BLM -

Although I couldn't find it in the new IPC-SM-782 (Surface Mount Land
Patterns), the old, original version of 782 (March 1987) had the spacing at
0.025" (0.63mm), via pad to smt pad on page 65.  Ed/

Ed Valentine
Electronics Manufacturing Solutions
8612 Mourning Dove Road, Raleigh, NC 27615
Phone: (919) 270-5145, Fax: (919) 847-9971
Email: [log in to unmask]
Website: http://www.ems-consulting.com

----- Original Message -----
From: Brad L. Matthies <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, March 31, 2000 1:27 PM
Subject: [TN] Via Hole Placement.


> TN,
>
> We are experiencing some manufacturing problems (solder bridging) and
> have linked them to via hole placement.  The particular assembly we are
> manufacturing has multiple via holes that are within approximately 15
> Mils of SMT lands.  Does anyone have a resource that spells out safe
> distances of via holes to SMT lands that they can pass along?  We are
> getting ready to approach the design group for this product and are
> looking for a qualified resource of information that we can use as well
> as the design group.
>
> Thanks,
> BLM
>
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