On Sat, 10 Sep 2005 09:04:11 -0500, "Robert Young" wrote:

>
>You might try over at www.smta.org but I have doubts about "free"
>anything from them.  One very comprehensive book is "IPC-SM-782A" but
>the IPC gives nothing away.  Last time I purchased the book was in 2001
>and it was nearly $100 then.  But it did have just about everything you
>needed for creating land patterns for SMT as well as general guidelines
>for placement spacing, edge clearances, etc.  I don't believe it has BGA
>however.  Also, it may not have been updated in the last few years, IPC
>seems a little slow in that respect.
>

The IPC's 782A document has been replaced with IPC-7351. There's a
free viewer available for dowmload at:

http://www.pcblibraries.com/

Anything beyond the viewer costs money but the viewer itself is free.


Regards, Bob

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