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September 2006

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Subject:
From:
John Burke <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, John Burke <[log in to unmask]>
Date:
Mon, 18 Sep 2006 15:17:06 -0700
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Ho Ho ...........yes indeedy,

You will find if I am not mistaken if you section the vias on those nets
that you have at least one of them showing residual tin left behind during
stripping which has poisoned the enig process.

A question - do ANY pads at all on that net have a gold finish?

John

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dan Skweres
Sent: Monday, September 18, 2006 2:54 PM
To: [log in to unmask]
Subject: [TN] ENIG

We have, at times, had an outside plating service have difficulties with
plating of ENIG on our bare boards. The interesting anomaly we have
encountered is lack of plating on certain pads. They tell us there is
something on the surface of the pads but when they return the panels to us
we micro etch (copper looks beautiful) and all pads look similar in
appearance. We even took a panel and coated immersion white tin with out
problems. This tells me that there isn't any thing on the surface of the
copper. There is one thing I did leave out. The pads that aren't taking ENIG
all happen to be in the same net. Has anyone encountered this? It's almost
like there is a charge being created in certain nets not allowing the ion
exchange to happen. Could it be entrapped chemistry within vias? Any help
and/or direction would be greatly appreciated.
Thanks,


Dan Skweres
Engineering Manager
Bartlett Manufacturing
Phone:847-639-2102 Ext.#230
Fax:847-639-8838


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