Copyright ©2012–2017,Chengdu Ebyte Electronic Technology Co., Ltd. 125. Production Guidance5.1. Reflow Soldering TemperatureProfile Feature Curve feature Sn-Pb Assembly Pb-Free AssemblySolder Paste Solder paste Sn63/Pb37 Sn96.5/Ag3/Cu0.5Preheat Temperature min (Tsmin) Minimum preheating temperature 100℃ 150℃Preheat temperature max (Tsmax) Maximum preheating temperature 150℃ 200℃Preheat Time (Tsmin to Tsmax)(ts) Preheating time 60-120 sec 60-120 secAverage ramp-up rate(Tsmax to Tp) Average rising rate 3℃/second max 3℃/second maxLiquidous Temperature (TL) Liquid phase temperature 183℃ 217℃Time(tL)Maintained Above(TL) Time above liquidus 60-90 sec 30-90 secPeak temperature(Tp) Peak temperature 220-235℃ 230-250℃Aveage ramp-down rate(Tp to Tsmax) Average descent rate 6℃/second max 6℃/second maxTime 25℃ to peak temperature Time of 25 ° C to peak temperature 6 minutes max 8 minutes max5.2. Reflow Soldering Curve