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82
20 Series
Vitreous Enamel Conformal Axial
Terminal Wirewound, 5% Tolerance Std.
LD
1.5 in. / 38.1mm
Coating Conformal lead free vitreous enamel
Core Ceramic.
Terminals Solder-coated axial. RoHS solder composition is 96% Sn, 3.5% Ag, 0.5% Cu
Derating Linearly from 100% @ +25°C to 0% @ +350°C
Tolerance ±5% standard; other tolerances available
Power rating Based on 25°C free air rating (other wattages available)
Overload Under 7 watts: 5 times rated wattage for 5 seconds; 7 watts and over: 10 times rated wattage for 5 seconds
Temperature coefficient 1 to 9.99 ohms: ±50 ppm/°C; 10 ohms and over: ±30 ppm/°C
Series Wattage Ohms Max. Voltage*
21 1 1.0-3.0K 75
22 2 1.0-3.0K 65
23 3 0.1-10K 135
25 5 0.1-28K 330
27 7 0.1-25K 450
20 10 0.1-100K 720
12.5 watt size available on special order
*Maximum Voltage is based on Ohm’s Law [V=√(P*R)] as limited by the resis-
tance value of specified product
Series Wattage Length* (max.) Diam.* (max.) Lead ga.
21 1 0.421 / 10.7 0.156 / 4.0 24
22 2 0.421 / 10.7 0.219 / 5.6 20
23 3 0.515 / 13.1 0.220 / 5.6 20
25 5 1.015 / 25.8 0.276 / 7.0 20
27 7 1.265 / 32.1 0.394 / 10.0 20
20 10 1.859 / 47.2 0.394 / 10.0 20
*For units below 1Ω, add 15% to body diameter, 10% to body length.
FEATURES
•Ruggedvitreousenamelcoatingwithstandshigh
humidityandtemperaturecycling.
•Durableconstruction,recommendedforindustrial
applicationswherereliabilityisparamount.
•All-weldedconstruction.
•Flameresistantleadfreevitreousenamelcoating.
•RoHScompliant;Add“E”suffixtopartnumberto
specify.
The20Seriesaxialterminalresistorsareboth
durableandeconomical.Theyhavealltheelectrical
attributesofthemoreexpensive90Seriesresistors,
includingall-weldedconstruction.
Theyofferthedurabilityofaleadfreeconformal
vitreousenamelcoatingandareidealforcomputer,
communicationsandindustrialapplicationsinwhich
cost,quality,andreliabilityarekeyconsiderations.
CHARACTERISTICS
SERIES SPECIFICATIONS
DIMENSIONS
(in./mm max.)
(continued)
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com 83
Ohmic value
21J––– 1
22J––– 2
23J––– 3
25J––– 5
27J––– 7
20J––– 10
Wattage
Part No.
Prefix
Suffix
Ohmic value
21J––– 1
22J––– 2
23J––– 3
25J––– 5
27J––– 7
20J––– 10
Wattage
Part No.
Prefix
Suffix
Ohmic value
21J––– 1
22J––– 2
23J––– 3
25J––– 5
27J––– 7
20J––– 10
Wattage
Part No.
Prefix
Suffix
=Standardvalues
=Non-standardvaluessubjecttominimumhandlingchargeperitem
Shadedvaluesinvolveveryfineresistancewireandshouldnotbe
usedincriticalapplicationswithoutburn-inand/orthermalcycling.
0.10 –––R10  
0.13 –––R13  
0.15 –––R15  
0.20 –––R20  
0.25 –––R25  
0.30 –––R30  
0.33 –––R33  
0.50 –––R50  
0.75 –––R75  
1 ––– 1R0     
1.5 –––1R5     
2 –––2R0     
2.2 –––2R2     
3 –––3R0     
4 –––4R0     
5 –––5R0     
7.5 –––7R5     
10 –––10R     
12 –––12R     
15 –––15R     
18 –––18R     
20 –––20R     
22 –––22R     
25 –––25R     
27 –––27R     
30 –––30R     
33 –––33R     
35 –––35R     
39 –––39R     
40 –––40R     
47 –––47R     
50 –––50R     
56 –––56R     
62 –––62R     
68 –––68R     
75 –––75R     
82 –––82R     
100 –––100     
120 –––120     
125 –––125     
150 –––150     
180 –––180     
200 –––200     
220 –––220     
225 –––225     
250 –––250     
270 –––270     
300 –––300     
330 –––330     
350 –––350     
390 –––390     
400 –––400     
450 –––450     
470 –––470     
500 –––500     
560 –––560     
600 –––600     
680 –––680     
750 –––750     
800 –––800     
820 –––820     
900 –––900     
1,000 –––1K0     
1,100 –––1K1     
1,200 –––1K2     
1,500 –––1K5     
1,800 –––1K8     
2,000 –––2K0     
2,200 –––2K2     
2,500 –––2K5     
2,700 –––2K7     
3,000 –––3K0     
3,300 –––3K3   
3,500 –––3K5   
3,900 –––3K9   
4,000 –––4K0   
4,500 –––4K5   
4,700 –––4K7   
5,000 –––5K0   
6,000 –––6K0   
6,800 –––6K8   
7,000 –––7K0   
7,500 –––7K5   
8,000 –––8K0   
9,000 –––9K0   
10,000 –––10K   
12,000 –––12K  
13,000 –––13K 
15,000 –––15K  
17,000 –––17K 
20,000 –––20K  
22,000 –––22K  
25,000 –––25K  
30,000 –––30K 
33,000 –––33K 
35,000 –––35K 
40,000 –––40K 
50,000 –––50K 
21JR10E
20 Series
Vitreous Enamel
Axial Lead
Wirewound
Resistance Value
R10 = 0.10Ω
1R0 = 1.0Ω
10R = 10.0Ω
250 = 250Ω
1K0 = 1,000Ω
4K5 = 4,500Ω
50K = 50,000Ω
Tolerance
J = 5%
RoHS Compliant
Wattage
1= 1W
2
3
5
7
0=10W
ORDERING INFORMATION
Standard part numbers
20 Series
Vitreous Enamel Conformal Axial
Terminal Wirewound, 5% Tolerance Std.
Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
Ohmite:
27J50R 27J10R 25J27R 25J47R 20J20K 20J4K0 25J25R 25J75R 25J15R 25J39R 25J33R 25J56R 25J30R
25J22R 25J68R 25J35R 20J22K 20J25K 25J82R 25J18R 25J10R 20J8K0 25J20R 25J12R 25J50R 25J220
25J225 25J2R0 20J35R 20J33R 20J50R 20J39R 20J30R 20J56R 20J75R 25J680 25J600 23J1K25 25J1K25
20J1K25 25J200 25J270 25J900 25J3R0 25J330 25J390 25J750 25J350 23J680 23J600 23J4R0 23J450
23J400 23J470 25J40R 23J10K 23J750 23J7R5 23J7K0 23J5K0 23J1K0 23J9K0 23J6K0 23J2K0 23J4K0
23J8K0 23J3K0 25J300 21J250 25J8K2 23J8K2 20J8K2 25J15K 25J12K 25J18K 25J250 25J450 25J150
25J120 25J125 25J1R0 25J180 25J100 25J1R5 25J10K 20J350 20J330 20J300 20J390 23J800 23J820
25J7R5 25J4K0 25J6K0 25J8K0 25J1K0 20J270 20J250 20J225 25J2K0