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:
Apr. 28, 1998
Filed:
Aug. 09, 1996
Hiroshi Okada, Nukata-gun, JP;
Toshitaka Yamada, Okazaki, JP;
Nippondenso Co., Ltd., Kariya, JP;
Abstract
A surge protective device, which has a favorable surge-absorbing characteristic while avoiding increase in chip area and in process complexity, is disclosed. In a surge protective device having an ordinary planar bipolar transistor structure and having a voltage-regulation diode to absorb surge current by breakdown of a junction between an emitter region and base region thereof, a surface collector region thereof is shorted to the base region. Accordingly, when surge current is increased, a pn junction between a collector region and the base region is sufficiently forward biased, and thereby a backward transistor is formed. Surge current is sufficiently absorbed by the operation of the backward transistor.