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Fri, 17 Aug 2007 08:14:51 -0400 |
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Good Morning folks,
I created a graphic to illustrate our "punch through" problem as I don't
have any photographs of the failed board/part.
Steve Gregory has posted the illustration at
http://stevezeva.homestead.com/files/LPI_punch_thru.jpg. Thanks Steve.
Phil
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: Wednesday, August 15, 2007 11:12 AM
To: [log in to unmask]
Subject: Re: [TN] Solder mask as an insulator
Maybe. How many components, and what type? Can you post a picture on
Steve Gregory's wall? It is a lot easier to solve the puzzle if we can
see what the situation is.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Phil Nutting
Sent: Wednesday, August 15, 2007 9:59 AM
To: [log in to unmask]
Subject: [TN] Solder mask as an insulator
Let me start with, I know that we should not rely on the LPI solder mask
as an insulator. So I need recommendations for a simple and cost
effective solution.
Problem parameters; 0.062 thick FR-4 with 2 oz copper and LPI mask. PTH
components laying on traces that go under the parts. PTH parts are
shorting to the traces.
Our fab house is against adding a second layer of LPI mask. On face
value a second layer sounds good and easy, but I know there are issues
too long to list.
Short of raising the components above the board, applying an insulator
under the components or a new board layout is there a better way of
preventing this shorting problem?
Thanks in advance.
Phil Nutting
Design for Manufacturing Engineer
Kaiser Systems, Inc.
126 Sohier Road
Beverly, MA 01915
voice: 978-922-9300 x1310
fax: 978-922-8374
e-mail: [log in to unmask]
www.kaisersystems.com
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Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
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