUSTOMER SERVICE
FAX TO 516-239-7208
OR FOLD AND MAIL
PLEASE FOLD THIS FLAP FIRST WHEN RETURNING CARD BY MAIL
➜
Custom Magnetics Design Data Sheet
Signal Transformer
Name_______________________________
Address_____________________________
_____________________________
Contact _____________________________
Phone ______________________________
Fax ________________________________
Application: Power transformer (50/60/400 Hz) _______________________________________________________
Switching mode power conversion _________________________ (Topology______________________________)
Other ________________________________________________
Frequency: ___________________________________________
Voltage(s):
Primary __________________
Secondary _______________ At current(s)________________
_______________ ________________
_______________ ________________
_______________ ________________
Above values are: AC___________ DC___________
Type of Rectification (or Secondary Loading): _________________________________________________________
Duty Cycle (0 to 100%): ___________________________________________________________________________
Dielectric Withstanding Voltage (Isolation Voltage): _____________________________________________________
Other Requirements: _____________________________________________________________________________
____________________________________________________________________________
____________________________________________________________________________
Quote Price & Delivery on Quantity of: ______________________________________________________________
Schematic:
Mechanical Requirements:
NO POSTAGE
NECESSARY
IF MAILED
IN THE
UNITED STATES
BUSINESS REPLY MAIL
FIRST CLASS MAIL PERMIT NO. 953 FAR ROCKAWAY, NY
POSTAGE WILL BE PAID BY ADDRESSEE
SIGNAL TRANSFORMER CO., INC.
500 BAYVIEW AVE.
INWOOD, NY 11096-9898
!1109698989!
ATT: CUSTOMER SERVICE
FAX TO 516-239-7208
OR FOLD AND MAIL
PLEASE FOLD THIS FLAP FIRST WHEN RETURNING CARD BY MAIL
➜
How to specify power transformer
& filter ratings
35
The purpose of this section is to provide a practical guide
for the selection of a power supply transformer and filter
components. A number of basic assumptions are made to
avoid an academic discussion of unnecessary material. For
those interested in a rigorous theoretical analysis, there are
a number of fine references available. Additionally, circuit
analysis using appropriate analysis software (SPICE or its
equivalent) is recommended in the rare circumstances
where a better understanding of a particular situation is
needed, or when it becomes necessary to optimize some
aspect of the design. Computer analysis is particularly
useful in understanding areas that are difficult to approach
using traditional circuit analysis methods, areas such as
capacitor RMS ripple current.
One of the more esoteric problems encountered by
the circuit designer is the selection of power transformer
ratings for a particular DC power supply. The designer is
immediately confronted with a number of rectifier circuits
and filter configurations. For the sake of simplicity, we will
make some assumptions which should be valid for 99%
of the average designer’s applications and present some
useful rules of thumb appropriate for conservative design.
Filters
We will immediately discard the consideration of choke
input filters and confine our choice to capacitor input filters
because of the following:
1. It is desirable to eliminate the weight
and cost of chokes.
2. It can be assumed that if a regulator is used it will
provide sufficient extra ripple reduction so that an L-C
section is not required. In addition, the regulator will
compensate for the poor output voltage regulation
with load, inherent in capacitor input systems.
The remaining disadvantages of the capacitive input
filter system are caused by the discontinuous secondary
current flow (high peak-to-average ratio of forward diode
current). Current is drawn in short, high amplitude pulses to
replace the charge of the filter capacitor which discharges
into the load during diode off time. This results in higher
effective RMS values of transformer secondary current.
However, the transformer average VA rating is the same as
the choke input filter because the higher DC output voltage
obtained at the capacitor compensates for this effect. In
addition, except perhaps for supplies handling very high
currents, average semiconductor diodes will meet most of
the peak or surge current requirements of capacitive filters.
Rectifier Circuit
The remaining choice is that of a rectifier circuit
configuration. The most common single phase circuits are:
1. Half-Wave (single diode)
2. Full-Wave Center-Tapped (two diodes)
3. Full-Wave Bridge (four diodes)
4. Dual Complementary Supply — “Full-Wave
Center-Tap” (four diodes)
The only advantages of the half-wave rectifier are
its simplicity and the savings in cost of one diode.
Its disadvantages are many:
1. Extremely high current spikes are drawn during the
capacitor charging interval (only one current surge
per cycle). This current is limited only by the effective
transformer and rectifier series impedance, but it must
not be too high or it will result in rectifier damage.
This short once-per-cycle current spike also results
in very high secondary RMS currents.
2. The unidirectional DC current in the transformer
secondary biases the transformer core with a
component of DC flux density. As a result, more
“iron” is needed to avoid core saturation.
About the only time it would pay to consider using the
half-wave rectifier is for very low DC power levels of about
1⁄2watt or less. At these levels a power transformer cannot
be reduced very much in size (at reasonable cost) and a
small filter capacitor will be large enough for adequate
DC smoothing.
The remaining single-phase rectifier circuits are of the
“full-wave” type. Secondary current surges occur twice
per cycle so that they are of smaller magnitude and the
fundamental ripple frequency is double the supply
frequency (i.e., 120 Hz rather than the 60 Hz of a half-wave
system). All full-wave rectifiers also have the same basic
rectified waveform applied to the filter capacitor.
Other Factors
• Full-Wave Center-Tap
Uses 1⁄2of secondary winding at a time
Requires center-tap
Uses 2 diodes
• Full-Wave Bridge
Uses full secondary winding continuously
No center-tap required
Uses 4 diodes
As can be seen above, the choice between FWCT and
Bridge configurations is a tradeoff. The bridge rectifier has
the best transformer utilization but requires the use of 4
diodes. The extra diodes result in twice the diode voltage
drop of a FWCT circuit so that the FWCT is usually
preferable in low voltage supplies.
The “dual complementary
rectifier circuit” is the
combination of two FWCT
circuits and is a very efficient
way of obtaining two identical
outputs of reversed polarity
sharing a common ground.
It is also called a “center-
tapped bridge rectifier.”
The diagram below represents a full-wave center-tapped
rectifier using a capacitive filter and is the most common
selection for moderate power, regulated DC supplies.
The following assumptions can safely be made:
1. VREG is approx-
imately 3 volts DC
or greater.
2. VRECT is about
1.25 volts DC.
3. VRIPPLE is
about 10% VDC
peak.
The following formula may be used for determining
the transformer secondary voltage:
VNOM is
VLOWLINE
the ratio of the nominal AC line voltage to the required low line conditions.
A sample illustration of the above will be shown for a
supply requiring an output of 5V DC at 2A DC to operate
down to an input voltage of 95V RMS.
VOUT = 5V
VREG = 3V
VRECT = 1.25V
VRIPPLE = 0.5 (1V p-p)
VAC = 9.75 x115 x 1 = 9.27 VAC
0.9 95 M2
Therefore, the transformer secondary voltage can be
specified as about 18 V CT. For a bridge rectifier of the
same output requirements, the only change is that:
VRECT = 2 x 1.25 = 2.5V
As a result VAC will be reformulated as:
VAC = 11 x 115 x 1 = 10.46 VAC
0.9 95 M2
so that the transformer secondary voltage
now becomes about 10.5V.
Transformer Secondary Current
The remaining step is to determine the transformer RMS
secondary circuit. This can be accurately determined only
by complex analysis. However, for practical engineering
purposes the chart below may be used.
*Even though we have dropped choke input filters from this discussion,
they are included for reference.
For instance, in our particular example (5 V, 2A
DC supply) the transformer RMS current would be:
for FWCT 1.2 x 2 = 2.4 A
for bridge 1.8 x 2 = 3.6 A
The total transformer specification would then be:
Dual Complementary Supply
One more common example will be given, i.e.,
a dual complementary supply for ± 15 V @ 100 mA DC.
VOUT = ±15 VRECT = 1.25
VREG = 3
VRIPPLE = 0.75 (1.5 V p-p)
VAC =
(15 + 3 + 1.25 + 0.75) x 115 x 1 = 19V
0.9 95 M2
1AC = 1.8 x 100 mA = 180 mA RMS
The transformer secondary rating is 38 V CT @ 180 mA
RMS. Possible Signal parts would be ST-4-36, PC-34-300,
PC-40-250. A precautionary calculation remains to be made.
That is, the increase in voltage at the filter capacitor (into the
regulator) caused by a high line condition. If we assume our
highest line voltage to be 130 V AC then the transformer
output (compared to low line) would rise by the ratio 130/95.
In the 5V supply, for instance, the following would happen:
VAC = 130 x 9.27 = 12.7V
95
In the dual complementary +15 V supply:
VAC = 130 x 19 = 26V
95
The increase in output must be absorbed by the reg-
ulator, which results in higher regulator power dissipation.
The illustrated values are safe for the typical IC regulator
but should be checked in any specific application.
Rectifier Required RMS
Type Filter Type* Secondary Current
Rating
Full-Wave Choke Input 0.7 x DC Current
Center-Tap
Full-Wave Capacitor 1.2 x DC Current
Center-Tap Input
Full-Wave Choke Input DC Current
Bridge
Full-Wave Capacitor 1.8 x DC Current
Bridge Input
36
How to specify power transformer
& filter ratings
Circuit Secondary Possible “Signal”
Rating Parts
FWCT 18.5 CT @ 2.4A 241-7-20, 36-1
RMS = 43.2 VA
bridge 10.5 @ 3.6A ST-7-10, 241-6 or
RMS = 36 VA 7-10, 10-4
Load Regulation
It has been assumed in the previous discussion of the
change in transformer secondary voltage with line voltage that
no change has been occurring in load current. Therefore, the
transformers would seem to be ideal and the transformer
secondary voltage (VAC) will always be the same. Actually,
all the voltages calculated are assumed to be full load.
Since transformers are not ideal and have an internal
impedance or “regulation” characteristic, variations in load
current may cause a problem. If the load should be “light” at
“high line,” then there will be an additional rise in secondary
voltage, beyond that due to the rising line voltage, caused
by the decreasing voltage drop in the transformer windings.
Most smaller VA transformers (<10VA) have a load
regulation of 20% or higher. This means that the trans-
former no-load voltage will be 20% or more higher than
rated full-load voltage. This must then be taken into
account in the calculation of maximum VAC (and DC
voltage into regulator) with low-load currents.
Due to the inherent design characteristics of trans-
formers, “regulation” will vary inversely with size (or VA
rating). In larger transformers size is determined primarily
by the heat generated by internal losses. In smaller trans-
formers (low VA rating) size is determined by the maximum
permissible no-load to full-load regulation. Even though this
is an important design limitation, most transformer manu-
facturers do not publish load regulation data. The chart
below tabulates load regulation for Signal standard
transformers.
It is possible to estimate the output voltage at intermediate
loads since load regulation varies in an almost linear manner.
For example, the 241-8-16 has a full-load rating of 16 V @
6.25 A and a regulation of 10%. Its no-load output would be
10% more than 16 or 17.6 V. At half-load (3.1 2 A) its output
would be 5% more than 16 or 16.8 V. Similar estimates can
be made for any % load.
Another factor to bear in mind is that it is possible to
safely exceed the VA rating
of many small power trans-
formers. If the added
regulation (drop in output
voltage) is acceptable, an
“overload” may be per-
missible because the design
is regulation-limited rather
than heat rise-limited. If such
a choice is being considered,
the decision should be
checked with our Design
Engineering department.
Temperature Rise
In power transformers over 25VA, temperature rise
becomes a factor. The transformer may be constructed
with materials capable of withstanding higher temperatures
and be a perfectly valid design. However, the extra power
dissipated may cause heating of nearby components. This
added power loss increases the total power dissipated in the
circuit area. The problem is not the internal temperature of
the transformer, but the actual increase in watts lost.
Shielding
Certain AC power line noise and transients will be fed
through to the transformer secondary because of the
capacitance between windings. This is a problem which is
very difficult to analyze. Whether or not it is a problem in a
particular applicaton can be best determined empirically.
If such feedthrough is a problem, the most common first
step is to use an electro-static shield between windings.
This effectively reduces the inter-winding capacitance.
An equal and sometimes superior approach is to choose
transformers with non-concentric windings, i.e., with pri-
mary and secondary wound side-by-side rather than one
over the other. Both result in at least order of magnitude
reductions in capacitance. The “non-concentric” approach,
however, gives superior reductions. It also results in higher
insulation resistance and makes it simpler to obtain higher
insulation test voltages.
Certain types of feedthrough cannot be much affected
by the transformer design and other approaches such
as line filters or “MOVs” or ZNR’s (transient surge
suppressors) may have to be considered.
Summary
This has been an attempt to provide a simple, practical
method of determining transformer ratings. Certain basic
assumptions have been made and this section is not meant
as a rigorous academic analysis. However, such material is
readily available in the literature (see below). This, we feel,
may help bridge the gap for the working designer.
References
For more detailed theoretical analysis
the following are recommended:
1. Reuben Lee, Electronic
Transformers & Circuits, 1947,
John Wiley & Sons
2. EE Staff – MIT, Magnetic Circuits &
Transformers, 1943,
John Wiley & Sons
3. O.H. Schade, Proc. IRE, vol 31,
p. 356, 1943
37
How to specify power transformer
& filter ratings
Signal Transformer - % Load Regulation
of Standard Transformers
Family or Series Size or VA Rating Approx. %
Regulation
2.5, 5.0, 10VA 30
14A & 14A-R 20, 30 & 56 VA 20
IF (International 2VA-18VA 21-27
Flathead) 24VA & 30VA 20
25VA 20
A41 43VA 15
80 & 130VA 10
175VA 8
MPI 200VA-900VA 4-10
HPI 2KVA-3.5KVA 2-4
M4L 3, 6, 10 8
ST & DST ST-2 30
SPLIT TRAN ST, 3, 4, 5, 6 & 7 20
PC & DPC ALL 20
2.5 & 6VA 30
LP (Flathead) 12, 24 & 48VA 20
2.4 TO 12VA
SIZES 3, 4, 5 20
241 & DP241 30 & 56VA
SIZES 6 & 7 15
100VA SIZE 8 10
1 TO 100VA 10
RECTIFIER 100 TO 350VA 8
TYPES 500VA OR 5% OR
OVER LESS
ADDITIONAL FACTORS TO BE CONSIDERED IN TRANSFORMER SELECTION
% load regulation is defined as: Vnl – Vfl x 100 %
Vfl
or the % rise in output voltage
at no load as compared to full load.
38
How to specify power transformer
& filter ratings
COMMENTS ON CAPACITOR & DIODE SELECTION
Capacitor Selection
For low current supplies (IOUT<IA) capacitor selection
is relatively straight-forward. Capacitance is found by the
simple formula:
C = 1L x 6 x 10-3
∆V
where: 1L = DC load current
∆V = peak-to-peak ripple voltage
ripple frequency = 120 Hz.
This yields 2000µ F/amp for 3V p-p ripple. At DC
currents below 1 amp, capacitor heating is usually not
a problem and peak-to-peak ripple voltage is the
determining factor in capacitor size.
At higher values of capacitance, where the ratio of
capacitor outside surface area to volume is significantly
lower, internal heating becomes a problem. Ripple current
rating may be a determining factor in capacitor selection,
rather than ripple voltage. In many cases, capacitor size will
have to be increased to prevent excessive internal heating.
Manufacturers’ data sheets should be consulted (after an
initial selection is made) to ensure that capacitor ripple
current ratings are met. Remember that the RMS ripple
current ratings shown on capacitor data sheets are not the
same as DC load current. RMS ripple current in a capacitor
input filter is 2 to 3 times the load current. In addition, the
time-to-failure used to rate capacitors on data sheets is
often 10,000 hours. For five-year life (40,000 hours),
ambient temperature may have to be derated 30°C from
the date sheet rating. Capacitor life roughly doubles
for each 15°C reduction in operating temperature. The
following calculations illustrate a typical design example:
assume 1L = 3A, ∆V = 4V p-p,
VDC = 12V
C = (6 x 10-3) (3A) = 4,500µ F
4V
Manufacturer’s rating on a 4,600µ F/20V capacitor
@ TA = 65°C is 3.1 A RMS. Dividing by 2.5 to convert from
RMS ripple current to output current yields a maximum DC
load current of 1.24 amps. Obviously either a large capacitor
is required or ambient temperature must be reduced.
As a final note, be sure to check whether the data sheet
ratings are for still or moving air. Computer grade capac-
itors are often rated only for moving air. Other types may
be rated for still air and are, therefore, actually more
conservatively rated.
Remember that capacitors are the number one cause
of power supply failure. Don’t let your supplies dominate
the statistics column!
Diode Selection
The RMS value of the current flowing into a capacitor
input filter is 2 to 3 times the DC output current because the
current is delivered in short pulses. Assuming a full-wave
center-tap or bridge, this means that although each diode is
conducting only on alternate half cycles, it should be rated
for at least the full output current. To ensure adequate
surge capability during turn-on, a diode rating of at least
twice the output current is recommended, especially for
higher current supplies where the ratio of filter capacitance
to output current is somewhat higher. Keep in mind that
axial lead diodes achieve most of their heat sinking through
the leads. Short leads soldered to large area standoffs or
printed circuit pads are definitely recommended.
For “short circuit proof” IC regulated supplies using
three-terminal regulators, an additional diode derating may
have to be used. Long-term output shorts do not harm the
regulator, which goes into a current limit or thermal limit
mode to protect itself. The diodes, however, may ex-
perience a substantial current increase during the short.
Regulator data sheets should be consulted for current limit
values, keeping in mind that current limit is a function of
input-output voltage differential. At high input voltages, the
short circuit current of IC regulators is often less than full
load current, tending to alleviate this problem.
Rectifier RMS
Type Filter Type Secondary
Current is
Full-Wave Choke Input = 0.7 x
Center-Tap DC Amps
Full-Wave Capacitor Input = 1 to 1.2 x
Center-Tap DC Amps
Full-Wave Choke Input = DC Amps
Bridge
Full-Wave Capacitor Input = 1.6 to 1.8 x
Bridge DC Amps
METHOD OF DETERMINING SECONDARY CURRENT RATINGS
The secondary currents shown in the tables are RMS ratings. Depending upon rectifier circuit
configurations, the RMS secondary current is different from the DC output current. This is indicated
in the chart below:
For example, in a F.W. Bridge circuit with a capacitive filter, if the load is 1 Amp DC, the RMS
Secondary current is 1.6 to 1.8 Amp RMS.
