Patent ID: 8629454

Claim:
A semiconductor device comprising: a substrate; a nitride semiconductor layer that is provided on the substrate and includes a channel layer and an electron supply layer; a source electrode, a gate electrode and a drain electrode provided on the nitride semiconductor layer; an insulating layer that covers at least a side face and a top face of the gate electrode and a surface of a part of the nitride semiconductor layer between the gate electrode and the drain electrode; and a field plate that is located between the gate electrode and the drain electrode on the insulating layer, a width of a region of the field plate between an edge of the field plate of a side of the drain electrode and an edge of the side face of the insulating layer covering a side face of the gate electrode of a side of the drain electrode being 0.1 μm or more, a first distance between an edge of the field plate of the side of the drain electrode and an edge of the drain electrode of the side of the gate electrode in a contact face between the nitride semiconductor layer and the drain electrode being 3.5 μm or more, an operating frequency of the semiconductor device being 4 GHz or less.