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. A device which formed by two p-type semiconductors separated by an n-type semiconductor.