Patent ID: 6277672
Filing Date: 2001-08-21
Classification: H01L

Abstract:
A method of mounting one or more wire bond Integrated Circuit chips by creating an interface substrate overlying a metal substrate, comprising the steps of:providing one or more wire bond chips, said wire bond chips having been provided with pads for wire bond 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 first layer of dielectric over said first surface of said metal substrate;depositing an interconnect layer over said layer of dielectric thereby forming a first layer of an interconnect substrate;creating a Build Up Multilayer (BUM) layer over said interconnect layer thereby forming a second layer of an interconnect substrate;masking and etching said second surface of said metal substrate and thereby creating one or more openings for insertion of said one or more wire bond chips, thereby furthermore exposing portions of said first layer of dielectric within said openings;selectively creating openings in said exposed first layer of dielectric, thereby providing interconnections to said interconnect substrate for said one or more wire bond chips;subdividing said metal substrate into individual wire bond substrates;coating said exposed first layer of dielectric of said individual wire bond substrates with a layer of adhesive;inserting said one or more wire bond chips into said one or more openings for insertion of said wire bond chips in said individual wire bond substrates whereby said wire bond chips overlay said adhesive coating;wire bonding said wire bond chips to said selectively created openings in said first layer of dielectric, thereby wire bonding said wire bond chips to said interconnections having been exposed by said selectively created openings in said exposed first layer of dielectric;inserting a molding compound over said one or more wire bond chips within said one or more openings for insertion of said wire bond chips;coating said BUM layer as a solder mask;exposing metal pads within said BUM layer thereby creating openings for solder connections of solder balls; andinserting and attaching solder balls to said solder connections.