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