I am in an advanced development group at Sandia. For the last 8 years we have used commercial PWBs and solder-assembly methods/suppliers for all of our projects. These were typically 6Ux160mm VME boards, double-sided SMT with some thru-hole connectors, 8 to 10 layers, nominal 5/5 lines/spaces, 180 Tg FR4. Components included PBGAs, 25-mil and 50-mil pitch SOICs and PQFPs, 0.5mm and 0.4mm pitch PQFPs, etc. Speeds from 10-80MHz CMOS to high-speed ECL and GAS RF stuff for RADARs and the like. Some controlled impedance required. We are brainstorming issues related to commercial suppliers for future weapons component PWBs. Can anyone help me with a comparison of commercial specs. vs "mil" specs. I don't know much about the mil-specs but I thought I heard they are being eliminated. Is there and IPC spec that can be called out that will give the weapons guys the equivalent of their old mil-P-55110 boards? My impression of most good PWB vendors today is that we can't buy a bad board no matter how hard we try. The most convincing argument would be a side-by-side comparison of the required tests for meeting the IPC commercial spec vs its military spec equivalent. Thanks in advance, Gary P. --- Gary D. Peterson _/_/_/ _/ _/ _/ SANDIA NATIONAL LABORATORIES _/_/_/ _/ _/_/ _/ _/ P.O. Box 5800, M/S 0503 _/_/ _/_/_/ _/ _/ _/ _/ Albuquerque, NM 87185-0503 _/_/_/_/_/_/ _/ _/ _/_/ _/ Phone: (505)844-6980 _/ _/_/ _/ _/_/_/ _/ _/ _/_/_/_/ FAX: (505)844-2925 _/ _/_/ _/ E-Mail: [log in to unmask] _/_/_/ *************************************************************************** * TechNet 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. * ***************************************************************************