A semiconductor device includes a first node receiving an external voltage, a second node receiving a grounding voltage, a protection circuit, and a device to be protected coupled in parallel between the first and second nodes, in which the protection circuit includes a lateral IGBT having an emitter coupled to the second node and an avalanche diode having an anode coupled to the collector of the lateral IGBT and a cathode coupled to the first node, and a clamp driving circuit coupled between the first and second nodes, and coupled to the gate of the lateral IGBT.