Patent ID: 6586846
Filing Date: 2003-07-01
Classification: H01L

Abstract:
A structure for mounting one or more Integrated Circuit chips by creating an interface substrate overlying a metal substrate, said structure containing:a metal substrate, said metal substrate having a first surface and a second surface; a layer of epoxy with a thickness between about 0.5 mils and 3 mils deposited over said first surface; a thin film interconnect layer deposited over of said layer of epoxy, thereby forming a first layer of an interconnect substrate; a Build Up Multilayer (BUM) layer created over said interconnect layer, thereby forming a second layer of said interconnect substrate; a coating over said BUM layer as a solder mask; metal pads within said BUM layer created by etching, thereby creating openings for BGA solder connections; one or more openings for insertion of said one or more IC chips created by masking and etching said second surface of said metal substrate, thereby furthermore creating exposed portions of said epoxy within said openings; openings selectively created in said exposed epoxy, thereby providing electrical access and heat transfer to said interconnect substrate for said one or more IC chips; individual IC device substrates created by subdividing said metal substrate; a layer of adhesive containing thermally conductive epoxy, created by coating said exposed epoxy of said individual IC device substrates for the wire bond die while the adhesive is not required for the flip chip; one or more IC chips inserted into said one or more openings for the insertion of said wire bonded IC chips in said individual IC device substrates, whereby said IC chips overlay said adhesive coating; electrical connections for said IC device chips to said selectively created openings in said epoxy by wire bond or reflow solder for the flip chip case; a molding compound inserted over said one or more IC chips and within said one or more openings for the insertion of said IC chips; and solder balls inserted and attached to said BGA solder connections.