You are correct, Scott. 
If a .040 fiducial comes off, what happens to a .020 SM pad? 
Are there no other features coming off your boards? (that would be
surprising)
If multilayer, are they using a foil construction (meaning they are pressing
foil to the outside of the package)? (tells if it's the board fab or the
laminate supplier)
Is it FR-4, or some other material? (Other materials may have lower hot peel
strength)

-----Original Message-----
From: Lefebvre, Scott [mailto:[log in to unmask]]
Sent: Tuesday, July 11, 2000 11:40 AM
Subject: Missing Fiducials


I have a problem with fiducials missing on our FAB's when we receive  them
from the vendor.  It is random and not specific to any one  assembly.
The boards are being HASL and this is where they are coming off during
fabrication.  The fiducial size is 0.040" circle ½ oz. Copper.  We  have
other board shops that we use and I haven't had this problem.
Getting to the Question:
The board shop in question asked if we to increase fiducial size or
increase copper around fiducial.  I feel that this isn't the source of  the
problem I don't feel that we are asking anything out of the  ordinary using
0.040" fiducial.  I would appreciate any suggestions in   this matter.
Thank you,

ADC
Scott Lefebvre
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