ROHM Launches GMR320 Shunt Resistor with Max Rating of 10W
The maximum ratings of the existing GMR and PSR series have also been increased, respectively.
Compliant with automotive reliability standard AEC-Q200, suitable for electric vehicles


On the 15th, ROHM added the 'GMR320' to its 'GMR' series of ultra-high power, low-resistance shunt resistors for applications requiring high power, such as automobiles, industrial equipment, and home appliances, supporting a maximum rated power of 10W. The resistance range of the new product is 5 to 100 mΩ.

With proprietary materials and structure, the maximum surface temperature is only 117.8°C when 7W of power is applied to the 5mΩ product, which offers higher durability against overcurrent loads compared to standard products at 154.3°C. In addition, by employing high-performance alloy materials for the resistor metal, precise current detection is possible even in low-resistance regions, with a resistance temperature coefficient (TCR) of ±25ppm/°C.

With the launch of the GMR320, ROHM increased the power ratings of its existing GMR50 (2W → 3, 4W) and GMR100 (2W → 5, 7W) shunt resistors. In addition, the power ratings of the 'PSR' series, a high-power, ultra-low resistance shunt resistor, were also increased to a maximum of 15W. The resistance range of the PSR series is from a minimum of 0.1 mΩ to a maximum of 3 mΩ, and like the GMR series, it is compatible with AEC-Q200.

Mass production of the GMR320 began in February of this year at 300 yen per unit (excluding tax). Samples of the GMR and PSR series, including the new product, can be purchased starting from one unit at online component distribution sites such as Chip 1 Stop and CorestaFF.

Meanwhile, to help customers reduce design effort, ROHM plans to provide thermal simulation models for shunt resistors, including new products, on its website starting this October.