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July 1999

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Subject:
From:
Darrel Therriault <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 1 Jul 1999 10:27:02 -0700
Content-Type:
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text/plain (27 lines)
Rick,

Our suppliers like to see a .040" solid round, with a .020" annular ring
of keep out area beyond that to give the best contrast.  They also like
to see a .200" clearance from the round to any pad.  If the .200"
can't be maintained, they sometimes suggest a different shape fiducial
so they can identify it better with their vision system.  They usually
tell us this during a design review before final layout.

DT





At 08:20 AM 7/1/99 -0400, you wrote:
>To all,
>
>What is the recommended size and shape of a fiducial?
>I believe I.P.C. recommends 0.040" round.
>
>What are your thoughts?
>
>Frustrated
>
>

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