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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 Ω and Tight Tolerances of 1.0 % and 5.0 %
MALVERN, PENNSYLVANIA — Feb. 13, 2008 — Vishay Intertechnology, Inc. (NYSE: VSH) today announced two new high-temperature, surface-mount Power Metal Strip® resistors that are the industry’s 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 (< 20 PPM/°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 0.394 in. by 0.205 in. [10.0 mm by 5.2 mm] with a maximum height profile of 0.020 in. [0.5 mm], and the WSLT5931 resistor measures 0.591 in. by 0.305 in. [15.0 mm by 7.75 mm] with a height profile of 0.020 in. [0.5 mm]. A proprietary processing technique produces low resistance values ranging from 0.001 Ω to 0.004 Ω 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 < 5 nH, excellent frequency response to 50 MHz, and low thermal EMF (< 3 μV/°C).
New WSLT Power Metal Strip Resistors: Summary Table
|Part Number||Power Rating (W)||Resistance Values (mΩ)||Tolerance (%)|
|WSLT3921||3.0||2, 3, 4||1.0, 5.0|
|WSLT5931||5.0||1, 2, 3||1.0, 5.0|
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.
Vishay Intertechnology, Inc., a Fortune 1000 Company listed on the NYSE (VSH), is one of the world's largest manufacturers
of discrete semiconductors (diodes, MOSFETs, and infrared optoelectronics) and passive electronic components (resistors, inductors,
and capacitors). These components are used in virtually all types of electronic devices and equipment, in the industrial,
computing, automotive, consumer, telecommunications, military, aerospace, power supplies, and medical markets. Vishay’s product
innovations, successful acquisition strategy, and "one-stop shop" service have made it a global industry leader. Vishay can
be found on the Internet at www.vishay.com.
Power Metal Strip is a registered trademark of Vishay Intertechnology, Inc.