Patent ID: 8314478

Claim:
A semiconductor memory device, comprising: an organic substrate with an external connection terminal formed on one surface; a lead frame including a bonded portion to be bonded to the other surface of the organic substrate and an installation portion; a semiconductor memory chip mounted on the installation portion; and a resin mold having a substantially rectangular shape in a top view, configure to seal the organic substrate, the lead frame, and the semiconductor memory chip, with the external connection terminal exposed outwardly, wherein the organic substrate is formed separately into such a shape that in a top view, a non-overlapping portion of the organic substrate and the installation portion is larger than an overlapping portion of the organic substrate and the installation portion, when the organic substrate is bonded to the bonded portion, and the lead frame has a plurality of extensions extending at least to two or more sides of the resin mold, at least from one of the installation portion and the bonded portion.