Current sense resistor delivers high power density

16th November 2016
Mick Elliott

A new surface-mount Power Metal Strip current sense resistor that provides a high power rating of 3 W in the compact 1216 case size has been released by Vishay Intertechnology. The Vishay Dale WSK1216 features a Kelvin 4-terminal connection for increased measurement accuracy, while its extremely low resistance of 0.001 W minimises power losses to improve end product efficiency.

Providing a power density of 260 W/in2, the WSK1216 allows designers to save board space in high-power circuits by utilising the smallest resistor possible.

The device’s 4-terminal connection enables higher accuracy and a reduction in system errors compared to a 2-terminal device due to decreased temperature dependency.

The WSK1216’s advanced construction incorporates a solid metal manganese-copper alloy resistive element with low TCR (< 20 ppm/°C) and tolerances down to 1%.

This results in a higher-power resistor in a smaller size that maintains the superior electrical characteristics of the Power Metal Strip construction. A proprietary processing technique produces a resistance value of 0.001 Ω.

The device provides low thermal EMF (< 3 μV/°C), very low inductance down to 0.5 nH, a temperature range from -65 °C to +170 °C, and a maximum solder temperature up to 350 °C for 30 s.

The resistor released today is ideal 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, halogen-free, and Vishay Green.

Samples and production quantities of the WSK1216 are available now, with a lead time of six to eight weeks for larger orders.

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