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Reply To: | TechNet E-Mail Forum. |
Date: | Thu, 28 Mar 2002 11:42:40 EST |
Content-Type: | multipart/alternative |
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Hi Adrian!
Is this part a Texas Instrument part that has a big metal heat slug in the
top? I've seen this happen with that part because of the weight of the heat
slug...the balls
look kinda "squished" too...
-Steve Gregory-
> Hi Technetters,
>
> Can anyone help me?
>
> We are curently running some BGA'S through reflow, and on inspecting them
> through our Ersascope BGA inspection system have measured there is a ball
> drop of around 30% from original ball size. The actual ball formation looks
> very "border line" as in, has it single or double dropped. Does anyone know
> the guidlines for such a drop? Is 30% the bottom end tolerance and if so
> should I be looking at a drop of + 30% to insure a good looking sound joint
> on the BGA.
>
> Many thanks in advance,
>
> Adrian Hanks.
>
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