Hi Scott ! Aperture size : See Phillips, " IC Package Databook", Phillips Semiconductors, page 5 - 2 , it states that dimensions of the openings should be about 10 % smaller than those of the lands ( see the tolerances in paste printing process ) We are happy with this recommendation. Hope this will help. Brs, Johannes *************************************************************************** * The mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text.* *************************************************************************** * If you are having a problem with the DesignerCouncil, please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************