Patent ID: 6097089
Filing Date: 2000-08-01
Classification: H01L,H05K

Abstract:
A semiconductor plastic package having a structure in which a metal sheet having a size nearly equal to the size of a printed wiring board is disposed nearly in the middle of the thickness direction of the printed wiring board, at least one semiconductor chip is fixed on one surface of the printed wiring board with a thermally conductive adhesive, the metal sheet is insulated from circuits on the front and reverse surfaces of the printed wiring board with a thermosetting resin composition, a circuit conductor formed on the surface of the printed wiring board and the semiconductor chip are connected with each other by wire bonding, a signal propagation circuit conductor on the surface of the printed wiring board and a circuit conductor formed on the reverse surface of the printed wiring board or a circuit conductor pad formed for connection to an external portion of said package with solder balls are at least connected with a through hole conductor insulated from the metal sheet with a resin composition, at least one through hole forms a direct junction with the metal sheet disposed as an inner layer, and at least the semiconductor chip, the bonding wire and the bonding pad are encapsulated,wherein a plurality of protrusions having the form of a cone or a frustum of a cone each are formed on that portion of at least one surface of the metal sheet which is within an area where the semiconductor chip is mounted, and tops of said metal protrusions are in contact with the thermally conductive adhesive or a metal foil.