Experiment 6 - The Leakage Current (Reverse Current)

A diode in the reverse direction does not let current pass? In this experiment, you examine it.

Look at the circuit shown. You recognize the diode which is connected in the reverse direction. Behind it a Darlington pair is attached to amplify any weak current passing the diode.

Darlington pair with a diode in reverse direction. (Enlarge)

Circuit diagram Darlington pair with a diode in reverse direction.

In fact, the LED lights up weakly!

Through the diode, a current of only a very few μA flows. This current is called leakage current or reverse current.

I-V characteristics of an ideal diode with leakage current.

Reverse or Leakage Current Even as the reverse or leakage current is small, you can not always ignore it. In data sheets you will find information under the entry "Reverse Current" IR.

In next step you you look closely at the reverse area.