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March 2004

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Subject:
From:
"Scott B. Westheimer" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 9 Mar 2004 14:53:38 -0500
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My two cents would be, if this is what you are try to achieve than you might
want to consider another surface finish. Depending on the size of the pads,
copper area near or around the pads, if there are fine pitch on one side
and/or the other side,  the thickness variation might not meet your
requirements. It also depends on whether the fabricator uses horizontal or
vertical HASL machines. Horizontal will give you the best thickness
distribution but not everyone has one.

Scott B. Westheimer
----- Original Message -----
From: "Tempea, Ioan" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, March 09, 2004 2:31 PM
Subject: [TN] Finish thickness for HASL


> Dear Techons,
>
> I know that this issue has been discussed several times, but I would like
to
> check again for updates and new issues.
>
> What is a good specification for the thickness of the HASL finish, that
> would not make it impossible for the PCB fabs and it would avoid me
> receiving boards with 2-3 mils thick bumps on the fine pitch?
>
> Thanks,
> Ioan
>
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