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:
Jun. 24, 2003
Filed:
Feb. 11, 2002
Applicant:
Inventors:
Donald C. Abbott, Chartley, MA (US);
Douglas W. Romm, Sherman, TX (US);
Assignee:
Texas Instruments Incorporated, Dallas, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L 2/3495 ;
U.S. Cl.
CPC ...
H01L 2/3495 ;
Abstract
A leadframe for use with integrated circuit chips comprising a base metal having a plated layer of nickel fully covering the base metal and a plated layer of pure tin, only </=0.5 &mgr;m thick, on the nickel layer, selectively covering areas of the leadframe intended for attachment to other parts. For devices with gull-wing-shaped leads, these pre-plated tin areas cover only the external lead surface intended to face an outside part, and the lead edges. Further, a plated layer of palladium on the nickel layer selectively covers areas of the leadframe intended for bonding wire attachment.