Are the collector and emitter terminals of a transistor interchangeable?

Are the collector and emitter terminals of a transistor interchangeable?

Are the collector and emitter terminals of a bipolar transistor interchangeable? No. Transistors are designed to provide the optimum performance when they are correctly connected.

Can we interchange emitter and collector?

No, we cannot interchange emitter and collector of a transistor due to following reasons: (i) In a transistor emitter is heavily doped and collector is comparatively lightly doped. (ii) In a transistor, the contract area of emitter- collector junction is larger than that of emitter- base junction.

What happens if you connect a transistor backwards?

Yes current can flow in both directions. An NPN transistor backwards is also an NPN. There will still be a reverse beta, however, the backwards NPN transistor won’t work as well as a correctly oriented one will. It’s not recommended.

How the collector of a transistor is doped?

In most transistors, emitter is heavily doped. These bases are lightly doped and very thin, it passes most of the emitter-injected electrons on to the collector. The doping level of collector is intermediate between the heavy doping of emitter and the light doping of the base.

Why does the transistor work with collector and emitter?

The transistor is in reverse active mode. The collector acts as the emitter and the emitter as the collector. This is possible because NPN reversed is still NPN. The performance is worse than in forward active mode, because emitter and collector usually have different doping levels and a different structure.

What happens when you use transistor in reverse?

Now, if you use the transistor in reverse, the emitter becomes the collector and the collector becomes the emitter, and its quite simple to see what happens: (1). As the collector doping is less than the emitter doping, the hole current in the collector (now the emitter) increases, leading to lower beta.

How does the collector emitter relationship work in a led?

Shouldn’t it be the other way, collecting and emitting to the LED? Think of the transistor as a valve or faucet. The base is the knob, the water tends to flow from the positive side (storage tank) to the ground (drain), if you follow the normal “current flow” directions.

What happens when I bias the collector and emitter?

The minority carrier electrons recombine in the basis region. (2.) They get attracted by the CB junction, which is biased in reverse direction. However, the minority carrier electrons cross the CB region, become majority carriers in the collector, and form the collector current.