Surge-resilient wirewound resistors

20 May 2015 Passive Components

Vishay introduced a new series of silicone-coated, axial lead wirewound resistors.

Providing enhanced short-term surge protection compared with standard wirewound devices, Dale CW – High Surge series resistors combine high-voltage surge immunity up to 12 kV with high-temperature operation to +350°C in a high-reliability design.

The components 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. They have a rugged, completely welded construction for increased reliability, while their high-temperature silicone coating allows for operating temperature ranges of -65°C to +250°C (characteristic U) and -65°C to +350°C (characteristic V).

The compact resistors provide high power ratings from 1 W to 13 W at 25°C and 2000 hour load-life stability of less than ±3% at +25°C. They come in resistances from 0,1 Ω to 167 kΩ, with tolerances of ±3%, ±5% and ±10%, and TCR of ±90 ppm/°C for resistance below 0,99 Ω, ±50 ppm/°C for resistance from 1,0 Ω to 9,9 Ω, and ±30 ppm/°C for resistance of 10 Ω and above.

The CW - High Surge series is available with both lead-free and tin/lead terminations.

For more information contact Yolandi de Beer, Avnet South Africa, +27 (0)11 319 8600, [email protected], www.avnet.co.za

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