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:
Sep. 15, 2015
Filed:
Jan. 29, 2014
Seiko Instruments Inc., Chiba, JP;
Takeshi Koyama, Chiba, JP;
Tomomitsu Risaki, Chiba, JP;
SEIKO INSTRUMENTS INC., , JP;
Abstract
Provided is a semiconductor device which uses a comb-like N-type MOS transistor as an ESD protection element and is capable of uniformly operating the entire comb-like N-type MOS transistor. By adjusting a length L of a gate electrode of the N-type MOS transistor used as the ESD protection element in accordance with the distance from a contact for fixing a substrate potential, which is provided on a guard ring around an outer periphery, respective portion of N-type MOS transistor represented as a comb teeth uniformly enter snap-back operation, permitting avoidance of local concentration of current and obtainment of a desired ESD tolerance.