After some browsing I found transistor circuit very similar to my needs: Understanding an 'ideal' diode made from a p-channel MOSFET and PNP transistors Unfortunately its application is limited by the Emitter-Base breakdown voltage of used PNP transistors. Does anybody know similar circuits for 24V? Thank you in advance.

  • \$\begingroup\$ Does it have to be with P-MOS? Is N-MOS acceptable? \$\endgroup\$ – Rohat Kılıç Dec 29 '17 at 7:20


simulate this circuit – Schematic created using CircuitLab

Can you work with a discrete version with a higher PIV rating for D2?

  • \$\begingroup\$ Yes, D2 is not a problem. Will try. Thank you for help :-) \$\endgroup\$ – L. Bo Mar 5 '17 at 6:54
  • \$\begingroup\$ D2 and Q1 must be carefully matched I think, or am I missing something? \$\endgroup\$ – next-hack Sep 20 '17 at 6:00
  • 2
    \$\begingroup\$ good point... D2 must be a small,signal diode such that ; Vf of D2 >= Vbe of Q1@1mA at all times when input is 24V and output is also 24V , the desired operating point for switching \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 Sep 20 '17 at 7:25

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