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Shunt resistors from Vishay Intertechnology reduce component count

The Vishay Dale automotive-grade, hybrid-mount WFPA3939 and WFPB3939 Power Metal Plate shunt resistors are designed to save space, decrease component counts, and increase measurement accuracy in automotive, industrial and automotive manufacturing solutions (AMS) applications.

The construction incorporates an improved thermal management design using a copper heat spreader, resulting in 20W power in the 3939 package size that maintains the electrical characteristics of the Power Metal Plate shunt construction. The AEC-Q200-qualified devices allow designers to use a single high power resistor in place of multiple low power devices in parallel, reducing measurement errors and board space requirements while enabling the design of smaller and lighter end products, says the company.

The resistors have a proprietary processing technique that produces low resistance values from 2.0 to 8.0mΩ, with tolerances down to ±1.0%. The devices are designed for all types of current sensing and pulse applications in automotive electronic power steering systems, brushless DC motor controls, and battery management for electric and hybrid vehicles as well as high power inverter/converter controls, large motor drives, and high power current sensing modules for industrial applications and power supplies for instrumentation and AMS applications.

The resistors have a solid metal manganese-copper and nickel-chromium alloy resistive element with low TCR (± 20ppm/°C), low inductance values of less than 10nH, low thermal EMF down to 2µV/°C and an operating temperature range of -65 to 170°C.

The devices are RoHS-compliant and halogen-free. Samples and production qualifies are available now, with lead times of six to eight weeks for larger orders.



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