Transistor what is collector

The few electrons of the emitter are combined with the hole of the base region and the remaining electrons are moved towards the collector region and constitute the collector current. Thus we can say that the large collector current is obtained by varying the base region.

When the emitter junction is in forward biased and the collector junction is in reverse bias, then it is said to be in the active region. The transistor has two junctions which can be biased in different ways.

The different working conduction of the transistor is shown in the table below. FR — In this case, the emitter-base junction is connected in forward biased and the collector-base junction is connected in reverse biased. The transistor is in the active region and the collector current is depend on the emitter current. The transistor, which operates in this region is used for amplification.

FF — In this condition, both the junction is in forward biased. The transistor is in saturation and the collector current becomes independent of the base current. The transistors act like a closed switch.

RR — Both the current are in reverse biased. The emitter does not supply the majority charge carrier to the base and carriers current are not collected by the collector.

Thus the transistors act like a closed switch. In this type of configuration output current is the same as the input current. Means emitter current is same as base current because of that reason this configuration also called an emitter follower circuit. Common emitter circuit has high input resistance and low output resistance, due to these characteristics this circuit is mostly used in impedance matching applications.

This configuration is able to give high voltage gain but not able to give current gain. Because of that reason in most application common emitter configuration is going to use. Your email address will not be published. Skip to content Search for:. Common collector configuration of the Transistor :- In this type of configuration collector is common terminal between other both emitter and base terminals. By the common collector, we can find the current amplification factor.

So for CC connection, The current amplification factor is the ratio of change in emitter current Ie to change in base current Ib.

Output characteristics : Output characteristics is a curve between output current here emitter current Ie and output voltage emitter-collector voltage Vec at a constant base current Ib. Where Common collector circuit is used? As per we know common collector have high input resistance and low output resistance.

Due to this reason this type of circuits especially used for impedance matching i. Common collector circuit provides high voltage gain but this circuit is not able to give high current gain. It is used as a switching circuit in some application. The high current gain combined with near unity voltage gain makes this circuit a great voltage buffer This type of circuit is also used for circuit isolation.

There are typically three electrical leads in a transistor, called the emitter, the collector, and the base—or, in modern switching applications, the source, the drain, and the gate. In plastic casing, one side of the transistor is Flat which is the front side and the pins are arranged serially.

To identify the pins, keep the front flat side facing you and count the pins as one, two etc. Thus CBE. Similarly touch the negative probe to the pin-3 collector with respect to the pin The collector region is the largest of all regions because it must dissipate more heat than the emitter or base regions.

It is designed to be large because in order to dissipate all the heater, the extra surface area allows it to do so. One transistor circuit configuration that can be used to very good effect in many instances is the Darlington Pair. It is primarily used because it offers a particularly high current gain and this also reflects into a high input impedance for the overall Darlington circuit when compared to a single transistor.

What is emitter collector and base? Category: home and garden home entertaining. 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. Why is base current small?

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