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Fri, 4 Feb 2000 10:16:58 -0800 |
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Bob,
Your answer says "square pad". Do you mean square pad or paste stencil??
The question indicated square paste.
I guess either way might work on xray; sq pad/round paste or sq.
paste/round pad.
I haven't seen the square pad or paste on an xray, but it is an interesting
method.
Please clarify.
Tks........DT
At 11:57 AM 2/2/00 -0800, you wrote:
>The square pads will give you better release of the paste, also the square
>pads will help you see if the bga has reflowed properly when you x-ray them.
>
>-----Original Message-----
>From: Larry Jindra [mailto:[log in to unmask]]
>Sent: February 2, 2000 10:34 AM
>To: [log in to unmask]
>Subject: [TN] MiniBGA pad conflicts
>
>
>I'm a little confused. J-STD-013 recommends 22 mil pads for 1.00mm pitch
>BGAs, but the guideline for IPC7527 suggests 15 mil round pads with a square
>paste opening. Is anyone out there having good luck with one or the other?
>Why the large disparity?
>
>Thanks-
>
> > Larry Jindra
> > TRW/Avionics Systems Division
> > mailto:[log in to unmask] ph (858) 592-3424 fax (858) 592-3606
> >
>
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