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62Sn36Pb2Ag versus Sn63Pb37
We didn’t have the same composition for you. Please just refer below data
Basic Properties
ü Cross-section view (SEM)
Sn/37Pb
Sn/37Pb/2Ag
Melting Temp. (℃)
183
179~180
Density (g/cm3)
8.40
8.44
Vicker’s Hardness
(Hv)
12
13.1
Elongation (%)
45
31
Tensile Strength
(Mpa)
40
47.6
Thermal Exp.
(x10-6/k)
21
25.7
Electrical Resistivity
(μohm·cm)
14.5
14.8
Sn37Pb
Pb-rich
AuSn4
Sn37Pb2Ag
§ Sn37Pb2Ag have higher hardness and tensile strength than Sn37Pb because of Ag3Sn
precipitates in solder bulk.
§ Therefore, Sn37Pb2Ag solder has higher mechanical strength and thermal cycle performance.
RealValueä
MK Electron Co, Ltd. 2011
Beyond the Perfection TM
u Test condition & Result
- Thermal cycling test : 155/-45℃, 15/15min
- Ball size : 640um
§ Sn37Pb2Ag showed higher shear strength and low reduction rate of strength
than Sn37Pb during thermal cycling.
§ As a result, Ag have benefit for mechanical strength and thermal cycling performance
RealValueä
MK Electron Co, Ltd. 2011
Beyond the Perfection TM