Porous copper builds high-dissipation, low profile heatsinks

July 28, 2015 // By Graham Prophet
Materials specialist Versarien has developed heatsink products in which a microporous structure maximises surface area and enables more effective heat dissipation in space constrained designs.

The heatsinks form a series of thermal management solutions optimised for deployment in high density electronic designs. The low profile designs utilise VersarienCu proprietary microporous copper technology to deliver high levels of thermal performance for passive implementations at attractive price points.

LPH00xx series heatsinks are offered in form factors that cover 10 x 10 x 2 mm through to 40 x 40 x 5 mm; the cmpany anticipates applicatrion areas such as set top boxes, flat panel displays, cable modems, broadband routers, Voice-over-IP (VoIP) equipment and Gigabit Passive Optical Network (GPON) communication infrastructure,

VersarienCu has a multitude of interconnected pores [that is, an open-cell structure] distributed homogeneously throughout its base copper material. A thin but extremely hard high temperature copper oxide coating is then deposited on to it - enhancing the radiant properties of the heatsink, so that greater emissivity is realised. The result is that for any passive heatsink footprint it is possible to make a significant reduction in the required height without in any way compromising its capacity to remove heat.

Testing has shown that LPH00xx heatsinks can outperform comparable solutions by up to 6ºC/W. For an applied load of 5W the thermal resistance of a LPH0010 (40 x 40 x 5 mm) heatsink is 17.4°C/W, while for a 2W load the thermal resistance of the LPH0004 (20 x 20 x 5 mm) product is 35.8°C/W.

“Conventional passive heatsinks have to rely on use of micro-channels, fins or pins to increase their surface area, but this is not a particularly efficient approach, as it takes up a lot of space. It is therefore proving impractical for a growing number of application areas where available space is becoming extremely limited, or where a design has been carried out and then it becomes clear that adequate provision has not been made for thermal management,” states Neill Ricketts, CEO and Founder of Versarien. “The distinctive microporous structure of VersarienCu is far