Can we change emitter and collector of a transistor?

Can we change emitter and collector of a transistor?

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.

How can PNP transistor be controlled?

First of all, to turn on the PNP transistor, you need the voltage on the base to be lower than the emitter. For a simple circuit like this, it’s common to connect the emitter to the plus from your power source. This way, you know what voltage you have on the emitter.

Can we interchange the source and drain terminals in a FET circuit can we do the same with the emitter and collector terminals of a BJT circuit?

Theoretically you should not. The doping of base, emitter and collector all are different, with emitter being the most doped. But although emitter is more doped than collector, width of collector is more than emitter so total number of charge carriers remains almost same in both emitter and collector.

Why can’t we interchange emitter and collector in a transistor?

We need emitter doping to be highest, while in reality collector doping is less than emitter doping. Hence we can not exchange emitter and collector.

What is emitter and collector in transistor?

Transistors are composed of three parts ‘ a base, a collector, and an emitter. The base is the gate controller device for the larger electrical supply. The collector is the larger electrical supply, and the emitter is the outlet for that supply.

How can a PNP transistor be turned off?

For a PNP transistor, the Emitter potential must be positive with respect to the Base. Then the transistor operates as a “single-pole single-throw” (SPST) solid state switch. With a zero signal applied to the Base of the transistor it turns “OFF” acting like an open switch and zero collector current flows.

Which is correct for PNP transistor?

The correct option is (b) + ve terminal 2, -ve terminal 1, resistance high. Explanation: p-n-p transistor: Positive at terminal 2 and negative at terminal 1 implies p-n junction is reverse biased and hence offers high resistance.

How can I replace NPN with PNP?

For example, if you build a simple current generator with a transistor and a few resistors (base divider, emitter resistor and load on the collector), then to change npn to pnp, with the same power supply, you need to put in the transistor with C and E mirrored, and mirror the resistors as well (or otherwise.

What is transistor emitter?

Why can’t we interchange the emitter and collector?

We need emitter doping to be highest, while in reality collector doping is less than emitter doping. Hence we can not exchange emitter and collector. Because emitter is highly doped region and collector is moderately doped.

What happens when emitter collector terminals are interchange?

Now if emitter and collector are interchanged the following effects will happen: The collector will act as emitter and will supply charge carriers and since it is lightly doped the number of charge carriers supplied will be less and so the current will reduce.

What is common emitter configuration of NPN transistor?

Common emitter configuration can be applied on both types of transistor, PNP transistor, and NPN transistor. Here we especially talk about common emitter configuration of bjt. For common emitter configuration of NPN transistor, we take an emitter terminal is common between the input and output circuit of the transistor.

What is the role of the base in PNP transistor?

The emitter of the PNP transistor has holes ( positively charged) as a majority carrier. When the positive voltage is applied at the emitter with respect to the base, the holes move from the emitter to base region. The emitted holes recombine with the negatively charged electrons of the base. The base has very fe

Why can’t we change the position of the emitter and collector?

We cannot change their positions because doping concentrations are different for emitter , collector and base . This is how it is providing current due to to charge carriers also known as BJT (bipolar junction transistor)

Why is the collector voltage of a bipolar NPN transistor positive?

Also the Collector supply voltage is positive with respect to the Emitter ( V CE ). So for a bipolar NPN transistor to conduct the Collector is always more positive with respect to both the Base and the Emitter.