Patent ID: 7138296

Claim:
A method of manufacturing a semiconductor device comprising steps of: providing a board comprising an entire flat back face corresponding to a resin sealing area and a front face formed in sheet shape having designated thickness from said back face, the front face having projections formed of a metal, which is integral with the board, said projections formed by etching of the board and having (a) a bonding pad provided at an area surrounded with a contacting area to an upper die, (b) a wiring extended to a semiconductor element mounting area integrated with the bonding pad, and (c) an electrode provided in one body with the wiring; mounting a semiconductor element at said semiconductor element mounting area to electrically connect the semiconductor element to said bonding pad; placing said board on a lower die; filling resin into the space constructed with the board and said upper die; and dividing into a plurality of devices so that said projections are separated respectively by removing the board exposed at the back face of said resin filled into.