Patent ID: 6946891

Claim:
A switching circuit device comprising: a first set of field effect transistors connected in series; a second set of field effect transistors connected in series; a common input terminal connected to a source electrode or a drain electrode of a transistor positioned at one end of the first set and connected to a source electrode or a drain electrode of a transistor positioned at one end of the second set; a first output terminal connected to a source electrode or a drain electrode of a transistor positioned at other end of the first set; a second output terminal connected to a source electrode or a drain electrode of a transistor positioned at other end of the second set; a first control terminal connected to gate electrodes of all the transistors of the first set; a second control terminal connected to gate electrodes of all the transistors of the second set; and a protecting element comprising an insulating region disposed between two high impurity concentration regions, wherein the protecting element is connected between the source or drain electrode of the transistor positioned at the one end of the first set and the gate electrode of the transistor positioned at the one end of the first set, between the source or drain electrode of the transistor positioned at the one end of the second set and the gate electrode of the transistor positioned at the one end of the second set, between the source or drain electrode of the transistor connected to the first output terminal and the gate electrode of the transistor connected to the first output terminal, or between the source or drain electrode of the transistor connected to the second output terminal and the gate electrode of the transistor connected to the second output terminal.