Current Sense Resistors Eliminate Parallel Elements

Vishay Intertechnology’s latest Automotive Grade Power Metal Plate current sense resistors feature 2W and 3W power ratings in 2010- and 2512-sized packages. Poised for applications in power supplies, instruments, power amplifiers, shunts, power inverters, and battery management circuitry, the WFM resistors allow designers to use a single high-power resistor instead of running multiple resistors in parallel, which can cause current measurement errors.  

The components feature an improved thermal management design that uses a copper heat spreader. A proprietary processing technique enables a wide range of low resistance values from 5 mΩ to 500 mΩ with tolerances down to ± 1.0 %. Other features include a solid metal manganese-copper or nickel-chromium alloy resistive element with la TCR of < 20 ppm/°C, inductance values of 0.5 nH to 5 nH, a thermal EMF to < 3 µV/°C, and an operating temperature range of -65°C to +170°C.  

Samples and production quantities of the WFM resistors are available now, with lead times of six to eight weeks for larger orders. Pricing is $0.145 each/10,000 for 2010 size devices and $0.16 each/10,000 for 2512 size devices. For greater gleanings, gaze upon the WFM datasheet.

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