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The diode between drain and source in MOSFETs, formed by the PN junction between source and drain. This intrinsic diode is the reason MOSFETs can block current in only one direction.

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How should I understand the intrinsic body diode inside a MOSFET?

The intrinsic body diode is the p-n junction between the body and the drain. In a discrete (standalone) MOSFET, the source and body are usually tied together for convenience to make a three-pin packag …
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