How many thicknesses of the Intermetallic Cimpounds (IMC) is good?

Well, there may be a misunderstanding that people think the IMC layer grows the thicker the more strong soldering strength. Actually, the IMC layer can be grown and distributed evenly at the interface between Cu-based, Ni-based and Sn-solder will be enough.

Once the IMC layer grows too thick and over 5um then it will become brittle and soldering strength will be reduced.

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