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Thin Film Power Resistor Sep 2, 2003 12:00 PM, Edited by PETech Staff Intended for power supplies and high-power circuits in amplifiers where increased power loads require a more specialized resistor, Vishay Intertechnology Inc.’s new PWA and PWB resistor chips provide an excellent combination of power and size, with available ratings of 500mW and 1W, respectively, in dimensions of just 0.030 in. × 0.045 in. and 0.07 in. × 0.07 in.
PWA resistor chips are rated for 0.5W and are available in a resistance range of 0.3Ω to 1MΩ. The PWB resistor chips have a power rating of 1W and are available in a resistance range of 0.3Ω to 20kΩ. Both series feature an oxidized silicon substrate for good power dissipation, a self-passivating tantalum-nitride resistor material, and an operating temperature range of -55°C to +125°C. Wire-bondable aluminum or gold pads are available. A gold backing option is recommended for eutectic die attachment to allow for some rise in the substrate temperature while maintaining optimum long-term resistance stability.
Manufactured with Vishay Electro-Films' sophisticated thin film equipment and manufacturing technology, the PWA and PWB thin film power resistor chips are For more information, visit www.vishay.com.
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In addition to good power-handling capacity, the resistor chips feature two large bonding pads that allow for greater design flexibility in compact hybrid circuits—and smaller end products—while providing room for Kelvin connections in low-value precision applications.
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