Because, it is the base region that controls the small amounts of current flow which then controls large amounts of current flow in the emitter and then to the collector region.So, the base region actually works as the input and both the emitter and collector regions as output.This is must for an emitter-base junction to act as a diode.For a PNP transistor, an emitter only operates if the base voltage is more negative than it.When it is turned on, then the current starts flowing from the Emitter-base region towards the base region and then finally to the collector.For turning on the PNP transistor, you need to make sure that the voltage present on the base is lower than that of the terminal.That’s what makes PNP transistor a current-controlled device.īipolar Junction Transistors (BJT) always has its arrow in the emitter region which basically shows the direction of flow of the conventional current. And, in these transistors all the voltage polarities are reversed, because in this current sinks in to the base region.
And, the minor current carriers are electrons. The major types of current carriers in these types of transistors are holes. And, the right one is the Collector-Base diode (CB).The left one is the Emitter-Base diode (EB).So, basically PNP transistor is a combination of two diodes which are connected back to back. It also has a ‘Collector’ region which is highly positive just next to the negative ‘Base region’ (B). Collector-Base junction: It is a junction where the positive doped collector meets with the base region (B) that is highly negative.It is represented by ‘EB’ and has an ‘Emitter’ and an ‘Emitter region’ just next to the ‘Base region’. Emitter-Base junction: It is a junction where the positive doped emitter meets with the base that is a negative region.The PNP transistor is divided into three distinct regions that are p-type, n-type and p-type.Īnd, the two pn junctions formed in this transistor are as follows: It is a device in which two p-regions together sandwich one n-region and gives us two pn junctions. PNP transistor circuit Components of a PNP Transistor There are different types of transistors, for example NPN transistor is also an example of Bipolar Junction Transistor (BPT). It is a device which is controlled by current. So, basically in this type of transistor two p-type (positive) materials dope a single n-type (positive) material and the PNP configuration is established, and it is referred to as a PNP transistor. In PNP transistor, PNP stands for Positive-Negative-Positive configuration. PNP transistor is the types of bipolar junction transistor.
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