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Pnp transistor definition12/16/2023 ![]() ![]() ![]() Holes are the current carriers in p-n-p transistor however the current in the outer circuit is always due to flow of electrons. Simultaenously a covalent bond is broken near th emitter electron the electron so produced enter the positive terminal of the forward bias battery and the hole starts its journey towards the emitter base junction. In working of p-n-p, as each hole reaches the collector an electron is emitted from the negative terminal of battery and the hole is neutralized. The emitter current I e is the sum of base current and the collector current. As the base layer is very thin the collector is kept at high negative potential, almost all the holes are attracted by the collector, producing a hole-current between the emitter and collector (See figure) On reaching the base emitter junction a small fraction of total number of holes with electrons to get neutralized. In a p-n-p transistor, when the emitter is forward biased, the holes in the emitter and the electrons in the base begin the move towards the junction, holes in the emitter and the electrons in the base begin to move towards the junction, holes being attracted by the negative terminal and the electrons by the positive terminal of the battery. To explain the working of both NPN and PNP transistor starting with an example.Action of p-n-p Transistor. The transistor is the PN junctions placed back to back. The transistor is act as amplifier and also a switch, which can able to boost the input signals to high amplitude or it can turn on or off the circuit several times per second. The base junction is very thin and lightly doped in it. When the collector base junctions are in reverse bias then the circuits offer a high resistance. If the emitter-base in forward biased then it offering a low internal resistance to the transistor. The emitter base biasing determining the internal resistance of the transistor. The base junction is connected with two other junction of collector and emitter. The large in size area of collector so it can able to collect most of the electrons supplied by the emitter.īase : The center junction of the transistor is known as the base. The collection section is moderately doped. ![]() The collector is like the receiver and emitter is the electron provider. Support Center - Help topic PNP transistor outputs are called sourcing outputs because they source current from the output to the load. ![]() Which controlling the number of electrons the emitter section emits.Ĭollector : This pin section will collecting the majority portion of the charge carrier or the electrons are mostly collected by the collector pin. For more understanding, the emitter emitting the electrons to the base area. The emitter pin is connected to the forward bias with respecting to the base pin, so majority of charge carries to the base. The each terminals of the diode is explained below.Įmitter : The pin emitter carries majority of charges. Expanded as Emitter, Collector and Base respectively. The transistor have three terminals named as the E, B and C. The main difference of the NPN and PNP transistor is the direction of the current. The arrow indicating in the transistor figure is denoted as the direction of flow of conventional current in emitter to base in forward direction. The Symbol of PNP and NPN transistor shown given below. Similarly, If the two N type blocks are joined with P type semiconductor is known as NPN transistor. The two blocks of P type joined with the N type semiconductor is known as PNP transistor. The both transistor are designed with two blocks of either P-Type semiconductor of N-Type semiconductor. Symbol : Full Form : Negative Positive and Negative : Positive Negative and Positive : Direction of Current Collector to Emitter. Transistors are in two types, namely NPN transistor and the other one is PNP transistor. NPN Transistor PNP Transistor Definition : Transistor in which two n-type layer are separated by one P-type layer : Two blocks of p- types semiconductors are separated by one thin block of n-type semiconductor. ![]()
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