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. 17, 2007
Filed:
Mar. 18, 2004
Atsushi Honjoh, Tokyo, JP;
Takayuki Hiraoka, Kawasaki, JP;
Atsushi Honjoh, Tokyo, JP;
Takayuki Hiraoka, Kawasaki, JP;
Kabushiki Kaisha Toshiba, Minato-Ku, Tokyo, JP;
Abstract
A semiconductor device includes a protection circuit protecting a semiconductor integrated circuit from electrostatic discharge, the protection circuit has a detection circuit detecting the electrostatic discharge, a trigger circuit generating a trigger signal based on the output signal of the detection circuit, and a thyristor having a PNP transistor and an NPN transistor, and operating by the trigger signal from the trigger circuit, the PNP transistor having an emitter connected to a first terminal of the semiconductor device, the NPN transistor having an emitter connected to a second terminal of the semiconductor device and a collector connected to base of the PNP transistor. The protection circuit further has a switching element controlling the connected between the PNP and NPN transistors in accordance with the output signal of the detection circuit.