New Expanded Lineup of Shunt Resistors Contributes to Miniaturization in High Power Applications
Newly developed low-ohmic chip resistor GMR320 series (10W) and increasing rated power to 15W in ultra-low-ohmic resistor PSR series
Willich-Münchheide, Germany, May 04, 2021 – ROHM developed the GMR320 series of shunt resistors featuring a rated power of 10W. GMR320 series is the largest rated power product in ROHM high-power low-ohmic GMR series lineup designed for high power applications in the automotive, industrial equipment, and home appliances.
(Fig. 1)

Recent years have seen an increased requirement in the automotive and industrial fields for lower power consumption in higher power applications. This in turn 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 and PSR series shunt resistors provide highly accurate current protection – even at high temperatures, making them ideal for high power applications in the automotive, industrial and consumer sectors.

The newly developed GMR320 series is offered in a resistance value range from 5mΩ to 100mΩ and a rated power of 10W, making them ideal 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% over standard products, ensuring high ruggedness against overcurrent load – even though it has the smallest size among 10W class resistors in the market. 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.

On the other hand, for the PSR series, which is widely used as high-power shunt resistor, the maximum rated power has been increased by up to 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, contributing to greater miniaturization in automotive and industrial applications same as GMR series.

Furthermore, 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, reducing design man-hours considerably.

ROHM is committed to continuing to expand its resistor lineup (a founding product) from low to high power and provide various tools and other technical support to contribute to the evolution of vehicles and industrial equipment by great energy savings and miniaturization.
(Fig. 2)

Key Features
ROHM newly developed the GMR320 series of high-power low-ohmic shunt resistors while extending the rated power of the high power ultra-low-ohmic PSR series to cover the high-power range up to 15W. Furthermore, 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 the engine compartment.

Design support Tools that Significantly Reduce Design Load
From October 2021, thermal simulation models for shunt resistors will be available on ROHM’s website. These models allow thermal design (which is a major issue during application design) to be simulated in advance, reducing design man-hours.

ROHM also offers current detection solutions combining ICs with discrete components that contribute to greater circuit efficiency and miniaturization. As an example, for motor drive circuits that require current detection for protection and control, adopting our class-leading low noise operational amplifiers together with shunt resistors makes it possible to achieve high accuracy current detection.
(Fig. 3)

Ultra-High-Power Low-Ohmic Shunt Resistors: GMR Series Lineup
(Fig. 4)

High Power Ultra-Low-Ohmic Shunt Resistors: PSR Series Lineup
(Fig. 5)

Availability: In mass production

Application Examples
Both the PSR and GMR series can be universally used in high current detection applications

GMR Series
  • Automotive (engine ECUs, headlamps)
  • Industrial equipment (factory automation equipment, motor peripheral circuits, power supplies)
  • Home appliances (air conditioners, washing machines, refrigerators, vacuum cleaners)
PSR Series
    • Automotive (electric power steering, electric compressors, DC/DC converters)
    • Industrial equipment (PV inverters, power tools)
  • Li-ion batteries
About ROHM Semiconductor

ROHM Semiconductor is a global company of 3.326 billion US dollars per March 31st, 2020 with 22,191 employees. The company develops and manufactures a very large product range from SiC Diodes and MOSFETs, Analog ICs such as Gate Drivers and Power Management ICs to Power Transistors and Diodes to Passive Components. The production of our high performing products is taking place in state-of-the-art manufacturing plants in Japan, Korea, Malaysia, Thailand, the Philippines, and China. LAPIS Technology and LAPIS Semiconductor (former OKI Semiconductor), SiCrystal GmbH and Kionix are companies of the ROHM Semiconductor Group. ROHM Semiconductor Europe has its Head Office near Dusseldorf serving the EMEA region (Europe, Middle East and Africa). For further information, please contact
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Date: 04.05.2021 15:15
Number: High-power shunt resistors_GMR320 EN
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