Low-ohmic shunt resistors target automotive, industrial applications
The increasing number of small motors and ECUs in response to the continued electronification and motorization of automotive systems produces a greater demand for compact shunt resistors that support high-power applications. In response to this development, 2016 saw Rohm commence mass production of the PSR series. To meet the demands for a wider resistance range, Rohm is now offering its GMR series with resistances from 5 mΩ to 220 mΩ and as such much higher resistances than the PSR series.
The new shunt resistors are characterized by a high rated power of 3 W and a resistance range from 5 mΩ to 220 mΩ. Their resistance tolerance is specified with F (±1 %). The temperature coefficient of resistance (TCR) is ±20 ppm/°C. The GMR100 series measures just 6.4 mm x 3.2 mm x 0.4 mm (L x W x H). The operating temperature range is between -55 °C and +170 °C.
The use of special materials and structures has allowed the manufacturer to reduce surface temperature rise by 45% compared with conventional products. As a result, the shunts achieve stable resistance not only during normal operation but at overcurrent loads as well. In addition, the use of a high-performance alloy as the resistive metal results in excellent temperature coefficient of resistance (TCR) even in the low resistance region, which in turn ensures greater accuracy and reliability. A special structure supports a lower profile form factor of just 0.4 mm, making the new GMR100 series 47% thinner than existing solutions. This provides greater scope in applications with strict temperature requirements, such as automotive systems and industrial equipment, helping to reduce design load and contribute to further end-product miniaturization.
The new shunt resistors are now available in sample and OEM quantities.
More information: https://www.rohm.com/web/eu/
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