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February 2011

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Subject:
From:
"Forrester, Michael (H USA)" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Forrester, Michael (H USA)
Date:
Tue, 1 Feb 2011 12:08:07 -0500
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I have three questions I hope someone can help me with:
 
    1) We have a vendor that uses "city water" directly into their SMT
PCA washer.  I believe DI water is industry standard.
    Does anyone know if it is documented anywhere?  Spec?
 
    2) We had an issue where there was Chlorine contamination and gold
dendrites found inside some standard gull-wing 6 pin SMT ICs.
        This issue seems to be batch related.  The chip manufacturer
claims that chlorine is never used in their process.  Should the SMT 
        process expect to handle the possibility that the wash solution
may get into a part? The PCA vendor uses unfiltered "city water", 
        with no cleaner, in the wash process and does a ROSE test on one
board of each lot.  Since the ROSE test passes, the PCA vendor 
        is blaming the part manufacturer for having "leaky" parts, since
the thinking is the wash is getting into the part and trapped.  
    3) One issue I have is the water pressure in the wash is 80-100 psi.
I think this is too strong, and should be half of that?  You want to 
        flood the board with water, not hit the board and bounce off?
 
    Thank you in advance.
 
Best Regards,
 
Michael Forrester
Sr. Product Engineer
 

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