Patent ID: 8299603
Filing Date: 2012-10-30
Classification: H01L

Abstract:
1. A power semiconductor device in which transfer molding resin seals: a circuit substrate including a metallic heat dissipater and including a thermal conductive insulation layer joined to one surface of the metallic heat dissipater and including a wiring pattern provided on a surface of the thermal conductive insulation layer, which surface is opposite to a surface, of the thermal conductive insulation layer, joined to the metallic heat dissipater; a power semiconductor element joined to an element mounting portion of the wiring pattern; and a side surface of a cylindrical external terminal communication section which is provided on the wiring pattern electrically connected to the power semiconductor element and to which an external terminal is inserted and connected, wherein: the cylindrical external terminal communication section is provided so as to be substantially perpendicular to the surface on which the wiring pattern is formed; an outer surface of the metallic heat dissipater and a top portion of the cylindrical external terminal communication section is exposed from the transfer molding resin; the transfer molding resin is not present within the cylindrical external terminal communication section; and a diameter of the external terminal communication section at a midpoint of the external terminal communication section is smaller than a diameter of the external terminal communication section at lowest and highest points of the external terminal communication section, the midpoint, lowest, and highest points of the external terminal communication section measured in a direction perpendicular to the surface on which the wiring pattern is formed.