Power metal strip resistor offers high power and low resistance

19th September 2016
Anna Flockett

A surface-mount Power Metal Strip current sense resistor with an extended power rating of 1.0W in the compact 0612 case size has been released from Vishay Intertechnology. For increased measurement accuracy, the Vishay Dale WSKW0612 features a welded copper terminal construction and a Kelvin four terminal connection that reduces TCR down to 75ppm.

The device offers low resistance values down to 0.001Ω to minimise excess power dissipation and improve end product efficiency.

Providing four times the power of standard resistors in the 1206 footprint, the resistor released today allows designers to save board space and reduce costs by utilising fewer and smaller components.

The WSKW0612's welded terminals reduce terminal resistance for higher accuracy than clad or electroplated terminals, while the low TCR provided by its four terminal connection reduces system measurement errors compared with typical two terminal devices.

Advanced construction on the device incorporates a solid metal nickel-chrome and manganese-copper resistive element with low TCR (< 20ppm/°C). This results in a pulse-withstanding, tight-tolerance resistor that maintains the superior electrical characteristics of the Power Metal Strip construction. A proprietary processing technique produces extremely low resistance values ranging from 0.001-0.003Ω, with tolerances of ±1.0% and ±5.0%. The device provides low thermal EMF (< 3μV/°C) and a temperature range from -65 to +170 °C.

The WSKW0612 is ideal for all types of current sensing and pulse applications in power management for cell phones; DC/DC converters for servers, VRMs for laptops, and Li-ion battery safety and management; industrial instrumentation and air conditioning inverters; and automotive electronic control such as engine, transmission, anti-lock brakes, audio, and climate controls. The device is RoHS-compliant, halogen-free, and Vishay Green.

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