Patent ID: 6287890
Filing Date: 2001-09-11
Classification: H01L

Abstract:
A method of mounting one or more Integrated Circuit chips by creating an interface substrate overlying a metal substrate, comprising the steps of:providing one or more IC chips said IC chips having been provided with pads for electrical connections;providing a metal substrate said metal substrate having a first surface and a second surface;cleaning said first surface of said metal substrate;depositing a layer of epoxy over said first surface;depositing a interconnect layer over the surface of said layer of epoxy thereby forming the first layer of an interconnect substrate;creating a Build Up Multilayer (BUM) layer over said interconnect layer thereby forming the second layer of an interconnect substrate;coating said BUM layer as a solder mask;exposing the metal pads within said BUM layer thereby creating openings for BGA solder connections;masking and etching said second surface of said metal substrate thereby creating one or more openings for the insertion of said one or more IC chips thereby furthermore exposing portions of said epoxy within said openings; selectively creating openings in said exposed epoxy thereby providing electrical access and heat removal to said interconnect substrate for said one or more IC chips;subdividing said metal substrate into individual IC chip substrates;coating said exposed epoxy of said individual IC chip substrates with a layer of adhesive for wire bond die whereby the adhesive is not required for the flip chip die;inserting said one or more IC chips into said one or more openings for the insertion of said IC chips in said individual IC chip substrates, said wire bonded IC chips overlay said adhesive coating;electrically connecting said IC chips to said selectively created openings in said epoxy by wire bond or reflow solder for the flip chip case;inserting a molding compound over said one or more IC chips within said one or more openings for the insertion of said IC chips; andinserting and attaching solder balls to said BGA solder connections.