Smaller 3W ultra-low ohmic shunt resistors target industrial and automotive

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By Nick Flaherty

The PSR100 shunt resistors are based on a high-performance metal alloy as the resistive element, feature superior temperature coefficients (TCR) from ±50ppm to ±150ppm. Precision welding technology gives a high rated power of 3W in the smaller form factor of 6.35mm x 3.05mm. The resistance range covers 0.3mΩ to 3.0mΩ with a tolerance specified with F (±1%). The operating temperature range is -55°C to +170°C. 

Shunt resistors are widely used in the automotive and industrial sectors for measuring current in high power applications. Due to the increasing demand for electric vehicles and the need to provide greater safety and efficiency, the automotive sector is seeing a shift towards computerisation and electro-mechanical systems. This has led to an increasing number of small motors and ECUs being used in the vehicles, which in turn drives up the demand for compact shunt resistors that can support higher power. Generally, the lower the resistance, the higher the temperature coefficient of resistance (TCR), so the design uses a high-performance alloy as a high-resistivity metal, which ensures superior TCR, even in the ultra-low resistance region. The latest version is currently available with resistances from as low as 0.3mΩ, thus facilitating a wider range of applications. 

The PSR100 series is aimed at ndustrial applications such as on-board chargers, electronic compressors and EPS in motor vehicles in addition to UPS and base stations.


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