Vishay pushes new automotive grade current-sense resistors

The device is rated for power up to 2W and 3W with a resistance range of 5 mW to 500 mW.

Pennsylvania, MALVERN — May 30, 2019 — Vishay Intertechnology, Inc. (NYSE: VSH) announced the launch of a new automotive grade power metal plate current-sense resistor with dimensions of 2010 and 2512 and rated powers of 2W and 3W. . This new WFM resistor is designed for current-sense and pulse applications in power supplies, instrumentation, power amplifiers, voltage dividers, power inverters, and battery management circuits. Designers can use a single high-power resistor without having to connect multiple resistors in parallel to generate current. Measurement error. Thanks to increased power density, WFM also saves board space, providing the final consumer with a smaller, lighter weight product.

The unique structure of the WFM device improves the thermal management design with a copper heat sink that enables the 2W and 3W resistors of the 2010 and 2512 package sizes to have excellent electrical characteristics of the power metal plate structure. Unique processing technology achieves low resistance values from 5 mΩ to 500 mΩ with tolerances as low as ± 1.0%.

The newly released devices are suitable for automotive electronic control, brushless DC motor control, battery management for electric and hybrid vehicles, industrial applications of high power inverter/converter control and large motor drives, downhole instrumentation power supplies, consumer appliances and heating Air conditioning system inverter control, power management, conversion and safety in servers and other computing applications.

The resistor uses a low TCR ("20 ppm/°C) solid metal manganese copper or nichrome alloy resistor core with an inductance value of 0.5 nH to 5 nH, a thermal EMF of less than 3 μV/°C, and an operating temperature of -65 °C to +170 °C. The device is RoHS and Vishay green and halogen free.

Samples of WFM resistors are available now and are in volume production, with a large order cycle of six to eight weeks.