egads. This should be interesting. .4mm BGA? I would go straight to my assembly house and then my fab house. Please keep us updated. -----Original Message----- From: icu-pcb-forum-bounce@xxxxxxxxxxxxx [mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx]On Behalf Of Gino Papelera Sent: Friday, October 27, 2006 8:06 AM To: icu-pcb-forum@xxxxxxxxxxxxx Subject: [PCB_FORUM] .4 mm pitch bga's Everyone, What's your recommendation for microvia sizes, line and spacing for routing .4mm bga's? I saw a technotes using .065mm line and space between 0.2mm pad/0.1 drill micro via. Anyone using these in their designs? regards, Gino