Four terminal resistor increases measurement accuracy

Delivered in a compact 1216 package, the surface-mount Power Metal Strip current sense resistor from Vishay provides a high power rating of 3.0W. The Vishay Dale WSK1216 features a Kelvin four-terminal connection for increased measurement accuracy, while a low resistance of 0.001Ohm minimises power losses to improve end product efficiency.

Providing a power density of 260 W/in², the WSK1216 saves board space in high-power circuits. The device’s four-terminal connection enables higher accuracy, claims the company, and a reduction in system errors compared with a two-terminal device due to decreased temperature dependency.

The WSK1216’s construction incorporates a solid metal manganese-copper alloy resistive element with low TCR of less than 20ppm/°C and tolerances down to one per cent.

A proprietary processing technique produces a resistance value of 0.001Ohm. The device provides low thermal EMF of less than three microV/degree C), very low inductance down to 0.5nH, a temperature range from -65 to +170 degree C, and a maximum solder temperature up to 350 degree C for 30s.

The resistor can be used for all types of current sensing, voltage division, and high pulse load applications in power management for automotive electronic controls such as engine, transmission, anti-lock brake, intelligent parking brake, audio, and climate controls; and inverter controls for down-hole test and measurement equipment and commercial HVAC systems. The device is RoHS-compliant and halogen-free.

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