Ingemar.
I am currently in the process of reprofiling a PCB that has a XILINX 1152
device on it, (the reason for reprofiling is we are seeing a lot of random
open circuits). Are you saying that the XILINX devices are known to give
process problems?
Thanks
Mark Austin
(Process Engineer)
ACW Technology Ltd
UK
[log in to unmask]
===== Original Message from [log in to unmask] (TechNet E-Mail Forum.) at
4/06/04 07:54
>Hi Steve,
>
>we use up to 2,500 and will see even larger soon. We had some to learn,
>that's for sure. Lucent, Mota, Xilinx, Honeywell etc were helping us with
>BGA cracks, IMC, coplanarity problem, solder criteria, pad cleanliness,
>ENIG quality, black pads and a lot more. Worst problem was one single or so
>intermittent contact on some of the many hundred balls. I would start with
>checking the coplanarity with both parts, board and BGA. After that I would
>check wetting characteristics on all pads of a whole board, to see if there
>is a spread. And visit the board maker too see what chemistry control they
>have in the daily work (6 Sigma, hate the word). Others in this forum know
>better than I, and will certainly drown you with good advice...which you
>need.
>
>If you get into IMC, black pad or other trouble, I can send you some stuff,
>or contact Jack Crawford, Georg Wenger, Kathy Kuhlow..there are some more
>near you, they have my final reporting about lots of Xilinx trouble a
>couple of years ago. They helped us, so I feel we may give something back
>to others.
>
>Hopefully, you may escape from all kind of disaster, you are a lucky guy as
>always!
>
>Cheers, bon appetite!
>
>Ingemar Hernefjord
>Ericsson Microwave Systems
>
>PS. 'Xilinx' problems can be misleading, we have absolutely zero problems
>today.
>
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>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]]On Behalf Of Steve Gregory
>Sent: den 3 juni 2004 20:09
>To: [log in to unmask]
>Subject: [TN] Xilinx Virtex-II BGA's...
>
>
>Afternoon All!
>
>We've quoted some work here to build some boards with a 3-per assembly,
>Xilinx Virtex-II, 1152-ball BGA on them.
>
>Have any of you ever placed these BGA's before? Is there anything special
>about them to look out for when assembling them?
>
>This will be my first time messing around with a BGA with that kind of ball
>count,
>and at over $6,000 each, I sure don't want to screw things up...
>
>TIA!!
>
>-Steve Gregory-
>
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