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Date: | Thu, 13 Aug 2009 10:00:21 -0500 |
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IBM CCGA great technology
CCGA (an old IBM Guide but very interesting)
https://www-01.ibm.com/chips/techlib/techlib.nsf/techdocs/630AFA7BD7DE3FED87256C0100558D50/$file/ccga.pdf
The largest CCGA size I worked on, produced by IBM Microelectronic, was
52.5mm X 52.5 mm with 2577 Columns, 1.00 mm column pitch. Four of them on a
Boar, plus other smaller CBGA always IBM made plus other SMDs.
PCB surface finiscing OSP
IBM Column 90/10 attachment/bonding to Ceramic Body:
- Wire type bonded by 63/37(earliest gen)
- Cast type (expensive solution)
- CLASP bonded by (63/37 doped alloy) last gen, cheaper then Cast type
According to me CCGA is still considered a strategic package for IBM, even
largest then 52.5 x 52.5 mm
They are ready also with CuCGA (Copper Column Grid Array)
http://www.me.binghamton.edu/O.M.R.L/ECTC.pdf
Rework and Replace Large CCGA, requires attention but once the process is
qualified, it is very affordable to do.
Also CCGA re-Colum process is not so difficult once you qualified it.
Regards
G. Sala
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