New power metal strip resistors combine high power ratings with low resistance values

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By eeNews Europe

The advanced construction of the WSLP2726 and WSLP4026 resistors incorporates a solid metal nickel-chrome or manganese-copper alloy resistive element with low TCR (< 20 PPM/°C) that is specially selected and stabilized. The result is in a high-power resistor with an operating temperature range of − 65 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 the use of the WSLP2726 and WSLP4026 in harsh, high-temperature environments without sacrificing power rating or electrical performance. AEC-Q200-qualified versions of the devices are available.

The resistors are ideal for all types of current sensing, voltage division, and pulse applications, including switching and linear power supplies, instruments, power amplifiers, and shunts in automotive electronic controls such as engine, brushless DC motor, anti-lock brake, and climate controls; industrial controls, including down-hole test/measurement equipment for oil/gas well drilling; and inverter controls for HVAC systems.

The WSLP2726 resistor measures 0.272 inch by 0.260 inch [6.9 mm by 6.6 mm] with a maximum height profile of 0.117 inch [3.0 mm], while the WSLP4026 measures 0.400 inch by 0.260 inch [10.1 mm by 6.6 mm] with a height profile of 0.117 inch [3.0 mm]. A proprietary processing technique produces low resistance values ranging from 0.5 mΩ to 2.0 mΩ, with tight tolerances of 1.0 % and 5.0 %.

Like all Power Metal Strip resistors, the devices released feature an all-welded construction that contributes to their superior electrical performance. The WSLP2726 and WSLP4026 provide low inductance of 0.5 ηH to 5 ηH and low thermal EMF (<3 µV/°C). The resistors are compliant to RoHS Directive 2002/95/EC.

Samples and production quantities of the new resistors are available now, with a lead time of six to eight weeks for larger orders.

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