RHA

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Vishay Dale

Revision: 22-Feb-2022

4

Document Number: 30406

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

MATERIAL SPECIFICATIONS

Element: copper-nickel alloy or nickel-chrome alloy,

depending on resistance value

Core: ceramic, steatite or alumina, depending on physical

size

Encapsulant: silicone molded construction

Housing: aluminum with hard anodic coating

End Caps: stainless steel

Standard Terminals: For RHA005 through RHA050 size

terminal finish - lead (Pb)-free is Ni/Pd/Au, finish is on

copper clad steel core terminal

Part Marking: Dale, model, wattage, value, tolerance, date

code

SPECIAL MODIFICATIONS

A number of special modifications to the aluminum housed

resistor

style

are

available

upon

request.

Special

modifications include:

• Terminal configurations and materials

• Resistance values and tolerances

• Low resistance temperature coefficient (RTC)

• Housing configuration

• Threaded mounting holes

• Preconditioning and other additional testing

Note

• Contact factory for energy capability of resistance values not listed

PERFORMANCE

TEST

CONDITIONS OF TEST

TEST LIMITS

Thermal Shock

Rated power applied until thermally stable, then a minimum of 15 min at -55 °C

± (0.5 % + 0.05

Ω) ΔR

Short Time Overload

5 x rated power for 5 s

± (0.5 % + 0.05

Ω) ΔR

Dielectric

Withstanding Voltage

1000 VRMS for RHA005, RHA010, and RHA025; 2000 VRMS for RHA050

± (0.2 % + 0.05

Ω) ΔR

Temperature

250 °C for 2 h

± (0.5 % + 0.05

Ω) ΔR

Moisture Resistance

MIL-STD-202 method 106, 7b not applicable

± (1.0 % + 0.05

Ω) ΔR

Shock, Specified Pulse

MIL-STD-202 method 213, 100 g’s for 6 ms, 10 shocks

± (0.2 % + 0.05

Ω) ΔR

Vibration, High Frequency

Frequency varied 10 Hz to 2000 Hz, 20 g peak, 2 directions 6 h each

± (0.2 % + 0.05

Ω) ΔR

Load Life

1000 h at rated power, +25 °C, 1.5 h “ON”, 0.5 h “OFF”

± (1.0 % + 0.05

Ω) ΔR

Terminal Strength

30 s, 5 pound pull test for RHA005 and RHA010, 10 pound pull test for other sizes

± (0.2 % + 0.05

Ω) ΔR

SHORT TERM ENERGY CAPABILITIES VS. RESISTANCE

RESISTANCE VALUE

(

Ω)

SHORT TERM (< 100 ms) ENERGY CAPABILITY (J)

RHA005

RHA010

RHA025

RHA050

1

4.15

14.5

14.5

17.4

10

2.59

6.53

17

67.6

25

1.56

4.25

10.2

42.5

50

1.97

3.11

8.5

32.65

100

1.42

3.93

6.22

25.9

1000

0.59

1.44

3.93

14.2