Patent ID: 6254923
Filing Date: 2001-07-03
Classification: H01L,H05K,Y10T

Abstract:
A method of making an electrical interconnect assembly, said method comprising the steps of:providing a substrate having a metal wiring layer including a pattern of high melting temperature metal contact pads as part thereof;positioning a low melting temperature conforming layer, wettable to said contact pads, on selected ones of said metal contact pads;positioning a high melting temperature metal preform above said selected ones of said metal contact pads having said conforming layer thereon, and thereafter releasing said metal preform to drop onto said conforming layer on said selected ones of said metal contact pads; andheating said conforming layer on said metal contact pad to cause said conforming layer to conform to the surface of said contact pad and to cause said metal preform to connect to said contact pad.