I would like to know the purpose of a diode connected to the optoisolator and gate resistor of this Chinese MOSFET module.
Is it for reverse polarity protection?
What kind of diode could it be?
I've rarely seen a diode in an SMD glass package.
Schematic:(image from: protosupplies.com - LR7843 MOSFET CONTROL MODULE):
Module photo (image from: protosupplies.com - LR7843 MOSFET CONTROL MODULE):
