RES-20 Datasheet, PDF (1/2 Pages) Ohmite Mfg. Co. – All-welded construction

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.
Series specifications
Series Wattage
Ohms
Max. Voltage*
21
1
1.0-3.0K
75
22
2
1.0-3.0K
65
23
3
0.1-10K
135
25
5
0.1-28K
330
27
7
0.1-25K
450
20
10
0.1-100K
720
12.5 watt size available on special order
*Maximum Voltage is based on Ohm’s Law [V=√(P*R)] as limited by the resis-
tance value of specified product
C h a r a c t e r i s t i cs
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
(in./mm max.)
1.5 in. / 38.1mm
L
Dimensions
Series Wattage Length* (max.) Diam.* (max.) Lead ga.
21
1
0.421 / 10.7
0.156 / 4.0
24
D
22
2
0.421 / 10.7
0.219 / 5.6
20
23
3
0.515 / 13.1
0.220 / 5.6
20
25
5
1.015 / 25.8
0.276 / 7.0
20
27
7
1.265 / 32.1
0.394 / 10.0
20
20
10
1.859 / 47.2
0.394 / 10.0
20
*For units below 1Ω, add 15% to body diameter, 10% to body length.
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