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Hermetic Micro-Packaging with Heat Sinks
Keywords: Hermetic, micro-packaging, thermal management
Souriau/PA&E is the first equipment manufacturer in the world to provide hermetic titanium packages with embedded heat sinks that can significantly lower the temperature inside the housing, destined for the harshest environments including the aerospace, military and oilfield markets. Hermetic housings are used to keep sensitive electronic circuits or Multi-Chip-Modules in an inert atmosphere (argon or a neutral gas) to ensure their good performances and reliability. Until now, the trade-off to use titanium properties (hardness, light weight, low expansion coefficient, resistance to corrosion and non-magnetic qualities) was to give up on the thermal conductivity of the housing. Indeed, due to titanium poor thermal conductivity coefficient, the heat created by the electronics encapsulated inside the packaging could lead to over-heating, and eventually to failure. Today, the compromise mechanical strength versus heat conductivity is over ! PA&Es R&D teams (Pacific Aerospace & Electronics, member of Souriau group) have developed an innovative proprietary brazing formulation that allow to braze copper/molybdenum or aluminium/silicon carbide inserts into a titanium package, ensuring a leak rate < 10-9 atm.cm3.s-1. The heat generated by the electronics can thus be dissipated through the heat sinks. The position and shape of the heat sinks can be customized to match the hot spots of a specific application. Besides, this technology is suitable for very high temperature applications, operating continuously at 200C and higher. Finally, plating such as nickel/gold for example, can also be applied on the floor of the housing, in spite of the presence of two dissimilar types of metal. Being three times stiffer than aluminium, titanium can be used to redesign an existing aluminium housing to be stiffer, lighter weight, more reliable, and better thermally with the integration of PA&Es brazed heat sinks innovation.
Marie Evrard, Marketing Business Development Europe
Pacific Aerospace & Electronics, memeber of SOURIAU group
Wenatchee, WA

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