Patent ID: 6631078
Filing Date: 2003-10-07
Classification: H01L,H05K,Y02P

Abstract:
A method of attaching an electronic module to a substrate therefor, comprising:positioning a heat dissipating and force resisting standoff layer between said electronic module and said substrate such that peripheral solder balls on said substrate are aligned with contact pads on said electronic module, said heat dissipating standoff layer comprising thermally conductive material having openings therethrough so as to provide air pathways that permit thermal dissipation by both air flow and thermal conduction; heating said solder balls to a temperature to cause solder reflow to thereby make solder connections to said contact pads on said electronic module with said heat dissipating standoff layer acting to maintain the height of said solder balls during solder reflow; and applying a sufficient compression force to said electronic module and said substrate to mechanically clamp said heat dissipating standoff layer therebetween with said heat dissipating standoff layer providing sufficient resisting force so as to cause substantially zero pressure to be applied to said solder connections.