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. 15, 2003
Filed:
Dec. 07, 2000
Shinko Electric Industries Co., Ltd., Nagano, JP;
Abstract
A semiconductor device lead frame made of copper or a copper alloy used for a resin sealing type semiconductor device, comprising a lead frame body made of copper or a copper alloy, a double-layer under plating film formed on the lead frame body and comprising a lower layer made of zinc or a copper-zinc alloy and an upper layer made of copper having a thickness of 0.02 to 0.4 &mgr;m and a precious metal plating film formed on at least a wire bonding portion of an inner lead of the copper upper layer of the under plating film. This lead frame is excellent in adhesion with a sealing resin, is free from contaminate a precious metal plating solution (particularly a silver plating solution), has a good appearance of the precious metal plating film, is excellent in corrosion resistance and moisture resistance, and has a good appearance and adhesion of an external solder plating film.