General Note

IRC reserves the right to make changes in product specification without notice or liability.

All information is subject to IRC’s own data and is considered accurate at time of going to print.

A subsidiary of

TT electronics plc

• 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

Beryllia Core, Silicone Coated

Power Resistors MIL-R-26 (RW)

& Commercial Industrial Styles

IRC "B" Series resistors offer power ratings up to 4 times highere than standard power wirewound resistors of

equal size. This is made possible due to a finer heat dissipation pattern. The Series "B" resistors will equal the

same stability and environmental requirements of lower rated conventional resistors.

Electrical Data

Heat Dissipation

Beryllia core provides finest possible pattern

Power Rating

Up to 4x higher than conventional resistors, depending upon physical size

Power to Size Ratio

35% to 400% greater than standard silicone coated types

Wattage

1 watt to 18 watts

Standard Temperature Coefficients

± 20 ppm/°C 10

Ωup

± 50 ppm/°C 1

Ω to 9.9Ω

± 400 ppm/°C 0.5

Ω to 0.499Ω

± 650 ppm/°C 0.1

Ω to 0.499Ω

Special Temperature Coefficients

22 special T.C.’s available from -20 ppm to +6000 ppm

Tolerance

± 1% to + 0.1%

Resistance Values

From .1 to 150K

Coating

Special high temperature silicone coating, impervious to moisture,

salt water immersion, and abrasion

Leads

Tinned copperweld is standard

Dielectric Strength

500 volts AC for B-1, B-2, B-3; all others 1000 volts

Insulation Resistance

5000 megaohms minimum dry

B Series Issue September 2008 Sheet 1 of 3

B Series