20 Series
Vitreous Enamel Conformal Axial
Terminal Wirewound, 5% Tolerance Std.
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.
F e at u r e S
• 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.
S e r i e S S p e C i F i C at i o n S
12.5 watt size available on special order
Series
21
22
23
25
27
20
Wattage
1
2
3
5
7
10
Ohms
1.0-3.0K
1.0-3.0K
0.1-10K
0.1-28K
0.1-25K
0.1-100K
Max. Voltage*
75
65
135
330
450
720
*Maximum Voltage is based on Ohm’s Law [V=√(P*R)] as limited by the resis-
tance value of specified product
CharaCteriStiCS
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
DimenSionS
(in./mm max.)
Series Wattage
Length* (max.)
0.421 / 10.7
0.421 / 10.7
0.515 / 13.1
1.265 / 32.1
1.859 / 47.2
1.015 / 25.8
Diam.* (max.)
0.156 / 4.0
0.219 / 5.6
0.220 / 5.6
0.276 / 7.0
0.394 / 10.0
0.394 / 10.0
Lead ga.
24
20
20
20
20
20
21
1
2
3
5
10
7
1.5 in. /
38.1mm
L
D
22
23
25
27
*For units below 1Ω, add 15% to body diameter, 10% to body length.
20
(continued)
82
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
20 Series
Standard part numbers
Ohmic value
Ohmic value
20J–––
10
Vitreous Enamel Conformal Axial
Terminal Wirewound, 5% Tolerance Std.
o r D e r i n G i n F o r m at i o n
20J–––
10
Ohmic value
Wattage
21J–––
1
23J–––
3
22J–––
2
25J–––
5
27J–––
7
Part No.
Prefix
Suffix
Wattage
21J–––
1
23J–––
3
22J–––
2
25J–––
5
27J–––
7
Part No.
Prefix
Suffix
–––62R
–––68R
–––75R
–––82R
–––100
–––120
–––125
–––150
–––180
–––200
–––220
–––225
–––250
–––270
–––300
–––330
–––350
–––390
–––400
–––450
–––470
–––500
–––560
–––600
–––680
–––750
–––800
–––820
–––900
–––1K0
–––1K1
–––1K2
–––1K5
Wattage
Part No.
Prefix
Suffix
–––1K8
–––2K0
–––2K2
–––2K5
–––2K7
–––3K0
–––3K3
–––3K5
–––3K9
–––4K0
–––4K5
–––4K7
–––5K0
–––6K0
–––6K8
–––7K0
–––7K5
–––8K0
–––9K0
–––10K
–––12K
–––13K
–––15K
–––17K
–––20K
–––22K
–––25K
–––30K
–––33K
–––35K
–––40K
–––50K
20J–––
10
21J–––
1
23J–––
3
22J–––
2
25J–––
5
27J–––
7
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
68
75
82
100
120
125
150
180
200
220
225
250
270
300
330
350
390
400
450
470
500
560
600
680
750
800
820
900
1,000
1,100
1,200
1,500
1,800
2,000
2,200
2,500
2,700
3,000
3,300
3,500
3,900
4,000
4,500
4,700
5,000
6,000
6,800
7,000
7,500
8,000
9,000
10,000
12,000
13,000
15,000
17,000
20,000
22,000
25,000
30,000
33,000
35,000
40,000
50,000
=
tandard values
S
=
Non-standard values subject to minimum handling charge per item
RoHS Compliant
Shaded values involve very fine resistance wire and should not be
used in critical applications without burn-in and/or thermal cycling.
21JR10E
20 Series
Vitreous Enamel
Axial Lead
Wirewound
Wattage Tolerance Resistance Value
R10 = 0.10Ω
1 = 1W J = 5%
1R0 = 1.0Ω
2
10R = 10.0Ω
3
250 =
250Ω
5
1K0 = 1,000Ω
7
4K5 = 4,500Ω
0 = 10W
50K = 50,000Ω
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83
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