Patent ID: 7579674

Claim:
A semiconductor device comprising: a chip mounting portion; a semiconductor chip mounted over said chip mounting portion, said semiconductor chip having a main surface and a plurality of electrodes formed on said main surface thereof; a plurality of suspension lead portions integrated with said chip mounting portion, respectively; a plurality of lead portions arranged around said chip mounting portion, each of said plurality of lead portions including one end portion facing to said chip mounting portion and an other end portion opposing to said one end portion, said plurality of lead portions including a first lead portion and a second lead portion arranged next to said first lead portion; a plurality of wires electrically connecting said plurality of electrodes of said semiconductor chip with said plurality of lead portions, respectively; and an encapsulating resin portion sealing said semiconductor chip and said plurality of wires, said encapsulating resin including an upper surface, a lower surface opposing to said upper surface, and side surfaces between said upper surface and said lower surface; wherein said first lead portion includes a first lower exposed surface exposed from said lower surface of said encapsulating resin at a peripheral portion of said encapsulating resin, and a first upper exposed surface opposing to said first lower exposed surface and exposed from said upper surface of said encapsulating resin at said peripheral portion of said encapsulating resin; wherein said second lead portion includes a second lower exposed surface arranged at said chip mounting portion side at a location different than said first lower exposed surface and exposed from said lower surface of said encapsulating resin, and a second upper exposed surface arranged at an opposite side of said second lower exposed surface and exposed from said upper surface of said encapsulating resin at said peripheral portion of said encapsulating resin; and wherein a width of said first lower exposed surface is larger than a width of said first upper exposed surface.