Electronic Circuits/The BJT Modes
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Depending on the different bias conditions on the emitter-base Junction(EBJ) and the collector-base junction(CBJ), the following modes of operation of BJT are obtained:
| Mode | EBJ junction | CBJ junction |
| Cut-off | Reversed | Reversed |
| Active | Forward | Reversed |
| Reverse-Active | Reversed | Forward |
| Saturatied | Forward | Forward |
It is important to note that these rules apply for the PNP transistor as well. We don't care how the diode gets forward biased, merely that it is forward biased.