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Subject:	Re: Fiducials and HDI
From:	"d. terstegge" <[log in to unmask]>
Reply To:	TechNet E-Mail Forum.
Date:	Thu, 5 Oct 2000 16:52:48 +0100
Content-Type:	text/plain
Parts/Attachments:	text/plain (56 lines)

Hi Jim,

One solution could be to place the local fiducials underneath the components. Another solution: don't use them.
And do you really need a 0.150 (inch ?) keep out area ? 
 
Kind regards,

Daan Terstegge
SMT Centre
Signaal Communications
Unclassified mail
Personal Website: http://www.smtinfo.net

>>> Jim Kittel <[log in to unmask]> 10/05 3:25 pm >>>
TechNetters,

With so much emphasis on reducing circuit board feature sizes by use of
micro BGA's, micro lead frames, micro vias, etc. the use of local fiducials
becomes a real burden.  For example, our typical fiducial is a 0.048 circle
with a 0.150 keep out area.  This keep out area is approaching the size of
flash memories, micro BGA's, 0402 chips, etc.

Has anyone figured out a way to work around this local fiducial problem?  Is
anyone grouping these parts into some kind of symmetric clusters?  Any
ideas?

Jim Kittel

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