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August 2007

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Subject:
From:
"Stadem, Richard D." <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Stadem, Richard D.
Date:
Wed, 15 Aug 2007 10:11:58 -0500
Content-Type:
text/plain
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text/plain (61 lines)
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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