I need some very basic info on things that everyone here seems to know about. I'm feeling a little insecure (OK fine, I feel stupid asking but I don't know and want too) What are Ball Grid Arrays, do they replace IC's? Is it more expensive that other compatable parts.....will it drive up price if I use them. Are they only used for certain app.'s I know it's alot of questions, also what actually is a blind or buried via. Is a buried via for internal layers only? ################################################################ 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 web site (http://jefry.ipc.org/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ################################################################