Melting point of lead free solder wire

Melting point of lead free solder wire

What is the melting point of lead free solder wire?

Lead free solder wires are available in different compositions and each composition has a different melting point. The lead free solder wire means the solder wire is made of tin, silver and copper without lead content, it's a solder wire that complies to ROHS regulation. And we have majorly 3 types of lead free solder wire and below are the melting point of lead free solder wire:

Type One: SAC305 lead free solder wire melting point. This SAC305 solder wire is made of 3.0% silver and 0.5% copper, remaining 96.5% is tin. This is a eutectic alloy of tin-silver-copper solder alloy, and the melting point is 217℃, the liquidus and solidus temperature is same.

Type Two: SAC0307 lead free solder wire melting point. This SAC0307 solder wire is composed of 0.3% silver, 0.7% copper and remaining 99% is tin. This solder wire contains low silver, it save a lot of cost comparing to SAC305, but the 0.3% silver still improve the solder-ability and electrical conductivity. The melting point is 217 to 225℃, the solidus temperature is 217℃ and liquidus temperature is 225℃.

Type Three: SAC07 lead free solder wire melting point. The SAC07 solder wire contains no silver comparing to the other two types, it's just composed of tin at 99.3% and copper and 0.7%, it's the most economic one among the three lead free solder wire. The melting point is 227℃, its also an eutectic alloy, solidus temperature and liquidus temperature the same.

 

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