Patent ID: 7577931

Claim:
A semiconductor device, comprising: a round power supply wiring; a plurality of power supply pads including a first power supply pad and at least one second power supply pad that are connected to internal power supply wirings through an internal circuit so that the first and second power supply pads are set to the same potential, the first power supply pad being bonded by a wire to a lead to which a supply voltage is applied and being connected to the round power supply wiring through a round power supply connection wiring; a signal pad from which electrostatic noise enters into the semiconductor device; and an input protection circuit connected between the signal pad and the internal circuit and connected to the round power supply wiring through a protection circuit power supply wiring; wherein the second power supply pad is not bonded by a wire to a lead to which a supply voltage is applied and is not connected to the round power supply wiring so that when electrostatic noise enters the signal pad, the electrostatic noise is discharged to the exterior of the semiconductor device without the electrostatic noise being led to the internal circuit.