Patent ID: 8580609

Claim:
A method to manufacture a semiconductor device, comprising: providing a lower semiconductor package that comprises a first set of one or more semiconductor dies, providing a first interconnect on top of the first set of semiconductor dies, wherein the first interconnect comprises a set of one or more leads that each comprises a flat portion above the first set of semiconductor dies, forming a recess on a lower side of at least a portion of the flat portion to provide a transition portion above the recess and a step portion beside the recess, encapsulating the first interconnect and the first set of semiconductor dies in an encapsulant, grinding the encapsulant to remove the transition portion and expose at least a portion of the step portion from top of the encapsulant, providing an upper semiconductor package that is stacked on the lower semiconductor package, the upper semiconductor package comprises a second set of one or more semiconductor dies, wherein the upper semiconductor package is electrically coupled to the lower semiconductor package via the exposed portion of the step portion.