Patent ID: 7728421

Claim:
A semiconductor device comprising: a wiring board having a first main surface, a first back surface opposite to the first main surface, a plurality of wire bonding portions formed on the first main surface, a plurality of land portions formed on the first back surface, a plurality of via portions each formed from the first main surface toward the first back surface, and a plurality of conductive portions formed in the plurality of via portions, respectively, wherein the plurality of wire bonding portions are electrically connected with the plurality of land portions through the plurality of conductive portions, respectively; a semiconductor chip mounted on the first main surface of the wiring board, the semiconductor chip having a second main surface, a second back surface opposite to the second main surface, and a plurality of electrode pads formed on the second main surface; a plurality of wires electrically connecting the plurality of electrode pads of the semiconductor chip with the wire bonding portions of the wiring board; a resinous member for sealing the semiconductor chip and the plurality of wires; and a plurality of external terminals connected to the land portions, respectively, wherein the plurality of via portions have a first via portion and a second via portion; wherein the plurality of land portions have a first land portion electrically connected with a first conductive portion formed in the first via portion, and a second land portion electrically connected with a second conductive portion formed in the second via portion; wherein the first via portion is arranged outside of the first land portion in a plane view; wherein the first conductive portion is electrically connected with the first land portion through an extension wiring formed on the first back surface of the wiring board; wherein the second via portion is arranged inside of the second land portion in a plane view; wherein a pitch (P) between the plurality of bonding portions adjacent to each other is less than a diameter (L) of each of the plurality of via portions; and wherein the diameter (L) is less than a diameter (M) of each of the plurality of land portions.