What is the best soldering temperature for lead-free soldering?

The melting point of lead-free solder is approximately 217 °C. But you cannot solder at this temperature! The soldering temperature should be approximately 100 ° C above the melting point. That means a total temperature of 317 °C. You also have to take into account the tolerance of your soldering iron / soldering station. So 330 °C would be a good (safe) choice. Do you also have a lot of thermal mass in your printed circuit board and you do not have underheating available? Then you can turn the temperature up to a maximum of 380 °C ……… but be careful, at higher temperatures the PCB and the components will probably burn! The IPC-7711/7721 guideline specifies the best temperature for each procedure.