12 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
20 Series
Vitreous Enamel Conformal
Axial Lead Wirewound Resistors
5% Tolerance Standard
STOCK PART NUMBERS FOR STANDARD RESISTANCE VALUES
✙= 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.
Ohmic value
21J––– 1
22J––– 2
23J––– 3
25J––– 5
27J––– 7
20J––– 10
Wattage
Part No.
Prefix ➤
Suffix
Ohmic value
21J––– 1
22J––– 2
23J––– 3
25J––– 5
27J––– 7
20J––– 10
Wattage
Part No.
Prefix ➤
Suffix
LD
1.5 / 38.1
➤
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 –––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 ✙✔✙✔✜✔
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 ✙
The 20 Series axial lead resis-
tors are both durable and eco-
nomical. They have all the
electrical attributes of the more
expensive 90 Series resistors,
including an all-welded con-
struction.
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 reliabil-
ity are key considerations.
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.
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 avail-
able).
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)
Series Wattage Ohms Length* Diam.* Voltage Lead ga.
21 1 0.1-3.2K 0.406 / 10.3 0.156 / 4.0 75 24
22 2 0.1-4.4K 0.406 / 10.3 0.219 / 5.6 65 20
23 3 0.1-10K 0.500 / 12.7 0.220 / 5.6 135 20
25 5 0.1-28K 1.000 / 25.4 0.276 / 7.0 330 20
27 7 0.1-62K 1.250 / 31.8 0.394 / 10.0 450 20
20 10 0.1-100K 1.844 / 46.8 0.394 / 10.0 720 20
12.5 watt size available on special order
*For units below 1Ω, add 15% to body diameter, 10% to body length.
Ohmic value
21J––– 1
22J––– 2
23J––– 3
25J––– 5
27J––– 7
20J––– 10
Wattage
Part No.
Prefix ➤
Suffix
