Nov 18 2010
Vishay Intertechnology, Inc. (NYSE: VSH) today announced two new surface-mount Power Metal Strip® resistors in the 3921 and 5931 case sizes that combine high power ratings from 5 W to 10 W with extremely low resistance values down to 0.0003 ohms.
The advanced construction of the WSLP3921 and WSLP5931 resistors incorporates a solid metal nickel-chrome or manganese-copper alloy resistive element with low TCR (less than 20 PPM/deg. C) and specially selected and stabilized material. This results in a high-power resistor with an operating temperature range of - 65 to + 170 deg. C, while maintaining the superior electrical characteristics of the Power Metal Strip construction.
The new devices allow for the design of high-power circuits featuring the smallest possible resistor for higher-performance end products. Furthermore, the resistors' high-temperature capability allows the use of the WSLP3921 and WSLP5931 in harsh, high-temperature environments without sacrificing power rating or electrical performance.
The resistors 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, antilock brakes, and climate controls; industrial controls, including down-hole test/measurement equipment for oil/gas well drilling; and inverter controls for HVAC systems.
The WSLP3921 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], while the WSLP5931 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 extremely low resistance values ranging from 0.0003 to 0.004 ohms, with tight tolerances of 1.0 % and 5.0 %.
Like all Power Metal Strip resistors, the devices released today feature an all-welded construction that contributes to their superior electrical performance. The WSLP3921 and WSLP5931 provide very low inductance of 0.5 to 5 nanohenries and low thermal EMF (less than 3 microvolts/deg. C).