Inge I would think any ceramic package device has got to be more expensive than polymer. Also it may simply be human factor. - If you got your design rules all set up and know about particular devices, and you look at these, a bit scary? As its Friday .... I read somewhere that to succeed you need a three letter acronym, IBM ICA for example, so on that basis CCGA is doomed. There is a (probably apocryphal) story about a bloke who started a company called NNC Inc. When asked what it meant he said he knew you had to have thee letters -as described above - but couldn't think of anything suitable to abbreviate, so NNC stood for No Name Company. HAGWE Mike -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Hernefjord Ingemar Sent: 14 August 2009 08:12 To: [log in to unmask] Subject: Re: [TN] HDI AND COLUMN GRID ARRAY PACKAGING There must be some reason why these excellent components have not been more universally used. Price or what? Or coplanarity issues, as someone mentioned? /Inge -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of G. Sala Sent: torsdag 13 augusti 2009 17:00 To: [log in to unmask] Subject: Re: [TN] HDI AND COLUMN GRID ARRAY PACKAGING IBM CCGA great technology CCGA (an old IBM Guide but very interesting) https://www-01.ibm.com/chips/techlib/techlib.nsf/techdocs/630AFA7BD7DE3FED87 256C0100558D50/$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. 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