In a common emitter $\text{BJT}$ amplifier, the maximum usable supply voltage is limited by
- Avalanche breakdown of Base-Emitter junction
- Collector-Base breakdown voltage with emitter open $\left(\mathrm{BV}_{\mathrm{CBO}}\right)$
- Collector-Emitter breakdown voltage with base open $\left(\mathrm{BV}_{\mathrm{CBO}}\right)$
- Zener breakdown voltage of the Emitter-Base junction