Hi BLM, you do not mention if the bridges you see are following reflow, or, most likely wave soldering. For wave, we found 10 mils to be a good distance to avoid shorts, so maybe you should play a little with the soldering parameters. Another solution, better, is to plug the vias from the side giving the trouble. I know this is not the answer you wanted, but I know nothing of specs on this matter and I felt the need to comment, since the ol' boys are very quiet lately. Ioan > -----Original Message----- > From: Brad L. Matthies [SMTP:[log in to unmask]] > Sent: Friday, March 31, 2000 1:27 PM > To: [log in to unmask] > Subject: [TN] Via Hole Placement. > > TN, > > We are experiencing some manufacturing problems (solder bridging) and > have linked them to via hole placement. The particular assembly we are > manufacturing has multiple via holes that are within approximately 15 > Mils of SMT lands. Does anyone have a resource that spells out safe > distances of via holes to SMT lands that they can pass along? We are > getting ready to approach the design group for this product and are > looking for a qualified resource of information that we can use as well > as the design group. > > Thanks, > BLM > > ############################################################## > TechNet Mail List 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 TECHNET <your full name> > To unsubscribe: SIGNOFF TECHNET > ############################################################## > Please visit IPC web site (http://www.ipc.org/html/forum.htm) for > additional > information. > If you need assistance - contact Keach Sasamori at [log in to unmask] or > 847-509-9700 ext.5315 > ############################################################## ############################################################## TechNet Mail List 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 TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ##############################################################