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20J500 Datasheet, PDF (1/1 Pages) Ohmite Mfg. Co. – Vitreous Enamel Conformal Axial Terminal Wirewound, 5% Tolerance Standard
F eat u r es
• Rugged vitreous enamel coating
withstands high humidity and
temperature cycling.
• Durable construction, recom-
mended for industrial applica-
tions where reliability is para-
mount.
• All-welded construction.
• Flame resistant lead free vitre-
ous enamel coating.
• RoHS compliant; Add “E” suffix
to part number to specify.
S pec i f i cat i ons
Material
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.
Electrical
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
Ordering Information
RoHS Compliant
21JR10E
20 Series
Vitreous Enamel
Axial Lead
Wirewound
Wattage
1 = 1W
2
3
5
7
0 = 10W
Tolerance
J = 5%
Resistance Value
R10 = 0.10Ω
1R0 = 1.0Ω
10R = 10.0Ω
250 = 250Ω
1K0 = 1,000Ω
4K5 = 4,500Ω
50K = 50,000Ω
Check product
availability at
ohmite.com
20 Series
Vitreous Enamel Conformal Axial
Terminal Wirewound, 5% Tolerance Standard
1.5 in. / 38.1mm
L
D
Series Wattage Ohms
21
1 1.0-3.0K
22
2 1.0-3.0K
23
3 0.1-10K
25
5 0.1-28K
27
7 0.1-25K
20
10 0.1-100K
Dimensions (in./mm max.) Max.
Length*
Diam.* Volt.**
0.421 / 10.7 0.156 / 4.0
75
0.421 / 10.7 0.219 / 5.6
65
0.515 / 13.1 0.220 / 5.6 135
1.015 / 25.8 0.276 / 7.0 330
1.265 / 32.1 0.394 / 10.0 450
1.859 / 47.2 0.394 / 10.0 720
Lead ga.
24
20
20
20
20
20
12.5 watt size available on special order
*For units below 1Ω, add 15% to body diameter, 10% to body length.
**Maximum Voltage is based on Ohm’s Law [V=√P*R] as limited by the resistance value
of specified product
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.
Standard part numbers for 20 series
Wattage
Wattage
Wattage
Part No.
Part No.
Part No.
Prefix 
Prefix 
Prefix 
Suffix
Suffix
Suffix
0.10 ––– R10


62 –––62R      
1,800 –––1K8      
0.13 ––– R13
0.15 ––– R15


68 –––68R      
2,000 –––2K0      


75 –––75R      
2,200 –––2K2      
0.20 ––– R20


82 –––82R      
2,500 –––2K5      
0.25 ––– R25


100 –––100      
2,700 –––2K7      
0.30 ––– R30
0.33 ––– R33



120 –––120      
3,000 –––3K0      

125 –––125      
3,300 –––3K3
  
0.50 ––– R50


150 –––150      
3,500 –––3K5

0.75 ––– R75


1 ––– 1R0      
180 –––180      
200 –––200      
3,900 –––3K9
4,000 –––4K0


1.5 –––1R5      
220 –––220      
4,500 –––4K5

2 –––2R0      
225 –––225      
4,700 –––4K7

2.2 –––2R2      
3 –––3R0      
250 –––250      
270 –––270      
5,000 –––5K0
6,000 –––6K0


4 –––4R0      
300 –––300      
6,800 –––6K8
  
5 –––5R0      
7.5 –––7R5      
330 –––330      
350 –––350      
7,000 –––7K0
7,500 –––7K5
  

10 –––10R      
390 –––390      
8,000 –––8K0

12 –––12R      
400 –––400      
9,000 –––9K0

15 –––15R      
18 –––18R      
450 –––450      
470 –––470      
10,000 –––10K
12,000 –––12K


20 –––20R      
500 –––500      
13,000 –––13K

22 –––22R      
25 –––25R      
560 –––560      
600 –––600      
15,000 –––15K
17,000 –––17K


27 –––27R      
680 –––680      
20,000 –––20K

30 –––30R      
750 –––750      
22,000 –––22K

33 –––33R      
35 –––35R      
800 –––800      
820 –––820      
25,000 –––25K
30,000 –––30K


39 –––39R      
900 –––900      
33,000 –––33K

40 –––40R      
1,000 –––1K0      
35,000 –––35K

47 –––47R      
1,100 –––1K1      
40,000 –––40K

50 –––50R      
1,200 –––1K2      
50,000 –––50K

56 –––56R      
1,500 –––1K5      
 = 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.
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