Patent ID: 6869811

Claim:
A method of packaging a semiconductor device assembly having a semiconductor die having a plurality of bond pads thereon and having a portion thereof attached to a portion of a lead frame having a plurality of leads, at least one bond pad of the plurality of bond pads of the semiconductor die connected to at least one lead of the plurality of leads of the lead frame, comprising: forming a heat sink having a top surface and a bottom surface, each top and bottom surface having peripheral edges therearound; forming a substantially continuously formed protruding edge from the heat sink at the peripheral edges of the bottom surface of the heat sink; positioning the top surface of the heat sink adjacent to the semiconductor die having the plurality of bond pads thereon; placing the heat sink and semiconductor die in a transfer molding apparatus having the protruding edge formed at the peripheral edges of the bottom surface of the heat sink in contact with a portion of the transfer molding apparatus; and removing a dam from adjacent to a surface of the heat sink following an encapsulation of the semiconductor die and the heat sink.