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March 2006

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Subject:
From:
John Burke <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, John Burke <[log in to unmask]>
Date:
Fri, 24 Mar 2006 08:55:43 -0800
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text/plain
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text/plain (64 lines)
You end up with twice the power on the same footprint which can be an
issue in some cases, also since they are occupying the same X Y space it
is almost (but not quite!!) impossible to do re-work on one device
without driving the other into secondary reflow.

John

John Burke
Senior Manager - Operations , Optichron
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W: 510 249 5233
M: 408 515 4992
http://www.optichron.com
Profile: https://www.linkedin.com/e/fps/2665502/

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Tempea, Ioan
Sent: Friday, March 24, 2006 6:30 AM
To: [log in to unmask]
Subject: [TN] Superposed BGAs

Hi Technos,

I am reviewing have a PCB design draft which has 2 MEG-Array BGA
connectors from FCI. The problem is that one is on the topside and the
second one on the bottom side, their locations perfectly overlapping.
Otherwise said they one on top of the other.

I remember having seen a thread on Technet a few years ago stating that
this construction is not reliable. Unfortunately I cannot find the
e-mails in the archive.

What would be your take on this?

Thank you,
Ioan

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