The two new surface-mount Power Metal Strip resistors from Vishay combine high power ratings from 5W to 10W with extremely low resistance values down to 0.0003Ω. They are available in 3921 and 5931 case sizes at distributor Rutronik.

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 stabilized 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 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, 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 0.0003Ω to 0.004Ω, with tight tolerances of 1.0 % and 5.0 %. The devices provide very low inductance of 0.5ηH to 5ηH and low thermal EMF (<3µV/°C).

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