Patent ID: 7728412

Claim:
A semiconductor device comprising: a semiconductor chip having a main surface, a back surface opposing to the main surface, and a plurality of electrodes formed on the main surface; a chip mounting part having a dimension, wherein the dimension of the chip mounting part is smaller than that of the semiconductor chip; a plurality of leads having a first main surface, a second main surface opposing to the first main surface, and arranged around the chip mounting part; a plurality of conductive wires electrically connecting the plurality of electrodes of the semiconductor chip with the second main surface of each of the plurality of leads, respectively; and a molded body sealing the semiconductor chip and the plurality of conductive wires; wherein each of the plurality of leads has a first portion and a second portion; wherein a length, in an extending direction, of the second portion is greater than a length, in the extending direction, of the first portion; wherein a thickness of the second portion is thinner than that of the first portion; wherein the second portion is arranged so that the second portion is opposed to the back surface of the semiconductor chip; and wherein each of the plurality of conductive wires is electrically connected to the second main surface in the first portion.