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Date: | Fri, 6 Jul 2012 09:22:45 -0400 |
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I agree. I have seen dendrites grow under solder mask from on conductor to
another, and from a PTH to a conductor, under solder mask.
If the residue were benign, until exposed to water, and the coating were to
protect it from exposure, it could help.
Still, I am skeptical, that it would reduce risk of failure. It would need
to be a designed process, not a band aid.
It might make things worse.
Guy
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Graham Naisbitt
Sent: Friday, July 06, 2012 8:23 AM
To: [log in to unmask]
Subject: Re: [TN] Copper Dendrites
Hi Neil
I stand by my earlier posting on this. Neither a solder resist nor a
conformal coating will PREVENT dendrites, they might delay it for a while,
but then what is lurking and festering underneath..just when you thought it
was safe to go back in the water!?
Graham Naisbitt
On 5 Jul 2012, at 19:50, Neil Atkinson wrote:
> Thanks everyone for comments so far - haven't been on Technet for a while
so it was good to get such good responses.
>
> Really miss Werner for questions like this...
>
> Actually we have never seen a failure for dendrites; however, we have a
customer who has a past problem with another supplier due to dendrites on
PCBs and as a result wants us to cover vias with solder resist or conformal
coating.
>
> Tha,
>
> Neil
>
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