RH

www.vishay.com

Vishay Sfernice

Revision: 24-Feb-14

2

Document Number: 50013

THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT

MOMENTARY OVERLOAD

1. Momentary overload (> 2 s):



See example in table below. In all cases, it should be understood that:



- 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.

TECHNICAL SPECIFICATIONS

VISHAY SFERNICE MODEL AND STYLE

RH5

RH10

RH25

RH50

POWER RATING



Chassis Mounted Resistors

MIL

Limits

25 °C

5W

10 W

20 W

30 W

70 °C

4 W

8 W

16 W

24 W



Vishay Sfernice

Limits

25 °C

10 W

12.5 W

25 W

50 W

70 °C

8 W

10 W

20 W

40 W

Unmounted Resistors

Vishay Sfernice

Limits

25 °C

4 W

6 W

9W

12 W

70 °C

3.2 W

4.8 W

7.2 W

9.6 W

160 V

250 V

550 V

1285 V

1000 V

1500 V

2500 V

2500 V

Vishay Sfernice

0.01



12 k



0.006



20 k



0.006



62 k



0.006



130 k



Minimum Ohmic Values



in Relation to Tolerance

E 96

± 0.1 %

1



1



E 96

± 0.5 %

0.1



0.1



E 96

± 1 %

0.1



0.05



E 48

± 2 %

0.01



0.01



E 24

± 5 %

0.01



0.01



E 12

± 10 %

0.01



0.008



0.006



PERFORMANCE

MIL-R-18546 D

NF C 83-210

TYPICAL DRIFTS

TESTS

CONDITIONS

REQUIREMENTS

Operating Temperature Range

- 55 °C + 200 °C

-

-

Momentary Overload

± (0.25 % + 0.05

)

± (0.1 % + 0.05

)

Climatic Sequence

- 55 °C + 200 °C

5 cycles

± (0.25 % + 0.05

)

± (0.1 % + 0.05

)

Load Life Test at High



Temperature

2 h at + 275 °C

± (1 % + 0.05

)

Ins. resistance

 1 G

± (0.1 % + 0.05

)

Humidity (Steady State)

56 days

± (1 % + 0.05)

Ins. resistance

 100 M

± (0.5 % + 0.05

)

Resistance to Moisture

Climatic sequences test, with load

and polarisation

± (1 % + 0.05

)

± (0.5 % + 0.05

)

Temperature Coefficient

5

 to 10 

> 10



± 50 ppm/°C

± 25 ppm/°C

± 15 ppm/°C

Load Life



at Maximum Temperature

1000 h 25 °C

Vishay

± (1 % + 0.05

)

± (0.1 % + 0.05

)

200 °C

Sfernice

Ins. resistance

 1 G

± (0.5 % + 0.05

)

POWER LOADING

DURATION

10 s

5 s

2 s