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:
Dec. 04, 2018
Filed:
Mar. 31, 2016
Macronix International Co., Ltd., Hsinchu, TW;
MACRONIX INTERNATIONAL CO., LTD., Hsinchu, TW;
Abstract
An ESD protection apparatus includes a semiconductor substrate, a first well, a second well, a first doping region, a second doping region, a third doping region and a fourth doping region. The first well and the second well respectively having a first conductivity and a second conductivity are disposed in the semiconductor substrate. The first doping region having the second conductivity is disposed in the first well. The second doping region having the first conductivity is at least partially disposed in the first well and surrounds the first doping region. The third doping region and the fourth doping region respectively having the first conductivity and the second conductivity are disposed in the second well. The first doping region, the third doping region, the first well and the second well are integrated to form a first parasitic BJT and a second parasitic BJT that have different majority carriers.