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It can be. It is called wicking. The acceptance criteria are in IPC-A-600F
3.3.11 Wicking ............................................ 86
3.3.11.1 Wicking, Clearance Holes ................ 87
I don't have a copy here. But, those look pretty long. I think the
specification goes to electrical clearance.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jack Olson
Sent: Monday, October 01, 2007 12:56 PM
To: [log in to unmask]
Subject: [TN] Is This a BAD Thing?
I'm not accustomed to looking at reliability issues, (my designs are usually
so perfect... (grin)) so every time I see an X-Ray or a cross-section I get
nervous wondering what I'm actually seeing.
Can anyone explain what the following picture means?
http://www.frontdoor.biz/PCBportal/208what.jpg
onward thru the fog,
Jack
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