Bootstrap diode circuits are disclosed. Example bootstrap diode circuits disclosed herein include a first diode having a first diode input coupled to a voltage supply and a first diode output. Disclosed bootstrap diode circuits additionally include a second diode having a second diode input coupled to the first diode output and a second diode output and a plurality of zener diodes coupled in series. The plurality of series-coupled zener diodes are further coupled in parallel with the second diode.