Lon; Normal use Solder is alloy formed by Sn and Pb that has different melting points. When you mix the material you will have temperatures range that they are solid, temperatures range that they are something between solid and liquids and temperatures that they are liquids. There is a mix value that the alloy goes from solid to liquids without passing trough the intermediate state, this value is Sn 63% and Pb 37% and this is the lower temperature at the diagram Sn/Pb% x temperature and the value is 183 degree C. So the eutectic solder temperature for SnPb is 183 degree C, for SnPbAG is 179 degree C, and many others for different alloys One of the challenges for a lead free solder alloy is the eutectic solder temperature not be so different from SnPB because too high will impact the components and too low will impact reliability at hard environments applications I hope this help Jorge Dourado de Santana Maintenance / Process Engr Microtec - Brazil > -----Original Message----- > From: Lon Weffers [SMTP:[log in to unmask]] > Sent: 25 de Abril de 2000 16:24 > To: [log in to unmask] > Subject: [TN] eutectic > > Dear friends, > > It might seem a stupid question, but what does Eutectic mean when they > talk > about eutectic solder temperature? > > Thanks in advance > Lon weffers > > ############################################################## > 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 ##############################################################