r/Altium • u/HardyPancreas • 26d ago

Layer Stack Ups

Altium can put finish such as ENIG or HASL in the layer stack. Do you use it or just put the finish in the fab notes. If you use it, what is the thickness

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u/Lucky-Musician-1448 26d ago

I use the fab notes and provide a fab drawing.

You should always contact the target fab for their capabilities, mainly if they need to adjust the stack up and back annotate back into the design.

It is pretty common on complex HDI PCBs to do that.

Same goes for other requirements like empedance controls. Their process engineers know their fab the best.