Transfer molding method for forming integrated circuit package
AssigneeInternational Business Machines Corporation
InventorsLynda Boutin, Martial A. Letourneau, Real Tetreault
Life of this patent
Estimating the term…
Abstract
A method and resulting integrated circuit package is disclosed for encapsulating integrated circuit chips using transfer molding techniques in a form known as cavity packages. Each chip is positioned within a cavity surrounded by a laminate or printed wiring board which provides an array of contacts. The contacts provide for connections to an external circuit board/card and the contacts are also indirectly connected internally to the chip. The cavity, chip and some of the laminate, contacts and interconnections are on the same side of the carrier. Liquid plastic is forced into the cavity via a runner in a mold through a gate in the bottom of the carrier in order to encapsulate all of these components.
Claims9
A transfer molding method for manufacturing an integrated circuit package which includes a thermally conductive stiffener having a first side and a second side, and an integrated circuit device mounted on said first side of said thermally conductive stiffener, said thermally conductive stiffener also having mounted on said first side thereof a printed wiring board having a cavity therein, a plurality of contact pads mounted on said printed wiring board, said integrated circuit device mounted on said thermally conductive stiffener being positioned within said cavity of said printed wiring board, said thermally conductive stiffener including a gate therein opening into said cavity and communicating from said second side of said thermally conductive stiffener to said first side, said transfer molding method including the steps of:
- bringing a first platen of a mold adjacent said second side of said thermally conductive stiffener wherein said first platen has a runner for communicating with said gate in said thermally conductive stiffener;
- bringing a second platen of a mold adjacent said printed wiring board on said first side of the said thermally conductive stiffener, so as to form a seal with said printed wiring board and enclose said cavity having said integrated circuit device positioned therein;
- and
- providing a source of liquid encapsulant to said runner such that said liquid encapsulant is forced via said runner through said gate in said thermally conductive stiffener into said cavity formed by said second platen, said thermally conductive stiffener and said printed wiring board to thereby encapsulate said integrated circuit device.
Dependencies are inferred from the claim text.