Patent ID: 7518228

Claim:
A semiconductor device which is mountable over a mounting substrate and includes a power amplifying circuit, comprising: a wiring substrate having a main surface and a back surface which is opposite to the main surface, the back surface having four edges in a plan view; a mount pad disposed over the main surface of the wiring substrate; a semiconductor chip having an amplifying element of the power amplifying circuit, mounted over the mount pad; a via hole formed under the mount pad and inside the wiring substrate; a conductor film in the via hole; a plurality of first electrode terminals arranged along the four edges of the back surface of the wiring substrate; and a plurality of second electrode terminals arranged inside the plurality of the first electrode terminals over the back surface of the wiring substrate, one of the second electrode terminals being electrically connected to the mount pad via the conductor film in the via hole; wherein the plurality of first electrode terminals include terminals used for inputting and outputting of signals for the power amplifying circuit; the plurality of second electrode terminals are used for ground potential supply to the power amplifying circuit; an area of each of the first electrode terminals is smaller than that of each of the second electrode terminals; and the semiconductor device is mountable over the mounting substrate via solder formed on the plurality of first and second electrode terminals.