Good Morning! Alloy Sn63 melts at 183C - that is the only 'given' in an equation to make solder joints with that alloy! Your peak temperature that you shoot for in a reflow operation is going to be a combination of the printed wiring board thermal demands, the robustness of the types of components you are using and the thermal characteristics of the flux in your solder paste. I don't think that there is a "recommended" peak temperature because of the wide range of variable inputs. An enormous amount of time and equipment is devoted to giving a process engineer tools to allow him/her to optimize an assembly reflow profile. I usually shoot for 30 seconds at 194C but that is just my preference and if I had to back it up with data I'd lose. Good Luck. Dave Hillman Rockwell Collins [log in to unmask] ______________________________ Reply Separator _________________________________ Subject: Peak Soldering Temp. Author: [log in to unmask] at ccmgw1 Date: 12/12/96 2:47 PM Hi, I am fairly new to the PCB industry. But when I read the book about the reflow soldering process, it takes normally 213C as the peak soldering temp when the melting point of the solder may be, say 183C. My understanding is that, it takes sometime to melt and acheive a good solder joint. But how to determine 213C? Or put it this way, what is the minimum peak temp. one should maintain? Have you come across any literatures that talk about it ? Any input is appreciated. Thanks. Y.F. Wong *************************************************************************** * 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. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [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. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************