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:
Jul. 27, 2004
Filed:
Oct. 09, 2002
Applicant:
Inventor:
David D. Litfin, Houlton, WI (US);
Assignee:
PolarFab LLC, Bloomington, MN (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L 2/362 ;
U.S. Cl.
CPC ...
H01L 2/362 ;
Abstract
The present invention provides an over-voltage protection circuit using a Zener diode and transistor. By disposing at least one junction region of the Zener diode outside of the base region of the transistor, a tight (i.e., with small variation) and suitably high reverse breakdown voltage is achieved.