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Solder Formulations

Alloy
Alloy Selection
Containing Lead		 Solidus
(°C)		 Liquidus
(C°) 		Tensile Strength
(psi)
Sn43 Pb43 Bi14 144 163 6120 / 42.2
Sn62 Pb36 Ag2 179 189 6700 / 46.2
Sn63 Pb37 183 183 6700 / 46.2
Sn60 Pb40 183 191 6200 / 42.7
Sn10 Pb88 Ag2 268 290 4900 / 33.8
Sn10 Pb90 275 302 4600 / 31.7
Sn5 Pb92.5 Ag2.5 287 296 4210 / 29.0
Sn5 Pb95 308 312 4190 / 28.9
Lead-free
Alloy Selection 		Solidus
(°C)		 Liquidus
(C°) 		Tensile Strength
(psi / MPa)
Sn42 Bi57 Ag1.0 137 139 4641 / 31.9
Sn42 Bi58 138 138 8000 / 55.2
Sn96.5 Ag3.0 Cu0.5 217 219 8900 / 61.4
Sn96.3 Ag3.7 221 221 8900 / 61.4
Sn95 Ag5 221 245 10100 / 69.6
Sn100 MP 232 1800 / 12.4
Sn99.3 Cu0.7 227 227 n/a
Sn99.3 Cu0.7 232 240 5900 / 40.7
Sn99.3 Cu0.7 242 262 12000 / 82.7
Sn99.3 Cu0.7 250 257 n/a
MP: Melting Point
Alloy Powder Size
Powder Type Size (micron) Dispense Dot Dia. Aperature (mm/in) GullwingLead Pitch (mm/in) Square/Circle Aperature (mm/in)
II 45-75 0.80 / 0.030 0.65 / 0.025 0.65 / 0.025
III 25-45 0.50 / 0.020 0.50 / 0.020 0.50 / 0.020
IV 20-38 0.30 / 0.012 0.30 / 0.012 0.30 / 0.012
V 15-25 0.25 / 0.010 0.20 / 0.008 0.15 / 0.006
VI 5-15 0.10 / 0.004 0.10 / 0.004 0.05 / 0.002
Flux Features
Dispensing NC RA RMA WS
Clear Residue Yes No No No
Difficult-to-Solder Surfaces Yes No Yes Yes
Enhanced Wetting Yes Yes Yes Yes
Extended Reflow Cycle Time (> 6 minutes) Yes No Yes No
Fine Pitch Yes Yes Yes Yes
Gap Filling and/or Vertical Surfaces Yes No Yes No
General Purpose Yes Yes Yes Yes
Halide-free No No No Yes
Lead-free Shiny Fillet Yes No No No
Low Residue Yes No No No
Pin Transfer or Dipping (low viscosity) Yes No No No
Rapid Reflow Cycle Time (< 5 seconds) No No Yes No
Reduced Slump Yes No Yes Yes
Restricted Residue Yes No No No
UV Traceable No No Yes No
Printing NC RA RMA WS
24-hour Yes No Yes Yes
Clear Residue Yes No No No
Difficult-to-Solder Surfaces No Yes Yes No
Enhanced Wetting Yes No Yes Yes
Extended Reflow Cycle Time (>6 minutes) Yes No Yes Yes
Fine Pitch Yes Yes Yes Yes
General Purpose Yes Yes Yes Yes
Halide-free No No No Yes
Lead-free Shiny Fillet Yes No No No
Reduced Slump Yes No Yes Yes
Restricted Residue Yes No No No


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