Patent ID: 6963141

Claim:
A semiconductor package, comprising: a substrate; a die located and supported on said substrate with an adhesive layer between them; a plurality of signal transferring means which electrically connects said die to said substrate; a molding compound which seals and protect said die and said plurality of signal transferring means, wherein said molding compound has geometrically a recessed portion located at the top surface of the center part, wherein said die is located right below said recessed portion and fully covered by said molding compound, so that the thickness of said molding compound above said die is less than the thickness on the other portions of said molding compound; and a heat-spreading device which is attached atop said molding compound to conduct heat from said die to ambient air, wherein said heat-spreading device has a downward bump aligned to said recessed portion, and said molding compound exists between said downward bump and said die, said molding compound and said heat-spreading device being at least partially in surface-to-surface contact with one another; a thermally conductive adhesive applied between said molding compound and said heat-spreading device, wherein the thermally conductive adhesive is provided only between said substantially flat surface of said recessed portion of said molding means and said substantially flat surface of said heat-spreading means, the remainder of said heat-spreading means contact areas and said molding means contact areas being in direct contact; and a plurality of conductive means attached below said substrate to electrically connect a plurality of conductive traces on said substrate to external circuits.