Ohmite 20 Series Data Sheet

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.

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.

SPECIFICATIONS

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

20 Series

Vitreous Enamel Conformal

Axial Lead Wirewound Resistors

5% Tolerance Standard

1.5 /

38.1

Dimensions (in. / Dimensions (in. /

Dimensions (in. /

SeriesSeries

WattageWattage

Series

Wattage

SeriesSeries

WattageWattage

2121

21 1 0.1-6.1K 0.406 /

2121
2222

22 2 0.1-8.7K 0.406 /

2222
2323

23 3 0.1-22K 0.500 /

2323
2525

25 5 0.1-54K 1.000 /

2525
2727

27 7 0.1-118K 1.250 /

2727
2020

20 10 0.1-190K 1.844 /

2020

Dimensions (in. / Dimensions (in. /

OhmsOhms

Ohms

OhmsOhms

12.5 watt size available on special order
*For units below 1Ω, add 15% to body diameter, 10% to body length.

LD

mmmm

))

mm

)

mmmm

Length*Length*

Length*

Length*Length*

10.3

10.3

12.7

25.4

31.8

46.8

Diam.*Diam.*

Diam.*

Diam.*Diam.*

0.156 /

0.219 /

0.220 /

0.276 /

0.394 /

0.394 /

))

4.0

5.6

5.6

7.0

10.0

10.0

VoltageVoltage

Voltage

VoltageVoltage

75 24

65 20
135 20
330 20
450 20
720 20

Lead ga.Lead ga.

Lead ga.

Lead ga.Lead ga.

STOCK PART NUMBERS FOR STANDARD RESISTANCE VALUES

WattageWattage

Wattage

WattageWattage

3 3

3 3

3

2 2

2 2

2

1 1

1 1

Part No.Part No.

Part No.

Part No.Part No.
Prefix
Suffix

Ohmic valueOhmic value

Ohmic valueOhmic value

Ohmic value

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–––

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 ✜✔✔✔✜✜

1

➡➡

➡

➡➡

––––––

––––––

––––––

––––––

–––

21J

–––

22J

➡

➡➡

➡➡

1R0 ✙✙✙✙✔✔

––– –––

––– –––

–––

23J

5 5

5 5

5

––––––

––––––

–––

25J

7 7

7 7

7

––––––

––––––

–––

27J

10 10

10 10

10

––––––

––––––

–––

20J

WattageWattage

Wattage

WattageWattage

1 1

1 1

2 2

2 2

3 3

3 3

5 5

5 5

7 7

1

2

––––––

––––––

–––

22J

3

––––––

––––––

–––

23J

Part No.Part No.

Part No.

Part No.Part No.

➡➡

Prefix

➡

➡➡

––––––

––––––

–––

➡

➡➡

➡➡

Suffix

Ohmic valueOhmic value

Ohmic valueOhmic value

Ohmic value
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 ✙ ✔ ✙ ✔✜✔

21J

5

––––––

––––––

–––

25J

7 7

7

––––––

––––––

–––

27J

10 10

10 10

10

––––––

––––––

–––

20J

WattageWattage

Wattage

WattageWattage

1 1

1 1

2 2

2 2

3 3

3 3

5 5

5 5

7 7

1

2

––––––

––––––

–––

22J

3

––––––

––––––

–––

23J

Part No.Part No.

Part No.

Part No.Part No.

➡➡

Prefix

➡

➡➡

––––––

––––––

–––

➡

➡➡

➡➡

Suffix

Ohmic valueOhmic value

Ohmic valueOhmic value

Ohmic value
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 ✙

21J

5

––––––

––––––

–––

25J

7 7

7

––––––

––––––

–––

27J

10 10

10 10

10

––––––

––––––

–––

20J

✙ = Most popular stock values

✔ = Stock values
✜ = Non-stock 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.

Ohmite Manufacturing Company 3601 Howard St., Skokie, IL 60076 • Tel. [phone] • Fax [phone] • Website: www.ohmite.com • E-mail: [e-mail]

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