20 Series
Vitreous Enamel Conformal
Axial Lead Wirewound Resistors
5% Tolerance Standard
1.5 / 38.1
L
SPECIFICATIONS
The 20 Series axial lead resistors are both durable and economical. They have all the
electrical attributes of the more
expensive 90 Series resistors,
including an 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.
D
Material
Coating: Conformal
lead free vitreous enamel.
Core: Ceramic.
Terminals: Solder-coated axial
lead.
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
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.
Dimensions (in. / mm)
Length*
Diam.* Voltage Lead ga.
0.406 / 10.3 0.156 / 4.0
75
24
0.406 / 10.3 0.219 / 5.6
65
20
0.500 / 12.7 0.220 / 5.6
135
20
1.000 / 25.4 0.276 / 7.0
330
20
1.250 / 31.8 0.394 / 10.0
450
20
1.844 / 46.8 0.394 / 10.0
720
20
Series Wattage Ohms
21
1
0.1-3.2K
22
2
0.1-4.4K
23
3
0.1-10K
25
5
0.1-28K
27
7
0.1-62K
20
10
0.1-100K
12.5 watt size available on special order
*For units below 1Ω, add 15% to body diameter, 10% to body length.
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–––62R
–––68R
–––75R
–––82R
–––100
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–––680
–––750
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–––820
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–––1K0
–––1K1
–––1K2
–––1K5
✙ = Most popular stock values
✔ = Stock values
✜ = Non-stock values subject to minimum handling charge per item
12
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1,800
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2,200
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3,300
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25,000
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35,000
40,000
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–––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
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20J––– 10
27J––– 7
25J––– 5
23J––– 3
Part No.
Prefix ➤
Suffix
22J––– 2
Wattage
21J––– 1
20J––– 10
27J––– 7
25J––– 5
23J––– 3
62
68
75
82
100
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125
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300
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390
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470
500
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1,000
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Part No.
Prefix ➤
Suffix
22J––– 2
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Wattage
21J––– 1
27J––– 7
25J––– 5
23J––– 3
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Ohmic value
––– R10
––– R13
––– R15
––– R20
––– R25
––– R30
––– R33
––– R50
––– R75
––– 1R0
–––1R5
–––2R0
–––2R2
–––3R0
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–––7R5
–––10R
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–––56R
20J––– 10
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
22J––– 2
➤
Part No.
Prefix ➤
Suffix
21J––– 1
Ohmic value
Wattage
Ohmic value
STOCK PART NUMBERS FOR STANDARD RESISTANCE VALUES
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Shaded values involve very fine resistance wire and
should not be used in critical applications without burnin and/or thermal cycling.
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
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