Patent ID: 7911057

Claim:
An integrated circuit device (IC) assembled on a package substrate and encapsulated in a molding compound, the IC device comprising: a semiconductor die having topside surface and an underside surface, the topside surface having a circuit pattern, the circuit pattern including contact pads in a predetermined arrangement; a package substrate with a length and width, the package substrate having bump pad landings, the pad landings in an arrangement corresponding to the predetermined arrangement of the contact pads of the circuit pattern, the bump pad landings having connection traces coupling the pad landings to external contact regions in the package substrate; and an interposer layer sandwiched between the semiconductor die and the package substrate, the interposer layer including randomly distributed mutually isolated conductive columns of spherical particles embedded in an elastomeric material, wherein the interposer layer is subjected to a compressive force from pressure exerted upon the underside surface of the semiconductor die, the compressive force deforming the interposer layer causing the conductive columns of spherical particles to electrically connect the contact pads of the circuit pattern with the corresponding bump pad landings of the package substrate; wherein the compressive force is obtained from a metal clip in contact with the underside surface of the semiconductor die, and the metal clip having a length spanning the length and width of the package substrate and having a height less than the combined thickness of the semiconductor die, the interposer fabric, and the package substrate, such that when the metal clip is engaged with the package substrate, the metal clip provides the compressive force.