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July 2000

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Subject:
From:
Harold Papazian <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 11 Jul 2000 14:13:11 -0500
Content-Type:
text/plain
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text/plain (67 lines)
I would question the quality of the boards you are receiving from the FAB
house. A 0.04" feature should never be a problem from an adhesion
perspective. Either the FAB is using marginal raw material, or they are over
heating the boards during the HASL process. In any case, I would question
your supplier's process controls and look deeper into their procedures.
 
Harold Papazian
Manufacturing Engineering Manager
Littelfuse
Des Plaines, IL
(847) 391-0788
[log in to unmask] <mailto:[log in to unmask]> 


        -----Original Message-----
        From:   Lefebvre, Scott [SMTP:[log in to unmask]]
        Sent:   Tuesday, July 11, 2000 1:40 PM
        To:     [log in to unmask]
        Subject:        [TN] 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
        [log in to unmask] <mailto:[log in to unmask]> 

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