Patent ID: 8525351

Claim:
A substrate for use in production of a semiconductor device, comprising: an adhesive sheet having a base layer and an adhesive layer provided on the base layer; a die pad provided on the adhesive layer of the adhesive sheet and a plurality of electrically conductive portions provided around the die pad; and a semiconductor element loaded on the die pad, having electrodes, wherein each electrically conductive portion includes a metal foil and electrically conductive portion plating layers provided on both upper and lower ends of the metal foil, the die pad includes a die pad plating layer provided on the same plane as the lower electrically conductive plating layers of the electrically conductive portions, the die pad includes a bank portion that has a concave portion formed therein, the bank portion is formed as a continuous portion so as to surround the semiconductor element as viewed from a top of the semiconductor device, and the bank portion includes a metal foil and both upper and lower plating layers, the concave portion serves to receive the semiconductor element therein, and central portions of the metal foil in each of the electrically conductive portions and the bank portion are narrowed relative to both the upper and lower electrically conductive portion plating layers, and both the upper and lower plating lavers respectively.