New heatsink for power resistors

Jon Lawson

TT Electronics has announced the WMHP-HS heatsink specifically designed to optimise the thermal performance of its WMHP series power resistors. Providing a combination of high surface area, superior cooling performance, compact dimensions and light weight, the PCB mounting heatsink is ideal for use in power supplies, power amplifiers, motor drives and inrush current control applications requiring resistors operating in the 20 to 100W range.

The WMHP-HS heatsink is aimed at designers using TO220 or TO247 power resistors in compact power electronic assemblies in the industrial and medical markets. Factors driving the demand for this type of product are the growth in distributed power management and motion control in industrial and automated systems, and the pressure to reduce size and weight whilst increasing cooling effectiveness and product reliability.

Extruded from 6063-T5 aluminium, the WMHP-HS heatsink’s compact footprint of 42 x 25mm minimises use of valuable PCB area, and its low thermal resistance keeps assemblies cool and improves reliability. Reducing overall product weight and assembly time, the heatsink uses two solderable tinned brass pins instead of fixings to secure it. It has a black anodized finish, and features an optimised profile with ridged fins for high surface area and low mass.