The base is very highly doped and very thin layer so electron gets enough time for the combine with holes. Only a few electrons combine with the holes. The most of electron from emitter continue their journey through the base to collector. Ie (emitter current ) = Ib ( base current ) + Ic ( collector current ) This constitute collector current ( ic ).so this two current is the total emitter current.Įmitter current is the total of base current and collector current. The remainder current passes to the collector region. As the base is a very thin layer and light doped only a few electrons combine with holes. As the electrons flow through p-type they tend to combine with holes.
This current is called an emitter current. Here n-type semiconductors contain electrons as a majority charge carrier so that because of the forward bias electrons start to flow towards the base region. Remember,Įmitter-base junction is always in forward bias and base-collector junction is in reverse bias.Įmitter-base junction is forward bias so that you have to connect n-type emitter to the negative battery terminal and p-type base to the positive battery terminal.Ībove figure shows a forward bias to an emitter-base junction and reverse bias to the base-collector junction. NPN transistor workingīefore the understand working of transistor first clear this below topic because this will make easy for you to understand. Hope you understand if don’t yet not worry read their working below you totally understand how this happens. It is so simple you only have to draw the current direction in the symbol of the transistor. So here current is flowing from base to emitter. Now you know emitter to base is always in forward bias and base-collector is always in reverse bias. One is between emitter and base, second is between base and collector. here we give a two supply to the transistor. This diagram symbol only shows the direction of the current. This diagram is not that much complicated as you think.
#PNP NPN TRANSISTOR SYMBOL HOW TO#
Here we discuss in details about the how to draw a diagram of this transistor. Diagram of transistorĪs a previous blog, we also see this diagram if you did not read that yet read that also- What is transistor? Definition, symbol, construction & terminals of transistor Before going to work let talk about the diagram of NPN transistor. On this basic knowledge, we can easily understand about the working of the transistor. In this transistor emitter and collector is P-type semiconductors and a base is n-type of semiconductors.Īs you know p-type of semiconductors contains majority charge carrier as holes and n types of semiconductors contain majority charge carrier as an electron. The main part of the working of this transistor is the middle part or base part which is p-type.
Here P-type region has very thin layer respect to other two regions. NPN transistor structure you can see below. NPN transistor contains three semiconductors and two PN junctions between them. A device which formed by two n-type semiconductors separated by a p-type semiconductor.
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