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Reply To: | TechNet E-Mail Forum. |
Date: | Thu, 1 Jul 1999 12:44:38 -0400 |
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When asked or when I have the opportunity to give input before fab, I
specify 0.040" round SOLID with 0.150" dia soldermask clearance. Too
much bigger than 0.060" dia. you start to lose seach area size with
some machinery.
the worst type of fiducials that I typically have to deal with are
Donut type or using Vias for fiducials, since I am not an OEM I cannot
always control the features I have to work with.
I use Universal, Siemens, Mydata, MPM & DEK and 0.040" solid round
fiducials has never been an issue.
Royce
**********************************************************
Royce Taylor
Sr. SMT Process Engineer
Hadco Value Added Manufacturing
10 Manor Parkway
Salem, NH 03079
(603)896-2192 voice
(603)896-2006 fax
(800)973-4679 pager
email: [log in to unmask]
______________________________ Reply Separator _________________________________
Subject: [TN] FIDUCIAL SURVEY
Author: [log in to unmask] at smtplink-hadco
Date: 7/1/99 8:20 AM
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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