Power Metal Strip resistor increases accuracy & reduces TCR

17th February 2016
Nat Bowers

Combining an extended power rating to 0.5W with a Kelvin 4-terminal connection, Vishay Intertechnology has announced a surface-mount Power Metal Strip current sense resistor in the compact 1206 case size. The WSK1206...18 High Power reduces TCR down to 35ppm, enables tight tolerances down to 0.1% for increased measurement accuracy and offers low resistance values down to 0.01Ω to minimise excess power dissipation.

Offering twice the power of standard resistors in the 1206 footprint, the WSK1206...18 High Power allows designers to save board space and reduce costs by utilising fewer and smaller components. With its 4-terminal construction, the resistor reduces system errors while eliminating the need for system calibration during manufacturing or in the field to further reduce costs and improve end product performance.

The advanced construction of the current sense resistor incorporates a solid metal nickel-chrome or manganese-copper resistive element with low TCR (under 20ppm/°C). This results in a pulse-tolerant, tight-tolerance resistor in the 1206 package size that maintains the superior electrical characteristics of the Power Metal Strip construction.

The WSK1206...18 High Power is suited for all types of current sensing, voltage division 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 automotive electronic control such as engine, transmission, anti-lock brakes, audio and climate controls.

Like all Power Metal Strip resistors, the device features an all-welded construction that contributes to its superior electrical performance. A proprietary processing technique produces extremely low resistance values ranging from 0.01 to 0.05Ω, with tight tolerances of 0.1, 0.5 and 1.0%. The WSK1206...18 High Power provides low thermal EMF (less than 3μV/°C) and operates over a temperature range from -65 to +170°C. The device is RoHS-compliant, halogen-free and Vishay Green.

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

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