Hi Leo,
the connectors are about 2.6"x0.6", but the PCB is the regular 1/16" thick.
Would you be able to point me towards any study? I need Pb bullets (for high impact, as opposed to the lead-free bullets), since it might mean revising the whole project.
Thanks,
Ioan
> -----Original Message-----
> From: Leo Higgins [SMTP:[log in to unmask]]
> Sent: Friday, March 24, 2006 11:17 AM
> To: 'TechNet E-Mail Forum'; Tempea, Ioan
> Subject: RE: [TN] Superposed BGAs
>
> In several studies I have seen this opposing BGA configuration resulted in
> fewer temp cycles to failure than when TC testing was run with only one side
> BGA attached. Qualitatively, this effect is likely to be more severe for
> "larger" BGAs on "thinner" boards.
>
>
> Best regards,
> Leo
>
> Leo M. Higgins III, Ph.D.
> Vice President, Technical Support Operations
> ASAT, Inc.
> 3755 Capital of Texas Highway, Suite 100
> Austin, Texas 78704
>
> office phone 512-383-4593
> mobile 512-423-2002
> [log in to unmask]
> www.asat.com
>
>
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>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of Tempea, Ioan
> Sent: Friday, March 24, 2006 8:30 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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