Patent ID: 6528876
Filing Date: 2003-03-04
Classification: H01L

Abstract:
A semiconductor package having a heat sink attached to a substrate comprising:a substrate having a first surface, a second surface opposing said first surface, a die-attach region formed on said first surface of said substrate, and a plurality of positioning holes formed on said substrate and arranged peripherally surrounding said die-attach region; a semiconductor chip mounted on said die-attach region and electrically connected with said substrate; a heat sink having a flat portion, a supporting portion connected to said flat portion for elevating said flat portion to a predetermined height above said semiconductor chip, and a plurality of positioning portions formed with said supporting portion for being engaged with the positioning holes of said substrate so as to securely fix said heat sink to said substrate; a plurality of electrical conductive elements disposed on said second surface of said substrate; and an encapsulation body which encapsulates said semiconductor chip and at least a portion of said heat sink; wherein each said positioning portion is smaller in diameter than its corresponding positioning hole; each said positioning portion has an upper portion with a diameter larger than a lower portion integrally connected therewith; and each said positioning hole has an upper portion with a diameter larger than a lower portion integrally connected therewith.