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:
Oct. 01, 2002
Filed:
Dec. 04, 2000
Kunio Watanabe, Sakata, JP;
Kazuhiko Okawa, Chino, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
The semiconductor device has an insulated-gate field-effect transistor (MOS transistor), a bipolar transistor, and a Zener diode. The MOS transistor is formed in a well of a first conductive type (p-type) and has a gate insulation layer, a gate electrode, side wall insulation layers, and second conductive type (n-type) of source and drain regions. The bipolar transistor has the drain region as a collector region, the well as a base region, and an n-type impurity-diffusion layer isolated from the drain region as an emitter region. The Zener diode is formed by the junction of an n-type impurity-diffusion layer continuous with the drain region and a p-type impurity-diffusion layer. The source and drain regions have a silicide layer formed on the surface thereof. A protection layer is formed on the surface of the n-type impurity-diffusion layer of the Zener diode.