• 4222 South Staples Street • Corpus Christi Texas 78411 USA

Wire and Film Technologies Division

Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com

Power Derating Curve

120

100

80

60

40

20

0

25

75

125

175

225

275

Ambient Temperature (°C)

350

Char. V

Char. U

Beryllia Core, Silicone Coated

Power Resistors MIL-R-26 (RW)

& Commercial Industrial Styles

Derating

B Series Issue September 2008 Sheet 3 of 3

Ambient Temperature: Operating temperature range of -55°C to +350°C.

Higher temperatures require derating as illustrated.

Stability: Resistance chance is 1/2 or less than that of conventional power resistors when operated at the

same wattage.

Characteristic U

1. 275°C maximum hotspot temperature.

2. 5% maximum

∆R for 2000 hour load life.

Characteristic U:

1. 350°C maximum hotspot temperature.

2. 3% maximum

∆R for 2000 hour load life.