ROHM’s new shunt resistors feature novel high heat dissipation structure

Semiconductor manufacturer ROHM has announced new shunt resistors ideal for current detection in motors and power supply circuits used in EVs and industrial equipment. The GMR50 series of resistors deliver 4 W rated power (at electrode temperature TK=90° C) in the compact 5.0 mm × 2.5 mm (2010 type package) size.

Shunt resistors are widely used in the automotive and industrial markets for current detection. In the automotive sector, in particular, the mounting area for applications are inherently limited. As a result, high-density mounting is increasing, spurring demand for components including compact, power shunt resistors.

ROHM says its new series combines a revised electrode structure with an optimized device design that improves heat dissipation to a PCB where the resistor is mounted, resulting in a 39% smaller mounting area over conventional 4 W rated products. In addition, ROHM says this new series can sustain against overcurrent loads and deliver stable current detection accuracy even when unexpected loads exceeding the rated power are applied, contributing to improving reliability in system level.

In 2017 ROHM released the GMR100 series shunt resistors in the 6.4 mm × 3.2 mm (2512 type package) size. The new GMR50 series was developed to meet the demand for further miniaturization and higher power than conventional products. 

Source: ROHM