Patent ID: 6596212
Filing Date: 2003-07-22
Classification: B29C,H01L

Abstract:
A method of molding a plastic body, the method comprising:mounting a semiconductor die on a substrate to form an assembly thereof; providing a mold having parts that engage each other at respective interfacial surfaces thereof, at least some of said parts defining a first cavity upon engagement; providing a shim having a selected thickness and an opening through an interior portion thereof; interposing said shim between said interfacial surfaces of said mold parts such that said mold parts are spaced apart by said thickness of said shim, and such that said shim opening and said first cavity are juxtaposed, thereby forming a second cavity larger than said first cavity; interposing said assembly between said interfacial surfaces of said mold parts such that said die and a portion of said substrate reside within said second cavity; engaging an alignment feature in said shim with corresponding alignment features in said substrate and said mold parts to align said shim, said substrate, and said mold parts with each other; and, filling said second cavity in said mold with a plastic molding compound to form said plastic body therein over said substrate and said die, said plastic molding compound running to said second cavity on said shim through a inner bounded by said shim and a said interfacial surface.