We have a design that utilizes a 620 ball 1mm pitch bga(6 balls deep / 26 balls wide). In the past our dispersion and routing via has been a 25 mil pad, 10 mil drill, 35 mil clearance. Our designs are dense and typically utilize 5mil traces/spaces. We are still using the 25 mil via as the general routing via but looking for recommendations/examples of what folks are using for dispersion on 1mm bga s. Thanks, Jim --------------------- Jim Dobbins Tel: (408) 530-4700 Front Desk Tel: (408) 530-4745 Direct Line Email: [log in to unmask] ################################################################ DesignerCouncil 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 DesignerCouncil <your full name> To unsubscribe: SIGNOFF DesignerCouncil ################################################################ 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 ################################################################