Hi Nancy - Electromigration is fairly well documented in IPC-TR-476 and IPC-TR-476A. The basic causes consist of the combination of differing circuit potential, moisture and a contaminant. I've watched dendrites form between tin/lead coated traces .050" apart at differing potentials as low as 5mv. Check TechNet archives over the past six months for quite a number of dissertations on the subject or Email me direct for further info. Regards - Kelly -----Original Message----- From: Nancy Trumbull <[log in to unmask]> To: [log in to unmask] <[log in to unmask]> Date: Friday, October 01, 1999 9:11 AM Subject: [TN] Electrical Migration Hi Every One. I need information on Migration Question 1. What will cause Electrical Migration Reason : We are seeing Dendritic Migration between components As of now we are applying conformal coating trying to stop the migration. Question: 1. Is there a rework to prevent this condition. 2. Any study or data out there on reliability as far as using this method to stop the migration. Any information at all will be greatly appreciated. If more information is needed please ask. This is all I know as of now I will do my best to get what ever is needed. ############################################################## 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 Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ############################################################## ############################################################## 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 Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ##############################################################