Go to:  http://www.stevezeva.homestead.com/

Look at "plugged via" and  "plugged via bubble"

-Doug Corbett-

-----Original Message-----
From: Nishath Yasmeen [mailto:[log in to unmask]]
Sent: Friday, March 19, 2004 1:42 PM
To: 'TechNet E-Mail Forum.'; [log in to unmask]
Subject: RE: [TN] Plugged Via bubble
Importance: Low


Hi Doug, Can you send me Steve's web page and the link so I can look at
these pics.
Thanks!
Yasmeen

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Doug Corbett
Sent: Thursday, March 18, 2004 4:18 PM
To: [log in to unmask]
Subject: [TN] Plugged Via bubble

Technetters,

Do any of you have reliability data or other experience with plugged
vias
that are subsequently plated over?

Steve has been kind enough to agree to post pictures of the "defect" on
his
website.

The micro section photos of the voids in the plug-and-cap vias. These
were
taken at 10X magnification. The voids/bubbles average .005" in diameter,
almost round. Looking at the photos you can determine approximately how
large they are by noting that the drill hole diameter is .010 inches
drilled
with a 10-mil drill size.

What potential long-term reliability concerns are there, and is this
considered acceptable for Class 2 product.


Douglas Corbett
L-3 Communications / Communication Systems - West
Senior Manufacturing Engineer - Printed Circuit Boards
(801) 594-3153

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