Patent ID: 7445963

Claim:
A method to assemble a semiconductor package comprising the following steps: providing a wafer including a plurality of semiconductor dies, each including an active surface with a plurality of die contact pads and a plurality of conducting means attached to the die contact pads, attaching a layer of first adhesive means on the back side of the wafer, attaching a release film to the first adhesive means, attaching a wafer sawing base tape to the release film, separating the dies from the wafer, removing the dies from the wafer sawing tape, providing a substrate comprising a plurality of contact pads on its upper surface and a second plurality of external contact areas on its bottom surface, mounting the die onto the substrate with its active surface facing the substrate so that the conducting means are attached to the upper contact areas, underfilling the die, removing the release film, and encapsulating the upper side of the die and the upper surface of the substrate by mold material.