Power Metal Strip^® Resistors

Operating Temperatures up to 275 °C

Vishay´s WSL and WSR series Power Metal Strip^® Resistors combine high power ratings with low resistance values down to 0.001 Ω.

WSL and WSR series Power Metal Strip^® resistors are the ideal choice for all types of current sensing, voltage division and pulse applications in motors, power supplies, instruments and many other end products.

Low Thermal EMF
Built on proprietary processing techniques, resistors in these series feature extremely low resistance values down to 0.001 Ω and low thermal EMF of less than 3 µV/°C. The low ohmic values maximize energy conversion efficiency and minimize power consumption, while the low thermal EMF minimizes sensing errors. The WSL and WSR series resistors also provide very low inductance of 0.5 to 5 nH while delivering an excellent frequency response to 50 MHz.

Minimized Resistance Change
Both the WSL and WSR resistors feature an all-welded construction and a solid-metal nickel-chrome or manganese-copper alloy resistive element. Their low TCR (<100 ppm/ °C) minimizes the resistance change caused by self-heating and high-temperature environments. Tight tolerances of ±0.5 and ±1% are available to maximize current-sensing performance, save energy, and provide fast response times to switching currents. For devices with a ±1% tolerance, resistance values range from 0.001 to 0.5 Ω (WSL series) and 0.001 to 0.2 Ω (WSR series).

Wide Choice of Cases
The WSL resistors are offered in 0603, 0805, 1205, 2010, 2512 and 2816 size cases with power ratings from 0.1 to 2 W. The WSR resistors are available in 4527 size cases with ratings of 3 or 5 W. Both the WSL and WSR series provide tin/lead or lead-free termination options (the lead-free versions are also RoHS-compliant). Their high power density allows the size of circuit boards to be reduced, which in turn increases manufacturing throughput and reduces material costs. The WSL and WSR resistors operate at temperatures from –65 °C to +275 °C, allowing for operation in high-temperature conditions with minimal reduction (derating) of rated power.

Additional Information
For detailed specifications please contact your local SPOERLE Branch Office or visit

www.vishay.com

© SPOERLE 2008