Patent ID: 6040598
Filing Date: 2000-03-21
Classification: H01L

Abstract:
A high-breakdown-voltage semiconductor apparatus comprising:a first-conductity-type base layer;a second-conductivity-type base layer formed on a surface of the first-conductivity-type base layer;a first-conductivity-type source layer formed on a surface of the second-conductivity-type base layer;a gate electrode provided over that portion of the second-conductivity-type base layer, which is interposed between the first-conductivity-type source layer and the first-conductivity-type base layer, with a gate insulation film interposed between the gate electrode and the interposed portion of the second-conductivity-type base layer;a second-conductivity-type drain layer formed on a surface of the first-conductivity-type base layer, which is opposed to the surface thereof on which the second-conductivity-type base layer;a drain electrode put in contact with the second-conductivity-type drain layer; anda source electrode put in contact with the first-conductivity-type source layer and the second-conductivity-type base layer,wherein when a gate capacitance of that portion of the gate electrode, under which a channel is formed, is Cg [F],a resistance in a channel length direction of that portion of the gate electrode, under which the channel is formed, is Rg [.OMEGA.],a threshold voltage, which is to be applied to the gate electrode and application of which permits flow of a drain current, is Vth [V],a voltage to be applied to the gate electrode to cut off the drain current is Voff [V], anda ratio of increase in the drain voltage per unit time at the time of cutting off the drain current is dV/dt [V/s],the following condition is satisfied:.vertline.Vth-Voff.vertline..gtoreq.0.5.multidot.Cg.multidot.Rg.multidot.(d V/dt)