Matthew Park wrote:
>
> (regarding component data sheets)
>
> I think not, component manufacturers are good at making
> components and not so for recommending land patterns for their
> components.  They don't count in everything that goes on to
> solder a simple SMT comp from the begining to the end.

        Here, Here!

        I totally agree with Mr Park on this, we call spec-
        sheet footprints "generic", to be counted on only as
        far as knowing the part can be attached.  Fine for
        1-100pc product life, usually manual methods.

        In our view, the next step of footprint qualification
        is "broad concensus" like IPC-SM-782, or maybe SMT Plus;
        next highest qualification being "narrow concensus"
        as seen in some larger OEMs (with a limited number of
        factories), highest being "factory specific" such as
        the major contract manufacturers and vertical OEMs will
        create.

        Seperating the many voices on the topic of footprints
        into these categories has helped us immensely in under-
        standing the chaos.

        Regards to all,
--

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

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