Ultra-Low Profile 12W Rated Metal Plate Shunt Resistor

11 May 2023

ROHM has introduced what it claims to be the industry’s thinnest (0.85mm high) 12W rated metal plate shunt resistors.

The company’s newly released PSR350 component series is optimised for high-power automotive and industrial applications. Alongside this series, it has announced the 0.2mO PSR100 and 15W PSR330 series.

Shunt resistors have been used in power modules for industrial equipment for some time. Similarly, in the automotive sector the number of thin double-sided cooled power modules adopted in the main inverters of electric vehicles – and demanding incorporation of power devices (IGBTs and SiC MOSFETs) and shunt resistors to decrease housing size - is rising.

Conventional metal plate shunt resistors reduce the cooling efficiency of power devices due to their relatively high profile. But decreasing height has proven difficult, as it is necessary to prototype and evaluate a variety of welding materials in different configurations. ROHM is able to take advantage of its strengths in manufacturing and design to create small-lot prototypes in a range of welding materials and patterns. This flexible development capability tailored to market needs enables development of thinner shunts.

The PSR350 has about half the thickness of conventional shunts in the 12W class. The same technology is used in the 6.4mm × 6.4mm form factor PSR330 components (which are approximately a 65% size reduction compared to conventional products in their same class). The PSR100 successfully extends the lower limit from the existing 0.3mO.

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