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February 2004

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Subject:
Re: Annular rings for plated through holes
From:
Franklin D Asbell <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 9 Feb 2004 08:11:53 -0600
Content-Type:
text/plain
Parts/Attachments:
text/plain (19 lines) 
Board design actually dictates annular ring on internal layers.

If there are traces off vias in internal layers then yes of course, annular
ring should be there, if the via connects only the top and bottom layers
then there is no need for annular ring internally, the ring is there for
support in connecting traces to hole/via walls.

Franklin

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