Pnp transistor 2n3906 is commonly used pnp bipolar junction transistor. This types of the transistor also use a switching in may electronics circuits. These transistors are mainly used in an amplifier circuit to amplifies signal. Pnp transistor has same useful as npn transistor. Different connections of pnp transistor are. You can configure pnp transistor with the help of its terminals emitter, base, and collector. Pnp transistor you can configure in circuit with different configurations. In npn current flows by electrons and in pnp current flows because of holes. The only difference between these two types of transistor is polarity. We only have to replace npn instead of npn transistor. Generally, PNP transistor applications are the same as applications of npn transistor. Now we are going to see application of pnp transistor. In previous we see applications of npn transistor. Hope now you know how actually pnp transistor works? Let’s go forward about applications of pnp transistor applications Pnp transistor applications – Here base current is in microampere So if we can neglect that base current than,Įmitter current ( Ie ) = collector current ( Ic ) You have to note current conduction in pnp transistor is by holes.Įmitter current ( Ie) = base current (Ib) + collector current ( Ic)
We can tell emitter is almost equal to collector current. This current (Ic ) is 95% of emitter current. Other electrons move from base to collector. This base is very thin and lightly doped region so, very few electrons combine with holes. The base is n-type so this holes combine with electrons and constitute current ( Ib). P type semiconductor contains holes and This holes going to transfer to the base. The forward bias between emitter and base cause current to flow from p type emitter to n type base. In the above figure shows the basic connection of pnp transistor. Here emitter-base junction is in forward bias and Base- collector is in reverse bias. The base is a thin layer and middle region. Check out detailed about transistor regions. Pnp transistor construction –Īll these regions have different width in pnp transistor. Note current can’t able to flow from base to emitter because it is in reverse bias.
Now current is produced from an external source and this current easily pass from emitter to base because it is in forward bias. Base-collector junction is connected is always reverse bias so p type of collector is connected to negative of battery Vcb and base is connected to the positive terminal of battery Vcb. Emitter-base junction is always connected in forward bias so p semiconductor is connected to the positive terminal of battery Vcc and base n type semiconductor is connected to the negative terminal of battery Vcc. Here two external sources are connected with pnp transistor. Why is the current direction in pnp transitor from an emitter to base?Īs per above diagram you saw current is flowing from emitter to base. Here current flows from emitter to base region.
As we see in npn transistor symbol here only change in direction of the emitter-base current. Pnp transistor symbol is shown in the figure. The base region is an n-type semiconductor in which majority charge carrier is electrons. Here emitter and collector is p-type semiconductor so they contain majority charge carrier as holes. middle region base has a narrow layer or smallest width. Here you can see every region have the different width. This transistor has mainly three regions. This type of transistor fig you can see below. Pnp transistor is made by two p type semiconductor and one n type semiconductor. Here we cover pnp transistor definition, symbol, construction, working, operation, application, uses, pnp transistor as switch, pnp transistor equations, pnp transistor amplifier, pnp transistor 2n3906, bc 557 PNP transistor definitionĪ device which formed by two p-type semiconductors separated by an n-type semiconductor.