Stella, PCB pad sizes should match the CSP pad size. If you can't find that out from the component manufacture, a good rule of thumb is to use pads that are 80% of the size of the ball. Thanks Ryan Grant Advanced Technology Engineer MCMS (208) 898-1145 [log in to unmask] > -----Original Message----- > From: Stella Neyman [SMTP:[log in to unmask]] > Sent: Wednesday, June 28, 2000 12:08 PM > To: [log in to unmask] > Subject: [TN] BGA pads size > > Technetts, > Please help. > I have to do the PCB layout for 8mm x 8 mm BGA. 108 Balls size of 0.3 mm, > spacing is 0.5 mm. > Could somebody advise what would be the pads size? What is would be vias > diameter? > Please advise. > Thank you, > Stella > > ############################################################## > TechNet Mail List 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 web site (http://www.ipc.org/html/forum.htm) for > additional > information. > If you need assistance - contact Keach Sasamori at [log in to unmask] or > 847-509-9700 ext.5315 > ############################################################## ############################################################## TechNet Mail List 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 web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ##############################################################