I've been looking at the reverse polarity protection with a P MOSFET as part of a new PCB I am designing. My system is 12v. Most of the videos and diagrams I have seen, namely Afrotechmods YouTube & Components 101 use a P MOSFET alongside a zener diode and resistor. I believe the Zener diode is used to protect the P MOSFET from over voltage incase of reverse polarity.
I have found two sources which say I could connect a single MOSFET without a Zener diode/ resistor provided the maximum gate-source voltage exceeds the system voltage - Stack - 'throw away the zener' & Reverse Voltage Defender.
I was planning of using one of these Mouser IRF9540SPB which has a gate source voltage of - 20 V, + 20 V.
If I use a IRF9540SPB P MOSFET in a 12v circuit do I also need to connect a resistor and Zener diode or are these superfluous?