Video to introduct what is IMC (Intermetallic Compounds)? how to judge IMC healthy?

There is a misunderstanding that people think the IMC layer grows the thicker the stronger soldering strength. The IMC layer can be grown and distributed evenly at the interface location will be good enough. Once the IMC layer grows too thick and over 5um then it will become brittle and soldering strength will be reduced.

How to judge the IMC healthy? How much thickness of IMC is good? Where the IMC layer grows in the soldering? Here has a video to show you the IMC location in the BGA soldering.

https://youtu.be/ifVEW5gsNAs

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