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Why do MOSFETs have a diode?

1 Answer. Yes, power MOSFETs have a parasitic diode called body diode. Thanks to this diode, only a MOSFET can function as a one-way switch. Only a MOSFET can disconnect the opposite direction, because the diode works independently of the door.One answer. The Body Diode is a component of power MOSFETs. A single transistor can only be used as a switch. A single MOSFET is not able to switch-off the opposite direction.

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