Wave Solder
First Choice (especially for High-Tech)
• SAC-305: Sn96.5Ag3Cu0.5                    217>220°C         (First filling of the solder bath)
• Sn-Ag                                                          221 °C                  (Refills)

Second Choice
• Sn-Cu (Ni)                                                 227 °C 
r Less Wettability (Higher Melting Point!)
r Conflicts with SAC-alloy on Reflow-Side 
a  Lower Cost Material

 

Reflow Soldering
SAC Alloys, Melting Points / Melting Range

• 405: Sn95.5Ag4Cu0.5 (or 3.8/0.7)                                  217°C 
   a Marginally better Solder Quality than 305

• 305: Sn96.5Ag3Cu0.5                                                      217>220°C
   a Slightly less expensive than 405.

• S9M: Sn96Ag3.75Cu0.25                                                217°C+221°C
   r Anti Tomb-Stoning mix of powders. (Usually only necessary for vapor-phase processes)