I have looked out one of my old PCBs featuring CGA the design rules were as follows: Column was 0.018" - 0.020" Pad size 0.026" Solder mask 0.030" Telecommunications application Convection reflow soldered IBM and other provide design rules for their packages. My inspection criteria for these is covered on the BGA Inspection CD-ROM available from the IPC bookshop. Its also covered on inspection posters covering optical and x-ray. The CGA I believe is to be covered in the future in 610 but nothing in the draft at the moment. Remember having fun doing the profiles on convection and rework, easy with VPS. Hope this helps Bob Willis 2 Fourth Ave, Chelmsford, Essex, CM1 4HA England Tel: (44) 1245 351502 Fax: (44) 1245 496123 Mobile: 07860 775858 www.ASKbobwillis.com Book your place on Bob's "Step by Step Failure Analysis Workshop" 14th May www.ASKbobwillis.com/faworkshops.pdf New "Printed Board Inspection & Quality Control" 3 July www.ASKbobwillis.com/PCBworkshop.pdf -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Hfjord Sent: 15 April 2008 19:22 To: [log in to unmask] Subject: [TN] SV: [TN] Column Grid Arrays Don't know if Happy Holden is still at Big Blue/Fishkill. He ought to know a lot, as being one of the column grid inventors. Inge -----Ursprungligt meddelande----- Från: TechNet [mailto:[log in to unmask]] För Tan Geok Ang Skickat: den 15 april 2008 13:23 Till: [log in to unmask] Ämne: Re: [TN] Column Grid Arrays I did it once, important thing is that the solder paste volume must have at least 30% of the column height. If rework is needed, solder paste volume has to be about that of SMT solder paste printing process. ________________________________ From: TechNet on behalf of Edwin Louis Sent: Fri 4/11/2008 12:24 AM To: [log in to unmask] Subject: [TN] Column Grid Arrays Does anyone know what specification calls out the board pad diameter/solder column diameter ratio for column grid arrays and what the values are? --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------