There is a good reason why tin (Sn) is so commonly used in soldering. It melts at low temperatures (232°C) and offers good wetting (ability to flow on the pad) properties . In addition to its ability to dissolve well with most metals. This last property is crucial in forming a good intermetallic compound (IMC). The quality of this IMC boundary determines how durable the joint will be.
TIN ALLOY!!
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