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surface finish thickness

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LaserTazerPhaser:
How thick is this immersion gold thickness for both options?

site is allpcb.com

It is unlikely to be 1 or 2 microns thick, its likely referring to some class or standards.

ataradov:
I think they are literally referring to micro-inches. It seems like a reasonable assumption and IPC standards also use "uin" as a unit of measure for this kind of stuff.

wraper:

--- Quote from: ataradov on January 13, 2019, 03:28:13 am ---I think they are literally referring to micro-inches. It seems like a reasonable assumption and IPC standards also use "uin" as a unit of measure for this kind of stuff.

--- End quote ---
Unlikely, 1 microinch would mean that gold is so thin there is almost none of it. You shouldn't see even a tad of golden color.

--- Quote ---It seems like a reasonable assumption and IPC standards also use "uin" as a unit of measure for this kind of stuff.
--- End quote ---
Copper thickness is often measured in um.

wraper:
Hmm http://www.unitechindustriesinc.com/services/enig-4552.htm
Seems 1um would be too thick for ENIG. But 1 uin too thin.

ataradov:

--- Quote ---ENIG General Applications The minimum immersion gold thickness shall be 0.05 µm [2.0 µin] at -4 sigma (standard deviation)
--- End quote ---

So the minimum recommended by the standard is 2.0 µin. It seems reasonable that prototyping service will do bare minimum or less. I'm sure AllPcb will do whatever is requested for real orders.

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