Patent ID: 8293575

Claim:
A manufacturing method of a semiconductor device, comprising the steps of: (a) providing a mold die including a first die having a first surface, and a second die formed with a recessed portion and having a second surface facing to the first surface; (b) disposing a first base member, having a first main surface, a plurality of first electrode pads formed on the first main surface, a plurality of first wires coupled individually to the first electrode pads, a plurality of first lands coupled individually to the first wires, and a first back surface opposing to the first main surface, in the recessed portion of the second die such that the first main surface faces to the recessed portion of the second die; (c) after the step (b), disposing a second base member, having a second main surface, a plurality of second electrode pads formed on the second main surface, a plurality of second wires coupled individually to the second electrode pads, a plurality of second lands coupled individually to the second wires, and a second back surface opposing to the second main surface and has a semiconductor chip mounted over the second main surface, between the first die and the second die such that the second main surface faces to the first back surface of the first base member; (d) after the step (c), clamping the second base member with the first die and the second die; (e) after the step (d), supplying a resin between the first base member and the second base member, and forming a sealed body between the first base member and the second base member; (f) after the step (e), retrieving the first base member and the second base member each formed with the sealed body from between the first die and the second die; (g) after the step (f), forming through holes from the first lands of the first base member toward the second lands of the second base member, and exposing the second lands; and (h) after the step (g), forming a conductive member in each of the through holes.