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:
Mar. 21, 1978
Filed:
Feb. 28, 1974
Applicant:
Inventor:
Noboru Horie, Kodaira, JA;
Assignee:
Hitachi, Ltd., , JA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
357 13 ; 357 36 ; 357 51 ; 357 86 ;
Abstract
A protective element for preventing electrostatic puncture of a semiconductor integrated circuit comprises a semiconductor substrate of one conductivity type, a first semiconductor region of the opposite conductivity type formed within a selected part of the surface of the semiconductor substrate, and a second semiconductor region of the one conductivity type formed within a selected part of the surface of the first semiconductor region, the first and second semiconductor regions being partially short-circuited. When a surge pulse voltage is impressed between the substrate and the second region, the element operates as a diode or a transistor so as to absorb the surge pulse.