I have seen this before. Of course you are probably forced to deal with a
purchasing agent who does not make design decisions.
They must like the crinkle finish and flow under the mask issues there...
how funny.

SMOBC is the standard. It works. The other method of soldermask over solder
is just not wise. However, the customer is always right.... even when they
are wrong.

(I can sense your frustration.... now... let go your feelings of
aggression... and your journey to the 'dark side' will be complete.... join
me, and together we will bring order to the PCB galaxy... muhaahaahhaa! )

<grin - it's Friday>
Have a great weekend Steve...

Bill Brooks
PCB Design Engineer , C.I.D., C.I.I.
Tel: (760)597-1500 Ext 3772 Fax: (760)597-1510


-----Original Message-----
From: Steve Gregory [mailto:[log in to unmask]]
Sent: Thursday, April 08, 2004 6:52 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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