Patent ID: 6246015
Filing Date: 2001-06-12
Classification: H01L

Abstract:
A printed circuit board (PCB) for a ball grid array (BGA) semiconductor package, comprising:a dielectric substrate having top and bottom surfaces;a conductive circuit pattern formed on the top and bottom surfaces of the substrate, each circuit pattern comprising a plurality of conductive traces, at least one of the traces comprising a ground trace;a chip mounting plate centrally disposed on the top surface of the substrate for mounting a semiconductor chip thereon;a plurality of conductive via holes formed in the substrate and electrically connecting selected ones of the circuit patterns on the top and bottom surfaces of the substrate to each other;a solder mask formed over each of the circuit patterns on the top and bottom surfaces of the substrate, the mask electrically isolating the conductive traces from each other and from the environment;a plurality of simulation holes formed on the PCB at positions around the circuit patterns, the holes defining a package separation line on the substrate; and,grounding means formed on the substrate and electrically connected to the ground trace, the grounding means making electrical contact with at least one grounded mold during molding of the package, and being positioned outside of the separation line such that the grounding means is separated from the package when the package is separated from the substrate.