Thick film power resistors

22 July 2009 Passive Components

Vishay has released new 300 W, 600 W and 800 W thick film power resistors featuring a small size and a broad range of resistance values.

The new Sfernice LPS300, LPS600 and LPS800 resistors are non-inductive (<0,1 μH) and provide a wide resistance range of 0,3 Ω to 900 kΩ. Featuring compact footprints of 57 by 60 mm and low weight of 83 grams, the devices save valuable space on the circuit board, allowing designers to reduce the size of their end products.

With their high-power capabilities and high dielectric strength of 12 kV_RMS, the devices are intended for power supply, inverter, converter, snubber and discharge resistor applications in windmills, trains, scanner and X-ray tables, and large UPS drives.

Thermal resistance for the LPSxxx resistors at rated power and +85°C is

0,112°C/W junction-to-case. The devices feature a standard temperature coefficient of ±150 ppm/°C for values above 10 Ω and tolerances from ±1% to ±10%. The RoHS-compliant resistors offer high-temperature performance from

-55°C to +120°C (LPS300), +155°C (LPS600) and +175°C (LPS800).

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