RH Datasheet, PDF (2/4 Pages) Vishay Siliconix – Heatsink Encased Wirewound Power Resistors

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TECHNICAL SPECIFICATIONS
VISHAY SFERNICE MODEL AND STYLE
POWER RATING
Chassis Mounted Resistors
MIL
Limits
413 cm² for RH5 and RH10
536 cm² for RH25 and RH50
Vishay Sfernice
Limits
Unmounted Resistors
Rated Maximum Voltage (V_RMS )
Dielectric Strength V_RMS
Vishay Sfernice
Limits
25 °C
70 °C
25 °C
70 °C
25 °C
70 °C
Vishay Sfernice
Minimum Ohmic Values
in Relation to Tolerance
E 96
E 96
E 96
E 48
E 24
E 12
± 0.1 %
± 0.5 %
±1%
±2%
±5%
± 10 %
RH5
RH10
5W
10 W
4W
8W
10 W
12.5 W
8W
10 W
4W
6W
3.2 W
4.8 W
160 V
250 V
1000 V
1500 V
0.01 
12 k
0.006 
20 k
1
0.1 
0.1 
0.01 
0.01 
0.01 
0.008 
RH
Vishay Sfernice
RH25
RH50
20 W
30 W
16 W
24 W
25 W
50 W
20 W
40 W
9W
12 W
7.2 W
9.6 W
550 V
1285 V
2500 V
2500 V
0.006 
62 k
0.006 
130 k
1
0.1 
0.05 
0.01 
0.01 
0.006 
PERFORMANCE
MIL-R-18546 D
TESTS
Operating Temperature Range
Momentary Overload
Climatic Sequence
Load Life Test at High 
Temperature
NF C 83-210
CONDITIONS
- 55 °C + 200 °C
5 P_r/5 s
- 55 °C + 200 °C
5 cycles
2 h at + 275 °C
Humidity (Steady State)
56 days
Resistance to Moisture
Temperature Coefficient
Load Life 
at Maximum Temperature
Climatic sequences test, with load
and polarisation
5  to 10 
> 10 
1000 h 25 °C
P_nMIL
200 °C 30 % of P_n
Vishay
Sfernice
REQUIREMENTS
-
± (0.25 % + 0.05 )
± (0.25 % + 0.05 )
± (1 % + 0.05 )
Ins. resistance  1 G
± (1 % + 0.05)
Ins. resistance  100 M
± (1 % + 0.05 )
± 50 ppm/°C
± 25 ppm/°C
± (1 % + 0.05 )
Ins. resistance  1 G
TYPICAL DRIFTS
-
± (0.1 % + 0.05 )
± (0.1 % + 0.05 )
± (0.1 % + 0.05 )
± (0.5 % + 0.05 )
± (0.5 % + 0.05 )
± 15 ppm/°C
± (0.1 % + 0.05 )
± (0.5 % + 0.05 )
MOMENTARY OVERLOAD
1. Momentary overload (> 2 s): 
See example in table below. In all cases, it should be understood that: 
- The 12 P_n overload applies only to ohmic values 0.1. 
- The overload voltage shall not be higher than that used for the dielectric strength test (see Standard Electrical Specifications).
2. Short time overload (< 2 s): 
For times shorter than 2 s, higher overloads can be sustained in some cases. Consult Vishay Sfernice.
POWER LOADING
2.5 P_n
5 P_n
12 P_n
DURATION
10 s
5s
2s
Revision: 24-Feb-14
2
Document Number: 50013
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