The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 21, 1987
Filed:
Mar. 07, 1985
Shuroku Sakurada, Katsuta, JP;
Yasuhiko Ikeda, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A gate turn-off thyristor is provided having a semiconductor substrate, an anode electrode, a cathode electrode and a gate electrode. The semiconductor substrate includes a P emitter layer connected to the anode electrode, an N base layer adjacent to the P emitter layer, a P base layer adjacent to the N base layer and connected to a gate electrode, and an N emitter layer adjacent to the P base layer and connected to the cathode electrode. In order to improve in its current cut-off performance, the semiconductor substrate further includes a P-type layer provided between the P emitter layer and the N base layer and having the impurity concentration lower than that of the N base layer.