Electronics - Bipolar Junction Transistors (BJT) - Discussion

Saturation and cutoff region transistors act as switches in switch condition is on and off. So it is used for digital circuits.

One of the most common uses for transistors in an electronic circuit is as simple switches. In short, a transistor conducts current across the collector-emitter path only when a voltage is applied to the base. When no base voltage is present, the switch is off. When the base voltage is present, the switch is on.

The areas of operation for a transistor switch are known as the Saturation Region and the Cut-off Region. And use the transistor as a switch by driving it back and forth between its "fully-OFF" (cut-off) and "fully-ON" (saturation) regions.

The transistor is always work in digital as a switch on/off or close/open and 0/1 is similar as 0V(low) and 5V(high)so, saturation and cutoff regions is the answer for digital function.

Although transistor is work in the active region because it has a biased voltage 5V/15V so ip is forward biased and op is reversed biased when ip is apply >0.8V op is 5V(high) and ip is <0.7V op is 0.4V(low).

Yes, I agree with this answer because the saturation and cut off mode are the most available for this question.

Generally we are using min and max term in digitial circuit like that the term will be 0 to 1 or others like that one is min and second one is max then the transister will be linear region and it also oprate in satutration region which help us the switch will be on and off.

Yes I agree @Tanisha.

In which region, Analog circuit will work?

In which region, Analog circuit will work?

What about active, breakdown and linear region?

Saturation and cut off region.