Patent ID: 8703532

Claim:
A method of manufacturing a resin sealed semiconductor device, comprising: mounting micro-balls onto a plurality of opening portions formed on a sheet, wherein the micro-balls each comprise a plastic particle core or metal particle core having a metal plating thereon and a spherical perimeter surface, and wherein the plurality of opening portions comprise one of columnar through holes or non-columnar through holes; mounting a semiconductor element onto a die pad portion of the sheet arranged in a region on a mounting side of the micro-balls except the opening portions; electrically connecting electrodes of the semiconductor element and the micro-balls with metal wires by forming wire bonds between the metal wires and a portion of the spherical perimeter surface of the metal plating of the micro-balls to couple the metal wire to the spherical perimeter surface; sealing the mounting side of the semiconductor element with an insulating resin; removing the sheet from a resin sealing body, thereby exposing a back surface portion of the semiconductor element and lower end portions of the spherical perimeter surface of the metal plating of the micro-balls to provide external connection electrodes; and separating the sealing body into individual semiconductor devices.