2n3906 pinout

2N3906 Pinout

In this post I’m going to discuss the Introduction to 2n3906 pinout  which is a PNP transistor and mainly used for amplification and switching purpose.

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When you are working on any electrical project, you cannot belittle the sheer importance of transistors. They are mainly used for amplification and switching purpose.

2n3906 Transistor pinout

2n3906 Transistors were introduced with the intention of providing cheap electronics and widely replaced vacuum tubes that turned out expensive and carried more space which is not quite feasible for cheap electronic when the cost is a major concern.

2n3906 pinout  Transistors are mainly divided into two types named as PNP and NPN transistor. The 2n3906 is a PNP transistor and comes with three layers i.e. one P-doped layer and two N-doped layers.

2n3906 equivalent

The P-doped layer lies between the two N-doped layers. The 2n3906 consists of three terminals called emitter, base, and collector. All these terminals are used for the external connection with the electrical device.

The base terminal is responsible for the current conduction when the bias voltage is applied at this terminal. The small current at the base terminal is used to control large current at the emitter and collector terminals.

All these terminals are different in terms of size and doping concentrations(2n3906 equivalent). The base is lightly doped and carries small current while the emitter is highly doped and carries a most current of the transistor. The collector terminal is moderately doped and carries a more voltage than the base terminal.

The current at the collector side ranges from 10uA to 100mA which is a result of holes moving from base terminals.

The 2n3906 comes with an ability to work at low power and low currents while voltages remain at the medium level that makes this device suitable for a small load and high gain applications. It comes in two different packages and both are used based on the needs, requirements, and space needed for the electronic project.

Both electrons and holes are used for current conduction while holes are considered as major charge carriers.

When a bias voltage is applied at the base terminal, the holes present at the emitter terminals come and join with the electrons at the base terminal. The base is very thin as compared to emitter so it can’t house holes for a maximum period of time, as a result, remaining holes move towards the collector.

Both PNP and NPN are different in terms of current direction and voltage polarities. In this PNP transistor current flow from emitter to collector, unlike NPN transistor where current flows from collector to emitter.


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