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:
Aug. 27, 2002
Filed:
Mar. 06, 1997
Applicant:
Inventor:
Ranadeep Dutta, Redondo Beach, CA (US);
Assignee:
International Rectifier Corporation, El Segundo, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L 2/358 ;
U.S. Cl.
CPC ...
H01L 2/358 ;
Abstract
The active area of a semiconductor die is surrounded by a plurality of concentrically spaced ring shaped P type diffusions. The diffusions have a low concentration produced by a total boron implant dose of from about 2E12 to 5E13 atoms/cm . Four to twelve rings are used to terminate an active area at a potential of 600 to 1200 volts with respect to the die street.