Pnp Transistor Schaltplan. The pnp transistor has very similar characteristics to their npn bipolar cousins except that the polarities or biasing of the current and voltage directions are reversed for any one of the possible three configurations looked at in the first tutorial common base common emitter and common collector. In common emitter configuration of pnp transistor emitter is the terminal common to both the input side and output side.
The positive voltage to the emitter allows current to flow from the emitter to the collector given that there is negative current to the base current flowing out of the base to ground. For the pnp transistor the base terminal is always negatively biased with respect to the emitter. The signal to be amplified is applied between base and emitter forming the input circuit while the amplified output voltage is developed across load impedance in the collector to emitter forming the output circuit.
A pnp transistor is a type of bipolar junction transistor which is composed of three layers where n doped layer is sandwiched between two p doped layers.
The pnp transistor has very similar characteristics to their npn bipolar cousins except that the polarities or biasing of the current and voltage directions are reversed for any one of the possible three configurations looked at in the first tutorial common base common emitter and common collector. The construction and terminal voltages for an npn transistor are shown above. Reducing the gain of the npn or pnp transistors can prevent the parasitic thyristor latch up. A properly biased pnp transistor the pnp transistor works essentially the same as the npn transistor.
