Ohmite Mfg. Co. 1600 Golf Rd., Suite 850, Rolling Meadows, IL 60008 • Tel. 1-866-9-OHMITE • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
Ohmite Mfg. Co. 1600 Golf Rd., Suite 850, Rolling Meadows, IL 60008 • Tel. 1-866-9-OHMITE • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
STANDARD PART NUMBERS FOR STANDARD RESISTANCE VALUES
270 Series
Vitreous Enamel
Power Resistors
L
D
C
= Most popular Standard values
= Standard values
= Non-Standard values subject to minimum handling charge per item
Dimensions (in. / mm)
L D C
Series Wattage Ohms Length Diam. I. D. Core Voltage
L12 12 0.1-51K 1.75 / 44.4 0.313 / 7.94 0.188 / 4.76 565
L25 25 0.15-100K 2.0 / 50.8 0.562 / 14.3 0.313 / 7.94 625
L50 50 0.38-260K 4.0 / 101.6 0.562 / 14.3 0.313 / 7.94 1625
L100 100 0.23-101K 6.5 / 165.1 0.750 / 19.1 0.50 / 12.7 2845
L175 175 0.13-101K 8.5 / 215.9 1.125 / 28.6 0.75 / 19.1 3595
L225 225 0.16-129K 10.5 / 266.7 1.125 / 28.6 0.75 / 19.1 4595
L500 500 0.38-218K 12.0 / 304.8 2.50 / 63.5 1.75 / 44.5 4970
L1000 1000 0.69-392K 20.0 / 508.0 2.50 / 63.5 1.75 / 44.5 8900
Shaded values involve very fine resistance wire and should not be used in critical
applications without burn-in and/or thermal cycling.
Red outlined values supplied in Silicone-Ceramic coatings instead of vitreous enamel.
Non-Inductive versions available; Other sizes available; Also available in low
cost Centohm coating; Consult Factory.
0.51 L12JKR51
1 L12J1R0
1.5 L12J1R5
2.2 L12J2R2
3.3 L12J3R3
4.7 L12J4R7
6.8 L12J6R8
10 L12J10R
12 L12J12R
15 L12J15R
18 L12J18R
22 L12J22R
27 L12J27R
33 L12J33R
39 L12J39R
47 L12J47R
56 L12J56R
68 L12J68R
82 L12J82R
100 L12J100
120 L12J120
150 L12J150
180 L12J180
220 L12J220
270 L12J270
330 L12J330
390 L12J390
1 –––1R0
2 –––2R0
3 –––3R0
4 –––4R0
5 –––5R0
10 –––10R
15 –––15R
25 –––25R
50 –––50R
75 –––75R
100 –––100
125 –––125
150 –––150
200 –––200
250 –––250
500 –––500
750 –––750
800 –––800
1,000 –––1K0
1,500 –––1K5
2,000 –––2K0
2,500 –––2K5
3,000 –––3K0
3,500 –––3K5
470 L12J470
560 L12J560
680 L12J680
820 L12J820
1000 L12J1K0
1200 L12J1K2
1500 L12J1K5
1800 L12J1K8
2200 L12J2K2
2700 L12J2K7
3300 L12J3K3
3900 L12J3K9
4700 L12J4K7
5600 L12J5K6
6800 L12J6K8
8200 L12J8K2
10000 L12J10K
12000 L12J12K
15000 L12J15K
18000 L12J18K
22000 L12J22K
27000 L12J27K
33000 L12J33K
39000 L12J39K
47000 L12J47K
51000 L12J51K
4,000 –––4K0
5,000 –––5K0
6,000 –––6K0
7,500 –––7K5
8,000 –––8K0
10,000 –––10K
12,000 –––12K
15,000 –––15K
20,000 –––20K
25,000 –––25K
30,000 –––30K
35,000 –––35K
40,000 –––40K
50,000 –––50K
60,000 –––60K
70,000 –––70K
75,000 –––75K
80,000 –––80K
100,000 –––100K
125,000 –––125K
150,000 –––150K
175,000 –––175K
200,000 –––200K
250,000 –––250K
Ohmic
value 12 Watt
Ohmic
value 12 Watt
Ohmic value
L25J––– 25
L50J––– 50
L100J––– 100
L175J––– 175
Wattage
Part No.
Prefix
Suffix
L225J––– 225
L500J––– 500
L1000J–––1000
Ohmic value
L25J––– 25
L50J––– 50
L100J––– 100
L175J––– 175
Wattage
Part No.
Prefix
Suffix
L225J––– 225
L500J––– 500
L1000J–––1000
Select 270 Type fixed resistors
for applications requiring watt-
age ratings from 12 to 1000
watts.
The 270 Type resistors are
equipped with lug terminals
suitable for soldering or sturdy
bolt connection. When secure
mounting is required, the hol-
low core of these resistors
permit fastening with spring-
type brackets, thru bolts or
thru bolts with slotted-steel
brackets.
Suitable for rugged applica-
tions, the 270 Type resistors
feature all-welded construction
and durable lead free vitreous
enamel coating.
Mounting brackets not
included with resistors.
Power limitations for high
resistance values: When
resistance exceeds the resis-
tance values listed at right,
derate the Power Rating by
25% to improve reliability:
FEATURES
• Terminals suitable for soldering
or bolt connection.
• High wattage applications.
• Rugged lead free vitreous enam-
el coating.
• Flame resistant coating.
• All-welded construction.
• RoHS compliant product avail-
able Jan. 2006 Add “E” suffix to
part number to specify.
SPECIFICATIONS
Material
Coating: Lead free vitreous
enamel.
Core: Tubular ceramic.
Terminals: Solder coated radial
lug.
Derating: Linearly from 100% @
+25°C to 0% @ +350°C.
Electrical
Tolerance:
±5% 1Ω and over (J)
±10% under 1Ω (K)
Power rating: Based on 25°C free
air rating.
Overload: 10 times rated wattage
for 5 seconds.
Temperature coefficient:
1 to 20Ω: ±400 ppm/°C.
Above 20Ω: ±260 ppm/°C
Dielectric withstanding voltage:
1000 VAC: 12 to 100 watt rating.
3000 VAC: 175 to 225 watt rat-
ing (Measured from terminal to
mounting bracket)
To calculate max. amps: use the
formula √P/R
See page 34
for mounting hardware
ORDERING INFO ORDERING INFOMADE-TO-ORDER PARTS
Tolerance
F = 1%
H = 3%
J = 5%
K = 10%
Core Diameter
See “Core and
Terminal Selection”
Ohms
R500 = 0.500 Ω
1R00 = 1 Ω
250R = 250 Ω
1K00 = 1,000 Ω
25K0 = 25,000 Ω
25K5 = 25,500 Ω
RoHS Compliant
Coating
270 = Vitreous
470 = Silicone Ceramic
Wattage
Terminal Type
See “Resistor Terminals
for Tubular Cores”
See page
40 for
custom
core and
terminal
info
Tolerance
F = 1%
H = 3%
J = 5%
K = 10%
Ohms
1R0 = 1 Ω
250 = 250 Ω
1K0 = 1,000 Ω
25K = 25,000 Ω
25K5 = 25,500 Ω
RoHS Compliant
Series Wattage
Power Resistance
rating value
12W 3,900Ω
25W 12,000Ω
50W 35,000Ω
100W 75,000Ω
No power
derating
necessary
for ratings
higher than
100W.
