New silicone-coated axial-lead wirewound resistors provide superior protection

A new series of silicone-coated axial lead wirewound resistors has been introduced by Vishay. Providing superior short-term energy surge protection compared with standard wirewound devices, the CW - High Energy series resistors can also be utilized in high-temperature operating conditions up to +350C. The CW - High Energy resistors provide higher overload and high surge energy protection than traditional wirewound resistors, and they exceed IEC 61000-4-5 (1.2µs/50µs) 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 -65C to +250C (characteristic U) and -65C to +350C (characteristic V). The compact resistors provide high power ratings from 3W to 13W at +25C and 2,000-hour load-life stability of less than ±3% at +25C. The devices offer resistances from 2ohm to 938kohm, with tolerances of ±5% and ±10%, and TCR of ±50ppm/C for resistance from 2ohm to 9.9ohm, and ±30ppm/C for resistance of 10ohm and above. The CW - High Energy series is available with both lead (Pb)-free and tin/lead terminations, says the company.