Patent ID: 8049313

Claim:
A semiconductor package, comprising: a substrate; an IC die attached on a first surface to the substrate and electrically connected to the substrate; and a heat spreader attached to a second surface of the IC die, the heat spreader comprising: a heat absorbing portion attached to the second surface of the IC die, a heat dissipating portion having a bottom surface that faces the substrate and a top surface opposite to the bottom surface, wherein the top surface has a recessed periphery, wherein a central portion of the bottom surface is coupled to the heat absorbing portion, and wherein the heat spreader has a generally T-shaped cross-section with the heat absorbing portion forming a vertical base portion of the T-shape and the heat dissipating portion forming a horizontal portion of the T-shape, and a first mold compound comprising a thermosetting resin disposed in the recessed periphery for preventing die cracking during a later performed molding operation, and a second mold compound covering the IC die, a portion of the substrate and a portion of the heat spreader, wherein the top surface of the heat spreader is exposed.