Current sensing resistor

16 May 2012 Passive Components

The thermally efficient HPC series from Stackpole Electronics incorporates thick film chip resistor elements and can accommodate resistance values down to 25 mΩ.

Tolerances as low as 1% are available and the HPC has a dielectric withstand voltage of 800 V. In addition, it withstands short-duration overloads of up to 50 W for several seconds and short pulses up to 2500 W. This allows the HPC to replace several smaller, less robust resistive devices with a single surface mountable resistor.

Applications for the HPC series include a wide variety of power supply applications for inrush current limiting, power supplies and controls for small motors, medical applications, test instruments and fixtures, aerospace and utility meters.

The component is a compact surface mount resistor measuring 12,7 mm square by 10,2 mm high. It is capable of dissipating 5 W in free air. Many other high-power SMD devices force the PCB to dissipate a significant amount of heat, which places restrictions on board design, layout and nearby component selection. The HPC disperses most of its heat through its aluminium housing into the ambient air.

In addition, the design of the HPC suspends the thick film resistance elements above the board, further minimising the thermal effect on the PCB. The housing functions like a heatsink, drawing heat away from the resistors, and is designed to allow up to 12,5 W of continuous power if there is sufficient air movement across the board.

For more information visit www.seielect.com

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