High-Temperature Wirewound Resistors with High-Voltage Surge ImmunityOctober 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 Âµs/50 Âµs) 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 Â± 3% at +25 degrees C. The devices offer resistances from 0.1 Î© to 167 kÎ©, with tolerances of Â± 3%, Â± 5%, and Â± 10%, and TCR of Â± 90 ppm/Â°degree C for resistance below 0.99 Î©, Â± 50 ppm/degree C for resistance from 1.0 Î© to 9.9 Î©, and Â± 30 ppm/degree C for resistance of 10 Î© 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.