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August 2007

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Subject:
From:
Phil Nutting <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Phil Nutting <[log in to unmask]>
Date:
Wed, 15 Aug 2007 13:47:41 -0400
Content-Type:
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text/plain (98 lines)
Eddie,

By a "silkscreen block" can I assume you mean adding an area screened
onto the board during the component outline silk-screening step?  

Phil

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Eddie Rocha
Sent: Wednesday, August 15, 2007 1:15 PM
To: [log in to unmask]
Subject: Re: [TN] Solder mask as an insulator

How about using a silkscreen block between these traces and the
component
body?
Eddie,

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Phil Nutting
Sent: Wednesday, August 15, 2007 7:59 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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