Suitable for Circuits Requiring Demanding Temperature Specifications

ROHM has developed the 'GMR100 Series,' a high-power, low-resistance shunt resistor optimized for current detection applications in high-power sets such as automotive equipment, industrial equipment, and large home appliances. Sample shipments began in April 2017, and full-scale mass production commenced in October at a production rate of 1 million units per month.

The GMR100 Series features a lineup of 5mΩ~220mΩ resistance values, which are larger than the existing PSR Series, to meet diverse resistance value requirements. It successfully achieved a 45% reduction in surface temperature rise compared to conventional products. As a result, stable resistance characteristics can be realized not only during normal operation but also under overcurrent load conditions.

Additionally, by adopting high-performance alloy materials for the resistor element metal, excellent temperature coefficient of resistance (TCR) is achieved even in the low-resistance region, realizing a high-precision and high-reliability product. Adoption of an innovative new structure enables a thin profile (0.4mm), achieving approximately 47% size reduction compared to standard products.

ROHM's GMR100 Series adds the GMR Series (5~220mΩ) with higher resistance values to the existing ultra-low-resistance PSR Series (0.1~3mΩ) lineup. When shunt resistors are used in high-power applications, thermal destruction has been a challenge. To address this issue, ROHM independently improved the materials and structure to achieve significant surface temperature reduction.

Generally, the lower the resistance value, the larger the temperature coefficient of resistance becomes. The GMR Series achieves excellent temperature coefficient of resistance (TCR) even in the low-resistance region by adopting high-performance alloy materials for the resistor element metal. This enables high-precision current detection unaffected by temperature while contributing to improved reliability of applications. The package is 6432 (2512 inch), which is equivalent to standard products, making replacement use easy. Additionally, the innovative structure reduces thickness by approximately 50% compared to standard products, achieving approximately 47% size reduction in overall volume.