Hi Steve, Graham, TechNetters, We are including some Ceramic Column Grid Arrays (CCGAs) on some Proving Boards we have designed to look at BGA technology and advanced substrates (lower TCEs etc); these to be evaluated along with mounting methods/pad designs within our own military environments. I can see the advantages of TCE (sorry, CTE your side of the pond!) when using un-matched substrates, but what I am a little unconvinced on, is what the market desire for such a packaging option is, and following on from that, what the market supply of them will end up with in terms of likely availability - will they ever be offered by anyone? I understand IBM is a significant manufacturer/user, but what of others? Are CGAs a red herring? Thanks for any comments, shoot me down if I'm wrong! Clive ffitch MBUK, Stevenage, England [log in to unmask] ______________________________ Reply Separator _________________________________ Subject: Re: [TN] Column Grid Arrays Author: "\"TechNet E-Mail Forum.\" <[log in to unmask]>, \"Collins, Graham\"" <[log in to unmask]> at INTERNET Date: 30-07-98 14:34 Steve A CGA is like a BGA but with a column of hi-temp solder instead of the ball. My understanding of it is that it gives the package more flexibility so that you have less failures (due to CTE differences) compared to a BGA. For high I/O count devices on (for example) a ceramic body it makes sense to use a CGA, perhaps that's why your customer is considering it. I'm not sure how it would be viewed as more manufacturable. There are several papers on CGA in the proceedings from SMI '97. regards, Graham Collins Process Engineer Litton Systems Canada (902) 873-2000 extension 215 -----Original Message----- From: [log in to unmask] [mailto:[log in to unmask]] Sent: Thursday, July 30, 1998 10:45 AM To: [log in to unmask] Subject: [TN] Column Grid Arrays All, Maybe I just too new to this SMT thing, but can someone clue me in on what exactly a column grid array device is? I have been presented with a proposed build to print project that according to our customer may use column grid array devices instead of BGA's to "enhance manufacturability". Thanks in advance of your support!! Steve McBride Frontier Electronic Systems Corp. [log in to unmask] ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################ ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################ ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################