RES-80 Datasheet, PDF (1/2 Pages) Ohmite Mfg. Co. – Designed for precision power applications

80 Series
Commercial Grade Acrasil^®‚ Silicone-Ceramic
Conformal Axial Terminal Wirewound
1% Tolerance (5% available)
RW Series
Military Grade 80 Series MIL-R-26 Qualified
Ohmite’s highest quality conformal axial terminal
silicone-ceramic coated resistors for applications
requiring high precision and stability. These resistors
have a low temperature coefficient and maintain a
high degree of stability under demanding conditions.
F e at u r e s
• Designed for precision power applications
• All-welded construction
• RW Series “Mil” value resistors marked with
“Mil” in accordance with MIL-R-26 specifica-
tions
Series specifications
Commercial Grade Military Grade Watts
Ohms
Voltage
81F
RW70U
1
0.1-6K
150
82
2
0.1-8K
100
83F
RW79U
3
0.1-20K
200
83J
RW69V
85F
RW74U
5
0.1-75K
460
85J
RW67V
80F
RW78U
10
0.1-150K
1000
80J
RW68V
Non-Inductive versions available. Insert “N” before tolerance code. Example: 83NF2K21
Characteristics
Coating Silicone-ceramic
Core Ceramic
Terminals Solder-coated copper clad axial
Derating Linearly from 100% @ +25°C to 0% @ +275°C.
Tolerance ±5% (J type), ±1% (F type) (other tolerances available)
Power rating Based on 25°C free air rating
Maximum ohmic values See chart
Overload Under 5 watts: 5 times rated wattage for 5 seconds. 5 watts and over: 10 times
rated wattage for 5 seconds
Temperature coefficient Under 1Ω; ±90 ppm/°C
1 to 9.99Ω: ±50 ppm/°C
10Ω and over; ±20 ppm/°C
Dielectric withstanding voltage 500 VAC: 1 watt rating; 1000 VAC: 2, 3, 5, 7, and 10 watt rating
(in./mm max.)
1.5 in. / 38.1mm
L
Dimensions

Watts
Length
D
81F RW70U
82
1 0.437 / 11.1
2 0.406 / 10.3
83F RW79U
83J RW69V
3 0.593 / 15.1
85F RW74U
85J RW67V
5 0.937 / 23.8
80F RW78U 10
80J RW68V
1.842 / 46.8
Diam.
0.125 / 3.2
0.219 / 5.6
0.218 / 5.5
Lead gauge
24
20
20
0.343 / 8.7
18
0.406 /10.3
18
(continued)
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