Amp. per phase!?

[BrianG]

And if that is true, then you can consider that 104A per phase value more like ~50A per phase because FET junction temps are usually quite a bit higher than FET case temps, and FET case temps are higher than heatsink temps. Unless of course, you run your ESC submerged in liquid nitrogen.

And Neil, you are right, it's called temperature derating.