What are the operating points for a bipolar transistor used as a switch?
Saturation and cutoff✓Bonne réponse
The active region (between cutoff and saturation)
Peak and valley current points
Enhancement and depletion modes
Explication
A switch is either fully on or fully off, which for a bipolar transistor means saturation and cutoff. The active region between them is where linear amplification happens, and it is also where the device dissipates the most heat, so a switch is designed to pass through it quickly.