Patent ID: 6706561
Filing Date: 2004-03-16
Classification: H01L,Y10T

Abstract:
A method for fabricating a leadframe structure comprising a chip mount pad and a plurality of lead segments, each having a first end near said mount pad and a second end remote from said mount pad, comprising the steps of:forming said structure from a sheet-like starting material; plating a layer of nickel on said leadframe; selectively masking said second segment ends, thereby leaving said chip pad and said first segment ends exposed; selectively plating a layer of palladium on said nickel layer on said exposed chip pad and segment ends in a thickness suitable for bonding wire attachment; selectively masking said chip pad and said first segment ends, thereby leaving said second segment ends exposed; and selectively plating a layer of tin onto said nickel layer on said exposed segment ends in a thickness suitable for parts attachment.