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:
May. 08, 1990
Filed:
Jul. 26, 1988
Applicant:
Inventor:
Kiyoshi Ishibashi, Itami, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
357 46 ; 357 53 ;
Abstract
A Darlington power transistor comprising two transistors (Q.sub.1, Q.sub.2) has a clip diode (D.sub.i) for clipping high surge voltage. A field plate (9a) is formed in a surface of a channel cut region (8) existing in peripheral portion of the semiconductor chip, and is further extended by prescribed size (L.sub.B) toward a transistor forming region.