Patent ID: 7724359
Filing Date: 2010-05-25
Classification: H01L,H05K

Abstract:
1. A method of fabricating a plurality of electronic entities having an electroless nickel immersion/gold (ENIG) structure, said method comprising the steps of: forming a first electrically conducting region overlying a substrate; forming a second region comprising nickel overlying said first electrically conducting region; determining the small particle density for a predetermined area of the surface of said second region for at least one of said electronic entities of said plurality, by analyzing said surface: and continuing toward completion of at least some of said electronic entities of said plurality if said small particle density of said predetermined area, for said at least one of said electronic entities, is not greater than a maximum acceptable value for said small particle density, said continuing toward completion including forming a third region overlying said second region, said third region comprising a further metal that is higher on the electromotive force (EMF) scale than nickel.