Patent ID: 6376908
Filing Date: 2002-04-23
Classification: H01L,H05K

Abstract:
A semiconductor plastic package structured by fixing a semiconductor chip on one surface of a printed circuit board, connecting a semiconductor circuit conductor to a signal propagation circuit conductor formed on a printed circuit board surface in the vicinity thereof by wire bonding, at least connecting the signal propagation circuit conductor on the printed circuit board surface to another signal propagation circuit conductor formed on another surface of the printed circuit board or a connecting conductor pad of a solder ball with a through-hole conductor, and encapsulating the semiconductor chip with a resin,the printed circuit board having a metal sheet of nearly a same size as the printed circuit board and nearly in a center in a thickness direction of the printed circuit board, the metal sheet being insulated from front and reverse circuit conductors with a heat-resistant resin composition, the metal sheet being provided with at least one clearance hole having a diameter greater than a diameter of a through hole, the through hole being provided in the at least one clearance hole, and the through-hole being insulated from the metal sheet with a resin composition, at least one additional through-hole being connected to the metal sheet, one surface of the metal sheet being provided with at least one protrusion portion which is of a same size as the semiconductor chip and exposed on a surface, the semiconductor chip being fixed on the at least one protrusion portion, and another surface of the metal sheet being provided with a protrusion surface exposed for diffusing heat.