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

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 0.001Ω to 0.004Ω 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 <5ηH, excellent frequency response to 50MHz, and low thermal EMF (<3μV/°C).