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Date: | Thu, 26 Apr 2007 10:44:49 -0600 |
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I agree with John, that I don't mind the via being plated shut. (Don't
place more restrictions on the fabricator than necessary). HOWEVER,
that should not be confused with a via being closed off by debris or
nodules and then plated over, making it appear plated shut! If anything
blocks that via during plating, the inside of the via will not be
sufficiently plated and will cause latent open failures.
-Ryan
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of John Foster
Sent: Thursday, April 26, 2007 9:37 AM
To: [log in to unmask]
Subject: Re: [TN] "plated shut vias"
I am a printed circuit board designer and I will tell you that
quite often when I am speaking to a fabricator and I need to take
the vias way down say 8 mils or below the first thing I hear from the
fabricator is "Is it okay if the vias are plated shut"
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of David Greig
Sent: Thursday, April 26, 2007 8:39 AM
To: [log in to unmask]
Subject: [TN] "plated shut vias"
Hi List,
Yet again I've come across fabrication notes on other pcb designers
notes that specify that thru board via's may be plated shut.
Is there any historical reason for this, or is it just hysterical?
I would be rather concerned to see a closed via that is neither blind or
filled, mental images of trapped process chemistry etc.
Best Regards
David Greig
______________________________
GigaDyne Ltd
5 Albany Business Centre
Gardeners Street
Dunfermline KY12 0RN
United Kingdom
t: +44 (0)1383 624 975
www.gigadyne.co.uk
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