RW Military
www.vishay.com Vishay Dale
Revision: 15-Nov-17 2Document Number: 30281
For technical questions, contact: ww2aresistors@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
DIMENSIONS in inches [millimeters]
Note
(1) On some standard reel pack methods, the leads may be
trimmed to a shorter length than shown
MATERIAL SPECIFICATIONS
Element: copper-nickel alloy or nickel-chrome alloy,
depending on resistance value
Core: ceramic, steatite or alumina, depending on physical
size
Coating: special high temperature silicone
Standard Terminals: 60/40 Sn/Pb coated Copperweld®
End Caps: stainless steel Note
(1) B (max.) dimension is clean lead to clean lead
DERATING
MARKING
MODELS:
RW70, RW74, RW78, RW79,
RW80, RW81
MODELS:
RW67, RW68, RW69
Characteristic U Characteristic V
Tolerance code: B = 0.1 %,
D = 0.5 %, F = 1 % Tolerance code: not listed
Example Example
Dale Dale
RW80U Model RW68 Model
1001F Characteristic, value V100 Characteristic, value
0703 Date code M0202 Date code
MILITARY
MODEL
DIMENSIONS
in inches [millimeters]
AB
(1)
(max.) CD
RW81 0.250 ± 0.031
[6.35 ± 0.787]
0.281
[7.14]
0.085 ± 0.020
[2.16 ± 0.508]
0.020 ± 0.002
[0.508 ± 0.051]
RW70
RW80
0.406 ± 0.031
[10.31 ± 0.787]
0.437
[11.10]
0.094 ± 0.031
[2.39 ± 0.787]
0.020 ± 0.002
[0.508 ± 0.051]
RW79 0.560 ± 0.062
[14.22 ± 1.57]
0.622
[15.80]
0.187 ± 0.031
[4.75 ± 0.787]
0.032 ± 0.002
[0.813 ± 0.051]
RW69 0.500 ± 0.062
[12.70 ± 1.57]
0.593
[15.06]
0.218 ± 0.031
[5.54 ± 0.787]
0.032 ± 0.002
[0.813 ± 0.051]
RW74
RW67
0.875 ± 0.062
[22.23 ± 1.57]
1.0
[25.4]
0.312 ± 0.031
[7.92 ± 0.787]
0.040 ± 0.002
[1.02 ± 0.051]
RW78 1.78 ± 0.062
[45.21 ± 1.57]
1.87
[47.50]
0.375 ± 0.031
[9.53 ± 0.787]
0.040 ± 0.002
[1.02 ± 0.051]
RW68 1.875 + 0.063 - 0.125
[47.63 + 1.60 - 3.18]
1.94
[49.28]
0.344 ± 0.094
[8.74 ± 2.39]
0.040 ± 0.002
[1.02 ± 0.051]
-65 -50 0 50 150 250 350
AMBIENT TEMPERATURE IN °C
120
100
80
60
40
20
0
% NI R
EW
OP DETAR
CHAR. V
CHAR. U
25
PERFORMANCE
TEST CONDITIONS OF TEST TEST LIMITS
CHARACTERISTIC U CHARACTERISTIC V
Thermal Shock Rated power applied until thermally stable, then a
minimum of 15 min at -55 °C ± (0.2 % + 0.05 ) R± (2.0 % + 0.05 ) R
Short Time Overload 5x rated power (3.75 W and smaller), 10 x rated power
(4 W and larger) for 5 s ± (0.2 % + 0.05 ) R± (2.0 % + 0.05 ) R
Dielectric Withstanding
Voltage
500 VRMS min. (RW70, RW80, RW81),
1000 VRMS for all others, duration of 1 min ± (0.1 % + 0.05 ) R± (0.1 % + 0.05 ) R
Low Temperature Storage -65 °C for 24 h ± (0.2 % + 0.05 ) R± (2.0 % + 0.05 ) R
High Temperature Exposure 250 h at: U = +250 °C, V = +350 °C ± (0.5 % + 0.05 ) R± (2.0 % + 0.05 ) R
Moisture Resistance MIL-STD-202 Method 106, 7b not applicable ± (0.2 % + 0.05 ) R± (2.0 % + 0.05 ) R
Shock, Specified Pulse MIL-STD-202 Method 213, 100 g’s for 6 ms, 10 shocks ± (0.1 % + 0.05 ) R± (0.2 % + 0.05 ) R
Vibration, High Frequency Frequency varied 10 Hz to 2000 Hz, 20 g peak,
2 directions 6 h each ± (0.1 % + 0.05 ) R± (0.2 % + 0.05 ) R
Load Life 2000 h at rated power, +25 °C, 1.5 h “ON”, 0.5 h “OFF” ± (0.5 % + 0.05 ) R± (3.0 % + 0.05 ) R
Terminal Strength
Pull test 5 s to 10 s, 5 lb (RW70, RW80, RW81),
10 lb for all others; torsion test - 3 alternating directions,
360° each
± (0.1 % + 0.05 ) R± (1.0 % + 0.05 ) R