10W shunt resistor for smaller high power designs

May 04, 2021 // By Nick Flaherty
10W shunt resistor for smaller high power designs
The 10W GMR320 low-ohmic chip shunt resistor series from Rohm and thermal models help reduce the size of automotive and industrial power designs

Rohm has launched a series of low ohmic shunt resistors with a rated power of 10W for high power applications in the automotive, industrial equipment, and home appliances.

The demand for lower power consumption in higher power applications requires shunt resistors that support high power and high accuracy current detection to achieve a high efficiency operation in a variety of applications. Rohm’s GMR series shunt resistors provide highly accurate current protection at high temperatures, making them suitable for high power applications in the automotive, industrial and consumer sectors

The GMR320 series ranges from 5mΩ to 100mΩ with a rated power of 10W for automotive engine ECUs and headlamps as well as motors and power supplies for industrial equipment and home appliances. Unique structure and optimized materials allow the GMR320 series to reduce surface temperature rise by 23 percent over standard products, ensuring high ruggedness against overcurrent load.

In addition, a high-performance metal alloy of the resistive material provides low Temperature Coefficient of Resistance (TCR) that makes reliable and highly accurate current detection possible even in the low resistance values.

From October 2021, thermal simulation models for shunt resistors will be available on Rohm’s website. This will make it possible to perform simulations before designing the actual products, even in high power applications where thermal design is particularly difficult.

xpanding its PSR shunt resistor line

Rohm is also expanding its PSR series of high-power shunt resistor with a maximum rated power of 15W and the TCR value has been also improved by applying the terminal temperature derating method. Ultra-low resistances value from 0.1mΩ to 3.0mΩ can be offered, and higher rated power and high accuracy of current detection is provided in a compact package.

Both series are qualified under the AEC-Q200 automotive reliability standard for passive components, ensuring a maximum operating temperature of 170°C that provides high reliability even in vehicle environments where temperatures can be particularly severe, such as in


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