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May 2006

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Subject:
From:
Daniel Blass <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Daniel Blass <[log in to unmask]>
Date:
Thu, 11 May 2006 09:59:29 -0500
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You should definitely have global fiducials on your boards for SMT assembly.
 You may also need local fiducials near parts that need extra placement
accuracy.  It takes extra time to look at more fids so you need to balance
productivity and placement defect rates.  When you need local fids depends
on your products (board size, component size, lead and ball pitches) and
your placement equipment.  There isn't a general answer.  You really need to
address this question with your placement equipment vendor.  They should be
able to tell you what is best for the equipment you are using.

Regards,

Dan Blass
Process Research Engineer
Area Array Consortium
Surface Mount Technology Lab
Universal Instruments Corporation
http://www.uic.com/wcms/WCMS2.nsf/index/Global_Svc_Support_31.html

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