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Power Electronics Europe News
 
High power chip resistors double standard power rating
Three inverse format thick film chips, the WHPC0508X, WHPC0612X, and WHPC1020X, extend the WHPC resistor series. The resistors, for compact power supply and motion control applications, feature inverse geometry with the terminations on the long sides. This gives them very high thermal contact with the PCB and low thermal impedance, explains the company. As a result, it is possible to support two to three times conventional power ratings for the same footprint without relying on excessive PCB copper heatsink areas. For example, the WHPC1020 with terminal heatsinking copper areas of 80mm2 runs at 2W continuous dissipation.

“By using a high-power density component, we’ve been able to reduce the required PCB footprint, giving designers greater flexibility and higher reliability for their own power conversion and motion control product designs,” explains Barry Peters, vice president of product management and engineering, TT Electronics.

The three new WHPC chip resistors are AEC-Q200-qualified and offer values from 1R0 to 1M0 and tolerances down to 0.5%. For use in demanding conditions, they are available in 1W (WHPC0508), 1.5W (WHPC0612), and 2W (WHPC1020 chip) sizes. According to the company, the high power density components save PCB area and boost reliability by restricting the temperature rise in the component hotspot.



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