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. 22, 1989
Filed:
Jul. 14, 1987
Applicant:
Inventor:
Takeshi Kojo, Kyoto, JP;
Assignee:
Matsushita Electronics Corporation, Kadoma, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L / ; H01L / ; H01L / ;
U.S. Cl.
CPC ...
357 51 ; 357 14 ; 357 20 ; 357 52 ;
Abstract
In a semiconductor IC, a diode and a resistor for surge protection are integratedly formed in a p-type common island region laterally isolated from a p-type epitaxial layer by oxide film, by forming an n-type region of high impurity concentration to reach down to an n-type buried region and a resistor region, respectively; the IC has higher integration and larger junction area of the diode, and achieve better surge protection.