One more remark. I suspect that your connectors will not be cyclically
dissipating power as is the case with a PBGA component, so info on PBGAs may
not be relevant to your situation
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
The information contained in this electronic message is CUSTOMER/SUPPLIER
PRIVILEGED AND CONFIDENTIAL INFORMATION intended only for the use of the
individual or entity named above. If the reader of this message is not the
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Tempea, Ioan
Sent: Friday, March 24, 2006 10:23 AM
To: [log in to unmask]
Subject: Re: [TN] Superposed BGAs
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
>
>
> The information contained in this electronic message is CUSTOMER/SUPPLIER
> PRIVILEGED AND CONFIDENTIAL INFORMATION intended only for the use of the
> individual or entity named above. If the reader of this message is not the
> intended recipient, you are hereby notified that any dissemination,
> distribution and copying of this communication is strictly prohibited. If
> you have received this communication in error, please immediately notify
the
> sender by electronic mail. Thank you.
>
>
>
> -----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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