Patent ID: 8114710

Claim:
A manufacturing method of a semiconductor device, in which the semiconductor device includes: a semiconductor chip; a first conductor section joined to a first principal surface of the semiconductor chip; a second conductor section joined to a second principal surface of the semiconductor chip on the opposite side to the first principal surface; and an encapsulation resin section sealing the semiconductor chip and part of the first and second conductor sections, and in the semiconductor device, a front surface of the first conductor section is exposed from a first surface of the encapsulation resin section and a front surface of the second conductor section is exposed from a second surface of the encapsulation resin section on the opposite side to the first surface, the manufacturing method comprising the steps of: (a) mounting the semiconductor chip over the first conductor section with a first film member and a first bonding material in-between so that the first principal surface of the semiconductor chip is opposed to the first conductor section; (b) mounting the second conductor section over the second principal surface of the semiconductor chip with a second film member and a second bonding material in-between; (c) curing the first bonding material and the second bonding material to join the first conductor section to the first principal surface of the semiconductor chip and to join the second conductor section to the second principal surface of the semiconductor chip; and (d) after step (c), forming the encapsulation resin section sealing the semiconductor chip, the first conductor section, and the second conductor section, wherein the first and second bonding materials in steps (a) and (b) are paste-like bonding materials of solder paste or silver paste, wherein step (a) includes: (a1) placing the first film member over the first conductor section; (a2) placing the first bonding material in a position over the first conductor section where the first bonding material does not overlap the first film member; and (a3) mounting the semiconductor chip over the first conductor section with the first film member and the first bonding material in-between, and wherein the first and second film members are less prone to deformation under load than the first and second bonding materials.