Colin:
My understanding of this is that you need quite thick gold to bond aluminum to, thickness unobtainable with immersion gold, and one of the principal reasons that electroless gold is used, to obtain required thickness, which my fading memory seems to recall is ~ 50 micoinches, or 1.25 micron.
Rudy Sedlak
RD Chemical Company

--- On Thu, 3/11/10, colin mcvean <[log in to unmask]> wrote:

From: colin mcvean <[log in to unmask]>
Subject: [TN] Aluminium wire bonding
To: [log in to unmask]
Date: Thursday, March 11, 2010, 3:51 PM

We have an application which is asking for a ENIG finish with Ni spec of 2-4 um and Au of 0.05-0.1um.
 
What is the industry expectation of NI specification for Aluminium wirebonding? I think 2-4 is a little on the low side, and am worried about possible Nickel corrosion and poor bonding adhesion, especially if the Nickel is towards the lower side of the 2-4um.
 
Colin McVean


      

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