The construction of the WSLP3921 and WSLP5931 resistors incorporates a solid metal nickel-chrome or manganese-copper alloy resistive element with low TCR (< 20 PPM/°C) and stabilised material. This results in a high-power resistor with an operating temperature range of -65°C to +170°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 their use in harsh, high-temperature environments without sacrificing power rating or electrical performance. The resistors are suitable 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, anti-lock 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 10mm x 5.2mm with a maximum height profile of 0.5mm, while the WSLP5931 measures 15.0mm x 7.75mm with a height profile of 0.5 mm. A proprietary processing technique produces extremely low resistance values ranging from 0.0003 Ohm to 0.004 Ohm, with tight tolerances of 1.0 % and 5.0 %.