Patent ID: 6885063
Filing Date: 2005-04-26
Classification: H01L

Abstract:
1. A semiconductor device comprising: a first semiconductor region of a first conduction type with a relatively low impurity concentration, the first semiconductor region mainly determining a breakdown voltage of the device; a second semiconductor region of a second conduction type selectively provided in a surface portion of the first semiconductor region; a third semiconductor region of the first conduction type with a high impurity concentration selectively provided in a surface portion of the second semiconductor region; a high impurity region of the second conduction type covering a part of the third semiconductor region of the first conduction type with the high impurity concentration in the second semiconductor region; a fourth semiconductor region of the first conduction type with an impurity concentration higher than that of the first semiconductor region, the fourth semiconductor region being provided in contact with the first semiconductor region and apart from the second semiconductor region; a fifth semiconductor region of the first conduction type with an impurity concentration higher than that of the fourth semiconductor region, the fifth semiconductor region being provided in contact with the fourth semiconductor region and apart from the first semiconductor region; an insulator film provided along a channel region formed in the second semiconductor region between the first semiconductor region and the third semiconductor region; a first electrode holding the insulator film between the channel region and the first electrode; a second electrode in contact with the third semiconductor region and the second semiconductor region in common; and a third electrode in contact with the fifth semiconductor region, wherein, with respect to a linear expression x with values of x