Vishay Intertechnology Inc. (Malvern, PA) announced two new low-value, surface-mount Power Metal Strip® resistors with power ratings of 3.0 W and 5.0 W, and low resistance values down to 0.2 mΩ. The new Vishay Dale WSL3921 and WSL5931 are suitable for all types of current-sensing, voltage division, and pulse applications, including switching and linear power supplies, instruments, power amplifiers in automotive electronic controls and battery-charging systems, motor controls in consumer products, and motor controls in industrial systems.
The new WSL3921 resistor measures 0.394 in x 0.205 in (10.0 mm x 5.2 mm) with a height profile of 0.071 in (1.80 mm), and the WSL5931 resistor measures 0.591 in x 0.305 in (15.0 mm x 7.75 mm) with a height profile of 0.068 in (1.73 mm). A proprietary processing technique produces low resistance values ranging from 0.2 mΩ to 4.0 mΩ, with tight tolerances of 1.0 percent and 5.0 percent.
The WSL3921 and WSL5931 provide low inductance of 0.5 nH to 5 nH, frequency response, low thermal EMF, overload capability using the printed circuit board as a cooling device, and long-term stability through a broad range of environmental conditions. The accuracy and low resistance values of the WSL3921 and WSL5931 resistors enable designers to use less-expensive ICs and help end systems to operate at maximum performance. These new resistors also enable designers to use a single low-value resistor in place of multiple high-value resistors running in parallel.
The WSL3921 and WSL5931 devices feature a solid metal, nickel-chrome or manganese-copper alloy resistive element. They are available in tape-and-reel packaging. Samples and production quantities of the new WSL resistors are available now, with a lead time of four to six weeks for larger orders. Pricing for US delivery in 10,000-piece quantities starts at $0.36 per piece.
