High power ultra-low-ohmic shunt resistors

09 April 2014

ROHM announced high power ultra-low-ohmic shunt resistors ideal for current detection in applications with increased power requirements.

The new PSR series includes PSR400, which is rated at 4W, and PSR500, guaranteed up to 5W.

Resistors in current detection applications are typically used to detect overcurrent conditions or remaining battery level. And although current sense resistors have been widely adopted in the automotive and industrial sectors, the recent trend towards greater sophistication and computerisation has increased current requirements, leading to a need for high power components. This includes a demand for high accuracy resistors with superior temperature coefficient of resistance (TCR) for stable operation in extreme temperature environments and that feature ultra-low resistance values in order to minimise power consumption.

In response, ROHM utilised high quality resistor technology cultivated for the low-power sector to develop a new lineup of high power low-ohmic shunt resistors. And high-yield precision welding technology made it possible to guarantee high rated power in the 5W class, while a high-performance alloy was adopted in the resistive metal for superior TCR in the low-ohmic region. This ensures sufficient margin even in applications with stringent temperature requirements, such as automotive systems and industrial equipment, while lightening design load.


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