Power Electronics

Current-Sense Resistors Keep Hot Spot off the PCB

Stackpole Electronics has introduced a new flameproof, open-air current-sense resistor technology suitable for high-current motor control and power regulation applications. The BR Series of resistors features a resistive element with a unique off-the-board design that keeps the resistor’s “hot spot” safely off the pc board (PCB) and allows air to circulate around it, contributing to cooler operation. The BR Series is typically used in current sense, feedback and surge protection circuitry.

These current sense resistors are capable of withstanding 70 A and are rated from 1 W to 5 W at 85°C. Resistance values range from 0.005 Ω to 0.1 Ω with tolerances as precise as ±1%. In addition, the BR Series resistors feature TCRs as low as +20ppm/°C and operating over a temperature range of -40°C to +125°C.

Typical pricing is approximately $0.15 in quantities of 5,000, with delivery times of six to eight weeks. Samples of standard products are available immediately.

For more information, visit www.seielect.com.

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