body diode of MOSFET

one of these may help:

this seems most likley:

senmeis said:

This diode is by no means a physical one.

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It is not a separate physical diode, but it is certainly real.

senmeis said:

My question is if it’s the same body diode found on page 3 of this document:

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Well - it's not the same diode - but - somewhat similar, the body diode or intrinsic diode in a mosfet is a by product of the easiest construction ( at is the inherent parasitic BJT ) - this is also true of the op-amp ( and many other IC's ) that have a substrate of typically N material, but can be P too ), and diffuse "wells" into it to form the parts of the IC - there's no free lunch in IC wafer fabrication

[ p.s. this inherent but normally reversed biased diode in the IC often causes "latch-up" issues if somehow the voltage on the substrate goes high enough relative to other pins for conduction to happen - in the old days the substrate connection was some times brought out to connect it to a low potential to ensure this never happened ].