Patent ID: 8390001

Claim:
An electronic circuit device comprising: (a) a silicon carbide-based normally-off type junction FET having a gate electrode, a source electrode, and a drain electrode; and (b) an element or an element group inserted between the gate electrode of the normally-off type junction FET and a gate drive circuit, wherein the element or the element group, in which elements have been coupled in parallel to each other, includes a capacitor and a diode whose anode is coupled to the gate electrode and whose cathode is coupled to the gate drive circuit, but does not include other parallel-coupled elements, and wherein when a voltage applied to the element or the element group is 12.5 V, a capacitance of the element or the element group is from ⅓ to 1/7 of a gate capacitance at the time when a gate voltage of the junction FET is 2.5 V.