>From jamesp Mon Nov 4 13:12:03 1996 To: [log in to unmask], [log in to unmask] Subject: re: Surface Mount Land Patterns Content-Length: 799 Gary: We comply with the principles of "782A" as well. We have higher yields using the footprints made from this spec. I'm not sure however what you have found with the chipcaps? My understanding is that the land pattern ranges for "Z" "G" and "X" dimensions and the 'Jtmin/max' and 'Jhmin/max' dims were compiled empirically from the industry? If I apply our company's assy/fab tolerances, and establish the manufacturer's tol, I thought that as long as unilateral tolerances were handled such that the principles for rss'ing toward the MMC/LMC profile limits allowed any pattern to be created. Are the fillet tables possibly incorrect? The manufacturer dimensions seem to be consistant with mil/ sheets, etc. James Patten TRW Space Electronics **************************************************************************** * 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. * ****************************************************************************