Hi I'm begin to use the BGA package soon..anyone can tell me the criteria look on these BGA. What was i understand :- 1. misalignment? what is the % like? 2. Void ? what is the % allowable? What is the phenomenom & root? 3. Ball Diameter ? assume is 32mil. what is the optimum readout? what is the root cause? if a bigger diameter obtain, it mean? and how about a smaller diameter? 4. Z-height? assume is 24 mils in raw. What is the root & countermeasure? The question sound stupid but I'm believe there must be some expertise inside this world. thankx in advance Alvin ################################################################ 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 ################################################################