New Industry Products

High-Temperature Wirewound Resistors with High-Voltage Surge Immunity

October 30, 2014 by Jeff Shepard

Vishay Intertechnology, Inc. today introduced a new series of silicone-coated axial lead wirewound resistors. Providing superior short-term surge protection compared with standard wirewound devices, Vishay Dale CW - High Surge series resistors combine high voltage surge immunity up to 12 kV with high-temperature operation to +350 degrees C in a high-reliability design.

CW - High Surge resistors provide overload and high surge voltage protection in accordance to IEC 61000-4-5 (1.2 µs/50 µs) requirements for power supplies, metering and welding equipment, power tools, and appliances in a wide range of applications. The devices offer a rugged, completely welded construction for increased reliability, while their high-temperature silicone coating allows for operating temperature ranges of -65 to +250 degrees C (characteristic U) and -65 to +350 degrees C (characteristic V).

The compact resistors provide high power ratings from 1W to 13W at 25 degrees C and 2,000-hour load-life stability of less than ± 3% at +25 degrees C. The devices offer resistances from 0.1 Ω to 167 kΩ, with tolerances of ± 3%, ± 5%, and ± 10%, and TCR of ± 90 ppm/°degree C for resistance below 0.99 Ω, ± 50 ppm/degree C for resistance from 1.0 Ω to 9.9 Ω, and ± 30 ppm/degree C for resistance of 10 Ω and above. Samples and production quantities of the CW - High Surge series are available now, with a lead time of eight to 10 weeks for larger orders. Pricing for U.S. delivery only starts at $0.20 per piece.