Patent ID: 8772836

Claim:
A semiconductor device comprising: a transistor element comprising a first nitride semiconductor layer and a second nitride semiconductor layer formed on the first nitride semiconductor layer, wherein a current flows between a source electrode formed on the second nitride semiconductor layer and a drain electrode formed on the second nitride semiconductor layer, the current flowing through a two-dimensional carrier gas layer formed near a heterojunction between the first nitride semiconductor layer and the second semiconductor layer, and ON/OFF operation is controlled by a voltage applied to a gate electrode formed on the second nitride semiconductor layer between the source electrode and the drain electrode; and a rectifying element comprising a cathode electrode identical to the drain electrode, and an anode electrode disposed on the second nitride semiconductor layer, wherein the current flows between the cathode electrode and the anode electrode, wherein a first auxiliary electrode and a second auxiliary electrode are formed on the second nitride semiconductor layer between the anode electrode and the source electrode in order from the anode electrode to the cathode electrode.