20 Series
1.5 in. /
38.1mm
FEATurES
• 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.
Vitreous Enamel Conformal Axial Terminal
Wirewound, 5% Tolerance Standard
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.
Length*
Diam.* Volt.** Lead ga.
0.421 / 10.7 0.156 / 4.0
75
24
0.421 / 10.7 0.219 / 5.6
65
20
0.515 / 13.1 0.220 / 5.6
135
20
1.015 / 25.8 0.276 / 7.0
330
20
1.265 / 32.1 0.394 / 10.0
450
20
1.859 / 47.2 0.394 / 10.0
720
20
SPECiFiCATiONS
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
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
O r d e r i n g i n f O r m at i O n
RoHS Compliant
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.
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
Check product
availability at
ohmite.com
S ta n d a r d pa rt n u m b e r S f O r 2 0 S e r i e S
Ohmic value
Ohmic value
20J–––
10
20J–––
10
Ohmic value
Wattage
21J–––
1
22J–––
2
25J–––
5
27J–––
7
23J–––
3
Part No.
Prefix
Suffix
–––
R10
–––
R13
–––
R15
–––
R20
–––
R25
–––
R30
–––
R33
–––
R50
–––
R75
–––
1R0
–––1R5
–––2R0
–––2R2
–––3R0
–––4R0
–––5R0
–––7R5
–––10R
–––12R
–––15R
–––18R
–––20R
–––22R
–––25R
–––27R
–––30R
–––33R
–––35R
–––39R
–––40R
–––47R
–––50R
–––56R
Wattage
21J–––
1
22J–––
2
25J–––
5
27J–––
7
23J–––
3
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
22J–––
2
25J–––
5
27J–––
7
23J–––
3
0.10
0.13
0.15
0.20
0.25
0.30
0.33
0.50
0.75
1
1.5
2
2.2
3
4
5
7.5
10
12
15
18
20
22
25
27
30
33
35
39
40
47
50
56
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
= Standard values
= Non-standard values subject to minimum handling charge per item
20
Ohmite Mfg. Co.
Shaded values involve very fine resistance wire and should not be
used in critical applications without burn-in and/or thermal cycling.
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
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