Meets pulse waveform template of CCITT I.430 when
recommended transformer and chip pair are used
Excellent longitudinal balance
2kVrms isolation voltage
Available in tape and reel, tray or tube packaging
Recognized by UL
8
916
PE-6579X
Date Code
Country of Origin
.530 MAX
13,46
.720 MAX
18,29
.600
15,24
16X .030
0,76
.120 TYP
3,05
.050 TYP
1,27
.520
13,21
.760
19,30
.100 TYP
2,54 .700
17,78
.004/0,10
16 SURFACES
.010/.020
0,25/0,51
.122
3,10
.950 MAX
24,13
.100
2,54
.390 MAX
9,91
.040/.050
1,02/1,27
SUGGESTED PAD LAYOUT
16 13
1423
15 14 12 9
5867
11 10
PRI
COIL A COIL B
SEC
Dimensions: Inches
mm
Unless otherwise specified all tolerances are ±.010
0,25
Electrical Specifications @ 25°C — Operating Temperature 0°C to 70°C
Part Ratio A OCL Pri B LL Sec CW/W CD Pri DCR Pri DCR Sec IDC C Package/
Number (±2%) (mH MIN) (µH MAX) (pF MAX) (pF MAX) ( ±25%) ( ±25%) (mA MAX) Schematic
A B A & B A B A & B A B A B A B
PE-65793 1:1 1:1 22 5 5 100 42 42 2.4 2.4 2.4 2.4 1 SC-1
PE-65795 1:2 1:2 22 15 15 100 80 80 2.5 2.5 4.3 4.3 1 SC-1
Mechanical Schematic
SC-1
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China 86 755 33966678
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ISDN S-INTERFACE TRANSFORMERS
Suface Mount, Dual, 2000Vrms
Meets the pulse waveform template of CCITT I.430 when
recommended transformer and chip pair are used
Excellent longitudinal balance
2kVrms or higher voltage isolation
Recognized by UL
.558 MAX
14,20
1
2
3
6
4
PE-6499X
DATE CODE
.120 – .020
3,10 0,30
.400
10,20
.400
10,20
C
L
C
L
LEADS ARE 22 AWG SOLDERABLE
5 .558 MAX
14,20
.400 MAX
10,20
6
4
1
3
25
PRI : SEC
PRI
SEC
16 13
1423
15 14 12 9
5867
1110
COIL A COIL B
Dimensions: Inches
mm
Unless otherwise specified all tolerances are ±.010
0,25
Electrical Specifications @ 25°C — Operating Temperature 0°C to 70°C
2KV ISOLATION, THROUGH HOLE, SINGLE TRANSFORMERS
PART RATIO A OCL PRI L
L SEC C
W/W CD PRI DCR PRI DCR SEC ISOLATION IDC C PACKAGE/
NUMBER (±2%) (MH MIN) (µH MAX) (PF MAX) (PF MAX) ( ±25%) ( ±25%) (VRMS MIN) (MA MAX) SCHEMATIC
PE-64995 1CT:2CT 22 15 100 80 2.5 4.3 2000 1 IS-1
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ISDN S-INTERFACE TRANSFORMERS
Through Hole, Single & Dual, 2000Vrms
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China 86 755 33966678
Taiwan 886 3 4356768
COIL A COIL B
PART
R
ATIO A EQUIVALENT PRIMARY SECONDARY RATIO A EQUIVALENT PRIMARY SECONDARY
PACKAGE/
NUMBER
SINGLE PINS PINS SINGLE PINS PINS
SCHEMATIC
PE-65495 1:2 PE-64995 1-4 16-13 1:2 PE-64995 5-8 12-9 ID -1
Electrical Specifications @ 25°C — Operating Temperature 0°C to 70°C
Mechanical Schematic
IS -1
Mechanical Schematic
ID-1
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ISDN S-INTERFACE TRANSFORMERS
Transformer Selection & Packaging
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Taiwan 886 3 4356768
NOTES
A. In this catalog, turns ratio is expressed as “primary:secondary”. The
term “CT” designates a center tapped winding. The term “CS” des-
ignates a split center tap winding. A center tapped winding can be
created by connecting two ends of a split center winding together on
the printed circuit board. In ISDN-S applications, the primary winding
is the line side transformer winding.
B. The minimum primary inductance and the maximum distributed
capacitance satisfy the transmitter output and receiver input imped-
ance requirements of CCITT I.430 for both the TE and the NT. The
maximum distributed capacitance allows sufficient margin for the
capacitance of the IC and a protection diode network. It is consistent
with the overall maximum value specified and the permitted length of
the basic access TE cord.
C. The maximum specified unbalanced DC current capability is based on
20 mH minimum primary OCL.
D. National recommends a 1:2 receive transformer, but used as a 1:1
ratio by connecting only half the secondary winding. See National’s
application note.
E. PE-65950 and PE-65853 are recommended for use with Siemens PEB
2080/2085 and help in meeting the required longitudinal balance.
F. Standard packaging for all chokes and transformers listed in this cata-
log is anti-static tubes. Optional anti-static tray
packaging can be ordered for the surface mount SC-1 and LA-1 pack-
ages by adding an “R” suffix to the part number,
(ie: PE-65795R). Optional tape and reel packaging can be ordered for
all surface mount packages by adding a “T” suffix to the part number,
(ie: PE-65795T).
G. For PE-65854, OCL at -40°C is 27 µH minimum. For maximum perfor-
mance use windings (1-8) and (2-7) as a pair and windings (3-6) and
(4-5) as a pair.
H. For transformers and choke modules, refer to data sheet T632.
PACKAGE F TYPE PART WEIGHT PARTS/TUBE PARTS/TRAY PARTS/REEL REEL DIAMETER TAPE WIDTH PITCH
LA-1 SMT 2.0 GRAMS 30 60 250 13 INCHES 24 MM 24 MM
SC-1 SMT 7.0 GRAMS 20 50 150 13 INCHES 44 MM 24 MM
ID-1 THT 7.0 GRAMS 20 – – – – –
IS-1 THT 4.0
GRAMS 35 – – – – –
Packaging Information
IC
MANUFACTURER
IC
PART NUMBER
DUAL
SURFACE MOUNT
TX & RX
SINGLE
THROUGH HOLE, 2 KVRMS
DUAL
THROUGH HOLE
TX RX TX & RX
AT&T/LUCENT
T7903 PE-65795 PE-64995 PE-64995 PE-65495
MIETEC
MTC-2072
PE-65795 PE-64995 PE-64995 PE-65945
MITEL
MT8930
PE-65795 PE-64995 PE-64995 PE-65495
MOTOROLA
MC145474/145475
MC145574
PE-65793 — — PE-65495
NATIONAL D
TP3420/3421
PE-65795 PE-64995 PE-64995 PE-65495
SGS THOMSON
ST5420, ST5421
PE-65795 PE-64995 PE-64995 PE-65495
SIEMENS
PEB 2080/2081/2085
PSB 2186
PEB 2084/2086
PE-65795 PE-64995 PE-64995 PE-65495
YAMAHA
7405B
PE-65795 PE-64995 PE-64995 PE-65495
1. General Information – The S-interface is the
standardized four-wire digital telephone access point
defined by the CCITT I-series recommendations for the
Integrated Services Digital Network. This “basic rate
access” accommodates two 64Kbps “B-channels”
for information, one 16Kbps “D-channel” intended for
signaling and control, and 48 Kbps for framing and other
purposes, giving a total rate of 192Kbps. The CCITT
physical layer recommends that the user network
interface be transformer coupled. A typical application
circuit is presented in Figure 1.
The transformer provides isolation for the line card or the
terminal from the line. It is also a way to provide phantom
power feeding to the terminal over the S-loop. Each end
requires a transmit and a receive transformer. Chokes are
used in some applications to reduce common mode noise
(see note 5).
The transformers described in this data sheet are
matched to the transceivers offered by the major IC
manufacturers listed. The use of a transformer-chip pair
assures that all requirements of CCITT I.430 are met with
respect to pulse waveform templates, impedance and
longitudinal balance. In addition, the transformers provide
the isolation voltages required by the regulatory agencies
and are capable of passing surge voltage tests.
2. Longitudinal Balance for Transformers – The
longitudinal conversion loss specification in I.430 includes
a test setup that is intended for system evaluation,
whether TE or NT. Such a test is performed with DC
current present. The transformer plays an essential role
in achieving the required balance. However, all other
elements in the circuit should be also designed to provide
the highest possible symmetry. These elements include
the protection circuitry, series resistors, chip transmitter
output and receiver input, as well as the cables used
and the TE cord where applicable. A high level of
transformer balance compensates for some circuit
AC-unbalance, and assures compliance of the system
with I.430 on longitudinal conversion loss (LCL) and
signal balance. This is accomplished by a well AC-
balanced winding configuration whereby the capacitive
coupling between primary and secondary windings is
evenly distributed. Also, both halves of the lineside
winding are well balanced. The transformers meet the
following LCL specifications:
• 10kHz to 300kHz: 60dB minimum
• 300kHz to 1MHz: Minimum value decreasing
20dB/decade.
IC
XMIT
Sec : Pri
RCV
High
Freq
Choke
IC
RCV
XMIT
Low
Freq
Choke
Low
Freq
Choke
High
Freq
Choke
S-INTERFACE
Local
Power
DC
Supply
Pri : Sec
NTTE
Sec : Pri Pri : Sec
Figure 1. Typical ISDN S-Interface Application Circuit
(continued on next page)
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ISDN S-INTERFACETRANSFORMERS
Surface Mount, Dual, 2000Vrms
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Singapore 65 6287 8998
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China 86 755 33966678
Taiwan 886 3 4356768
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ISDN S-INTERFACETRANSFORMERS
Surface Mount, Dual, 2000Vrms
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Singapore 65 6287 8998
Shanghai 86 21 62787060
China 86 755 33966678
Taiwan 886 3 4356768
2. (continued from previous page) A recommended test
setup is shown in Figure 2. A high inductance “low
frequency” common mode choke, such as PE-65950NL
or PE-65853NL, is recommended to improve balance, or
to correct inherent unbalances of some circuits.
3. Impedance Requirements – The requirements for
minimum impedance in the inactive and powered-down
states are expressed by impedance templates for both
transmitter and receiver in NT and TE. At the low
frequency end of 1MHz, it is reasonable to assume that
the impedance seen from the line is entirely capacitive.
The maximum capacitance budget, derived from the
templates, is somewhat different for the NT and the TE.
Contributors to the total capacitance are: the chip output,
the protection circuit, the transformer, common mode
choke and any other element that may be present.
In the TE case, there is also the maximum allowable TE
cord impedance. Here the maximum budget is 800pF.
As a rule, the capacitances should be kept as low as
possible in the interface circuit design. With the specified
transformer capacitances, it is possible to remain within
budget and have a reasonable margin for measurement
errors.
4. Common Mode Chokes – The “high frequency” 4-wire
common mode chokes shown on pages 7 and 8 provide
an effective means of compliance with national and
international regulations on EMI. They are designed to be
used in conjunction with either Pulse’s ISDN S-Interface
or T1/CEPT transformers as shown in Figure 1. A high
inductance “low frequency” common mode choke is
recommended to improve balance, or to correct inherent
unbalances of some ISDN S-Interface circuits.
5. Surge Voltage Capability for Transformers and Chokes
• Longitudinal Voltage Peak: 2,400V 10/700µsec
• Metallic Voltage Peak: 800V 10/560µsec
6. Behavior Under Fault Conditions – Telephony voltages
may accidentally appear on the ISDN S-Interface line to
the transformer. The transformer will withstand a DC
current of 0.5 Amps for 15 minutes without permanent
damage. Such current may be caused by the telephone
central battery. The transformer will also survive ringing
voltages. These are nominally 120V or 200V maximum at
20 to 60Hz, limited by 1500W resistive or 400 to 600W
inductive limiting. These may cause peak currents.
7. Flammability – Materials used in the products are
recognized UL94-VO. Products meet the requirements of
IEC 695-2-2 (Needle Flame Test).
Out
HP-8751A
Network Analyzer
RBA
VT
EL
ISM-1
Pri Sec
Terminating
Resistor
ISM-1 = Wandel and Goltermann
Signal Balance Ratio Bridge
Figure 2. Longitudinal Balance Test Circuit
Designed for 4-wire links, ISDN-S/T and
T1/E1/CEPT
High frequency chokes for EMI reduction
Low frequency chokes improve
longitudinal balance in ISDN-S/T links
Surface mount and through hole models
available
0
-5
-10
-15
-20
-25
-30
Attenuation (dB)
1 MHz 10 MHz 100 MHz
Frequency
PE-65555
PE-65854
PE-65554/65857
3.0K
2.8K
2.6K
2.4K
2.2K
2.0K
1.8K
1.6K
1.4K
1.2K
1K
800
600
400
200
0
Impedance (Ω)
1 MHz 10 MHz 100 MHz
Frequency
PE-65555
PE-65554/65857
PE-65854
Typical common
mode attenuation
for high frequency
common mode
chokes based on
a 100 system.
Typical impedance
for high frequency
common mode
chokes based on
a 100 system.
20K
18K
16K
14K
12K
10K
8K
6K
4K
2K
0
Impedance (Ω)
100 KHz 1 MHz 10 MHz
Frequency
PE-65542
PE-65950/65853
PE-65541
Typical common
mode attenuation
for low frequency
common mode
chokes based on
a 100 system.
Typical impedance
for low frequency
common mode
chokes based on
a 100 system.
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China 86 755 33966678
Taiwan 886 3 4356768
Electrical Specifications @ 25°C — Operating Temperature 0°C to 70°C
Part Number OCL Pri L
L Sec CW/W DCR Isolation Package/
(µH MAX) (pF MAX) (W MAX) (Vrms MIN) Schematic
LOW FREQUENCY
PE-65541NL 6.0 mH MIN 35 25 1.40 1,500 IS-4/1C (Through Hole)
PE-65542NL 1.0 mH MIN 10 10 0.70 1,500 IS-4/1C (Through Hole)
PE-65853NL E 4.7 mH ±30% 1 60 1.20 500 PA-2/5C (Surface Mount)
PE-65950NL
E 4.7 mH ±30% 1 50 1.00 500 IS-4/1C (Through Hole)
HIGH FREQUENCY
PE-65554NL 24.0 µH MIN .20 15 0.30 500 IN-1/C (Through Hole)
PE-65555NL 8.0 µH MIN .20 10 0.25 500 IN-1/C (Through Hole)
PE-65854NL F 47.0 µH MIN .18 20 0.40 500 SH-4/C (Surface Mount)
PE-65857NL 22.5 µH MIN .23 17 0.30 500 LA-1/C (Surface Mount)
ISDN S-INTERFACE TRANSFORMERS
Common Mode Chokes for Telecom Application
s
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8765
1234
PE-XXXXX
Date Code
Country of Origin
.595 MAX
15,11
.480 MAX
12,20
.130 – .010
3,30 – 0,25
.300
7,62
.100
2,54
C
L
C
L
.300
7,62
MAX
Mechanicals1, 2
IN-1 SH-4
ISDN S-INTERFACE TRANSFORMERS
Common Mode Chokes for Telecom Application
s
IN-4 PA-2
Schematics
1
8
2
7
3
6
4
5
C
1
2
3
4
5
6
7
8
1C
LA-1
For More Information:
Pulse Worldwide
Headquarters
12220 World Trade Dr.
San Diego, CA 92128
U.S.A.
www.pulseeng.com
Tel: 858 674 8100
Fax: 858 674 8262
Pulse Europe
Einsteinstrasse 1
D-71083 Herrenberg
Germany
Tel: 49 7032 7806 0
Fax: 49 7032 7806 135
Pulse China Headquarters
B402, Shenzhen Academy of
Aerospace Technology Bldg.
10th Kejinan Rd.
High-Tech Zone
Nanshan District
Shenzen, PR China 518057
Tel: 86 755 33966678
Fax: 86 755 33966700
Pulse North China
Room 2704/2705
Super Ocean Finance Ctr.
2067 Yan An Rd. West
Shanghai 200336
China
Tel: 86 21 62787060
Fax: 86 2162786973
Pulse South Asia
135 Joo Seng Rd.
#03-02
PM Industrial Bld g.
Singapore 368363
Tel: 65 6287 8998
Fax: 65 6287 8998
Pulse North Asia
3F, No. 198
Zhongyuan Rd.
Zhongli City
Taoyuan County 320
Taiwan R. O. C.
Tel: 886 3 4356768
Fax: 886 3 4356823 (Pulse)
Fax: 886 3 4356820 (FRE)
Performance warranty of products offered on this data sheet is limited to the parameters specified. Data is subject to change without notice. Other brand and product names mentioned
herein may be trademarks or registered trademarks of their respective owners.
© Copyright, 2010. Pulse Engineering, Inc. All rights reserved.
1. Dimensions: Inches Unless otherwise specified all tolerances are ± .010
mm 0,25
2. See page 3 for packaging information.
