Patent ID: 8232634

Claim:
A semiconductor device, comprising: a board having a first main surface, a plurality of connecting terminals formed on the first main surface, a second main surface opposite to the first main surface, a plurality of lands formed on the second main surface, a plurality of first through-holes each reaching to one of the first and second main surfaces from the other, and a second through-hole reaching to one of the first and second main surfaces from the other and arranged between the first through-holes; a heat sink having an upper surface, a plurality of pins formed on the upper surface, and a lower surface opposite to the upper surface, and disposed on the second main surface of the board such that the upper surface of the heat sink faces the second main surface of the board and such that the pins are arranged inside of the first through-holes, respectively; a semiconductor chip having a plurality of electrodes, and mounted on a part of the upper surface of the heat sink, which is exposed from the second through-hole; a plurality of wires electrically connected the electrodes of the semiconductor chip with the connecting terminals of the board; and a plurality of external terminals formed on the lands, respectively.