Integrated Circuit Front to Back

The section above is from a forum. Could you tell me what does “Front
to Back” mean here? I think it maybe means “completely” from front to back but I am not sure.

That is technical language. You would be better asking on that forum.

Thanks! Could you tell me your thoughts about this as a native speaker?

Sorry, I don’t know anything about icfb. I don’t even know what it is referring to.