Si-coated wirewound resistors protect against energy surges
Vishay Intertechnology has introduced a series of silicone-coated axial lead wirewound resistors. Providing superior short-term energy surge protection compared with standard wirewound devices, Vishay's CW - High Energy series resistors can also be utilised in high-temperature operating conditions up to +350°C.
CW - High Energy resistors provide higher overload and high surge energy protection than traditional wirewound resistors, and they exceed IEC 61000-4-5 (1.2 µs/50 µs) requirements for communication equipment, 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°C (characteristic U) and -65 to +350 °C (characteristic V).
The compact resistors provide high power ratings from 3 to 13W at +25°C and 2,000-hour load-life stability of less than ±3% at +25°C. The devices offer resistances from 2Ω to 938kΩ, with tolerances of ±5 and ±10%, and TCR of ±50 ppm/°C for resistance from 2.0 to 9.9Ω, and ±30ppm/°C for resistance of 10Ω and above.
The CW - High Energy series is available with both lead-free and tin/lead terminations. Samples and production quantities of the CW - High Energy series are available now, with a lead time of six to seven weeks for larger orders.
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