RE>>ASSY: TBGA's on "big boards" 4/18/97
With respect to the repair question:
We haven't had any experience repairing TBGAs but will soon be into this, as
we're building a PCI slot card with 2 CBGAs, 3 PBGAs, and 1 TBGA on it. Your
question implies that such a repair process would differ from that for PBGAs
and CBGAs (which we do now). Why should there be a significant difference?
(Maybe I'm reading something into it....)
With respect to the prebaking:
The TBGAs that we're using are supposedly moisture-sensitive and require the
same storage and prebaking precautions as our PBGAs. No word on the JEDEC
classification on them. I don't know if these are representative of all
other TBGAs.
We've had a lot of trouble getting information from the package suppliers
about TBGAs. In fact, we've been told up front that the packages will be
PBGAs, but the TBGAs wind up being delivered to us. We ask for info
regarding some basic things like moisture sensitivity, solder ball
composition, basic assembly characteristics, reliability, and ruggedization
needs, but wind up getting almost nothing in return.
Regards,
Greg Bartlett
Mercury Computer Systems
Chelmsford, MA
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--------------------------------------
Date: 4/18/97 11:05 AM
To: Greg Bartlett
From: Tom Cooper
Dan,
This is not an answer to your repair question, but an inquiry of my
own. We are about to assemble some boards using TBGA's and was
wondering if these packages require pre-baking as do PQFP's to remove
moisture. In reading about TBGA technology, I find no mention of
pre-baking or moisture sensitivity ratings. Please advise.
Thank you in advance,
[log in to unmask]
______________________________ Reply Separator
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Subject: TBGA's on "big boards"
Author: [log in to unmask] at INTERNET
Date: 4/17/97 11:21 AM
we are currently building some 18" by 20" product
with up to 4 500+ I/O TBGA's......The production
process is ok....but we have some difficulty
during repair....Preheat profile control is a
critical parameter...does anyone have experience
with TBGA repair on big boards? What repair
platform should I investigate?
thanks
dan
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