,
        Earl,

        I see where you're going and can find considerable empathy.
        Decided long ago to *not* do just another ad-hoc yet work-
        able and continuously improved library.

        Consider parts footprints in shades of qualification:

        - Generic (vendor supplied, who knows what info drove it)
        - Broad Concensus (IPC)
        - Narrow Concensus (OEM specific,w/buyin from 2+ CMs)
        - Factory specific (published by each CM or OEM)

        As 3rd party types, the burden of setting up & maintaining
        multiple libraries this way is considerable.  Having done
        so, I've never once had an "Atta Boy" from a CM for giving
        them designs set up to their spec, exactly, versus sending
        in one to IPC spec.  Seems if they want the business then
        the IPC standards are sufficient to allow them to proceed.

        The big problem w/782 is it takes so long for a broad con-
        cencus to emerge, get argued, and get published.  The next
        issue regards space around components, even a 0402 casts a
        large shadow in placement and ICT boundaries.  Like the CM
        specs that never get enforced, we see a lot of people tend
        to throw out the boundaries and still succeed.

        C'ya!
--

      Jeff Seeger                         Applied CAD Knowledge Inc
      Chief Technical Officer                  Tyngsboro, MA  01879
      jseeger "at" appliedcad "dot" com                978 649 9800

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