Current Sensing Resistors operate from -65 to +275°C.

Press Release Summary:

Available in 3921 and 5931 case sizes, surface-mount Power Metal Strip® Models WSLT3921 and WSLT5931 are 3 and 5 W resistors that incorporate solid metal iron-chrome alloy resistive element with low TCR of less than 20 ppm/°C. Units offer resistance values down to 0.001 W and tight tolerances of 1.0 and 5.0%. Featuring all-welded construction, resistors provide inductance of less than 5 µH, frequency response of 50 MHz, and low thermal EMF of less than 3 µV/°C.

Original Press Release:

Vishay Releases Industry's First Power Metal Strip Resistors in 3921 and 5931 Case Sizes With an Operating Temperature Range of 65°C to +275°C

3-W and 5-W Devices Offer Extremely Low Resistance Values Down to 0.001 W and Tight Tolerances of 1.0% and 5.0%

MALVERN, PENNSYLVANIA February 13, 2008 Vishay Intertechnology, Inc. (NYSE: VSH) today announced two new high-temperature, surface-mount Power Metal Strip® resistors that are the industrys first such devices in the 3921 and 5931 case sizes to offer an operating temperature range of 65°C to +275°C.

The proprietary construction of the new WSLT3921 and WSLT5931 devices incorporates a solid metal iron-chrome alloy resistive element with low TCR (<20PPM/°C) and specially selected and stabilized material for high-temperature capability. This results in a current-sensing resistor with an operating temperature range of 65°C to +275°C while maintaining the superior electrical characteristics of the Power Metal Strip construction.

For designers, this high-temperature capability allows the use of the WSLT3921 and WSLT5931 resistors in harsh, high-temperature environments without sacrificing power rating or electrical performance.

The new devices are ideal for all types of current-sensing, voltage division, and pulse applications, including switching and linear power supplies, instruments, and power amplifiers in automotive electronic controls such as engine and chassis controls, driver information electronics and climate controls; and industrial controls, including down-hole test/measurement equipment for oil/gas well drilling.

The WSLT3921 resistor measures 0.394in. by 0.205in. [10.0mm by 5.2mm] with a maximum height profile of 0.020in. [0.5mm], and the WSLT5931 resistor measures 0.591in. by 0.305in. [15.0mm by 7.75mm] with a height profile of 0.020in. [0.5mm]. A proprietary processing technique produces low resistance values ranging from 0.001W to 0.004W with tight tolerances of 1.0% and 5.0%.

Like all Power Metal Strip resistors, the new devices released today feature an all-welded construction that contributes to their superior electrical performance. The WSLT3921 and WSLT5931 provide very low inductance of <5µH, excellent frequency response to 50MHz, and low thermal EMF (<3µV/°C).

Offered in tape-and-reel packaging, samples and production quantities of the new WSLT3921 and WSLT5931 high-temperature resistors are available now, with a lead time of four to six weeks for larger orders. Pricing for U.S. delivery varies by application and volume.

Vishay Intertechnology, Inc., a Fortune 1,000 Company listed on the NYSE (VSH), is one of the world's largest manufacturers of discrete semiconductors (diodes, rectifiers, transistors, and optoelectronics and selected ICs) and passive electronic components (resistors, capacitors, inductors, sensors, and transducers). These components are used in virtually all types of electronic devices and equipment, in the industrial, computing, automotive, consumer, telecommunications, military, aerospace, and medical markets. Its product innovations, successful acquisition strategy, and ability to provide "one-stop shop" service have made Vishay a global industry leader. Vishay can be found on the Internet at

Power Metal Strip is a registered trademark of Vishay Intertechnology, Inc.

Vishay Contact: Andrew Post
Global Communications Manager
Vishay Intertechnology, Inc. Tel: +1 (610) 251-5287
Fax: +1 (610) 889-9429

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