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April 2004

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Subject:
From:
Mark Hargreaves <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 9 Apr 2004 07:38:23 -0400
Content-Type:
text/plain
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text/plain (80 lines)
Morning Steve,
You could try throwing the book at them.

IPC-D-275,
Par 5.5 Coatings and Markings
"Coatings & markings shall be compatible with each other".
Par 5.5.1 Solder Resist Coatings
"Solder resist adhesion to melting metal surfaces (solder coating, tin/lead
plating, etc.) cannot be assured as boards are subjected to temperatures
that cause redistribution of the melting metals. ..............When solder
resist is required over melting metals, the maximum recommended conductor
width shall be 0.050".

Regards,
Mark
PS..Par 5.5.1 contains additional info.

        -----Original Message-----
        From:   Steve Gregory [SMTP:[log in to unmask]]
        Sent:   Thursday, April 08, 2004 9:52 PM
        To:     [log in to unmask]
        Subject:        [TN] Solder Mask over Tin/Lead...

        Had a really frustrating conference call today. Our customer is
standing firm
        that they will not change their drawings on their fabs that specify
that
        everything needs to be coated with tin/lead before solder mask.

        Their arguement is that they've never had any problems before, so
why should
        they change anything...and I percieved that they blamed our assembly
processes
        for the mask adhesion issues that we were seeing.

        What do you do in a situation like this? I'm trying to gather as
much
        information as I can that shows that anything other than SMOBC is
risky, but during
        the conference call, anything that I tried to say was
dismissed...because they
        say that they've been doing this for years, and this is the first
time that
        they have heard from any of their subcontractors that there is a
problem.

        I suppose that there won't be any good answers for this, we'll have
to deal
        with this the best that we can. Sure makes life interesting...the
customer is
        always right, and we're all about customer satisfaction.

        -Steve Gregory-

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