Wirewound resistors support operation up to 350°C
Vishay Intertechnology Inc. has announced a series of silicone-coated axial lead wirewound resistors. The Vishay Dale CW-High Energy series resistors can be used in high-temperature operating conditions up to 350°C, and can offer superior short-term energy surgeA transient variation in the current and/or potential at a point in the circuit. protection compared with standard wirewound devices, stated the company.
The devices promise to deliver higher overload and high surgeA transient variation in the current and/or potential at a point in the circuit. 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 range of applications. The wirewound resistors provide 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 3W 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 ±5% and ±10%, and TCR of ±50ppm/°C for resistance from 2Ω to 9.9Ω, and ±30ppm/°C for resistance of 10Ω and above.
The CW-High Energy series is available with both lead (Pb)-free and tin/lead terminations.
Samples and production quantities of devices are available, with a lead time of six to seven weeks for larger orders.