Patent ID: 8390133

Claim:
A semiconductor device comprising: a chip mounting portion having a chip supporting surface and a back surface opposite to the chip supporting surface; a semiconductor chip having a front surface, a plurality of electrodes formed on the front surface, and rear surface opposite to the front surface, and mounted on the chip supporting surface of the chip mounting portion such that the rear surface of the semiconductor chip faces the chip supporting surface of the chip mounting portion; a plurality of leads arranged around the chip mounting portion; a plurality of wires electrically connecting the electrodes of the semiconductor chip with the leads, respectively; and a sealing member sealing the semiconductor chip, the leads and the wires, the sealing member having an upper surface, a lower surface opposite to the upper surface, and a plurality of side surfaces located between the upper surface and the lower surface; wherein each of the leads has a sealing surface, a mounting surface opposite to the sealing surface, an inner end surface located between the sealing surface and the mounting surface and facing the chip mounting portion, an outer end surface located between the sealing surface and the mounting surface and opposite to the inner end surface, and lead side surfaces each located between the sealing surface and the mounting surface and located between the inner end surface and the outer end surface, a first inner end part at an intersection of the sealing surface with the inner end surface, and a second inner end part at an intersection of the mounting surface with the inner end surface; wherein the wires are connected with the sealing surfaces of the leads, respectively; wherein the mounting surface of each lead is exposed from the lower surface of the sealing member; wherein the second inner end part is located closer to the chip mounting portion than the first inner end part, in a cross-section view; and wherein a width of the sealing surface in an intersecting direction intersecting with an extending direction of each of the leads is wider than that of the mounting surface.