Quick Answer: What Is PNP Transistor?

What is the function of PNP transistor?

The operation of the PNP and NPN transistors mainly utilizes holes and electrons.

These transistors can be used as amplifiers, switches and oscillators.

In PNP transistor, the majority charge carriers are holes, where in NPN the majority charge carriers are electrons.

Except, FETs have only one sort of charge carrier..

What is PNP and NPN?

As they are normally referred, PNP and NPN sensors are both supplied with positive and negative power leads, then produce a signal to indicate an “on” state. PNP sensors produce a positive output to your industrial controls input, while NPN sensors produce a negative signal during an “on” state.

How does NPN and PNP transistor work?

In an NPN transistor, a positive voltage is given to the collector terminal to produce a current flow from the collector to the emitter. In a PNP transistor, a positive voltage is given to the emitter terminal to produce current flow from the emitter to collector.

Can I use PNP instead of NPN?

Generally, the PNP transistor can replace NPN transistors in most electronic circuits, the only difference is the polarities of the voltages, and the directions of the current flow. PNP transistors can also be used as switching devices and an example of a PNP transistor switch is shown below.

Which is better PNP or NPN?

A NPN transistor has electrons as majority charge carriers whereas the PNP transistor has holes as majority charge carrier. The mobility of electrons is better than mobility of holes. … mobility of electrons is more than hole,so as a result npn transistor are faster than pnp that’s why they are preferred..

How PNP transistor works as a switch?

For a PNP transistor, the Emitter potential must be positive with respect to the Base. Then the transistor operates as a “single-pole single-throw” (SPST) solid state switch. With a zero signal applied to the Base of the transistor it turns “OFF” acting like an open switch and zero collector current flows.

What are the two main functions of a transistor?

Transistor is a kind of solid semiconductor device, which has many functions, such as detecting, rectifying, amplifying, switching, voltage stabilizing, signal modulating and so on. As a variable current switch, transistor can control the output current based on the input voltage.

What is meant by PNP transistor?

A PNP transistor is a bipolar junction transistor constructed by sandwiching an N-type semiconductor between two P-type semiconductors. A PNP transistor has three terminals – a Collector (C), Emitter (E) and Base (B). The PNP transistor behaves like two PN junctions diodes connected back to back.

What is the symbol of PNP transistor?

PNP Transistor Symbol The symbol of P-N-P consists of three terminals emitter, base, and the collector. The arrow is sharply pointing towards the base indicating the flow of current from the emitter terminal to the base.

Where are PNP transistors used?

ApplicationsPNP transistors are used to source current, i.e. current flows out of the collector.PNP transistors are used as switches.These are used in the amplifying circuits.PNP transistors are used when we need to turnoff something by push a button. … Used in Darlington pair circuits.More items…•

How do you wire a PNP transistor?

Example: PNP Transistor CircuitStep 1: The Emitter. First of all, to turn on the PNP transistor, you need the voltage on the base to be lower than the emitter. … Step 2: What You Want To Control. When the transistor turns on, the current can flow from the emitter to the collector. … Step 3: The Transistor Input.

How NPN sensor is used as PNP?

If we don’t have PNP sensor then we can convert NPN sensor output to PNP using a relay. Power supply 24V is provided to brown wire and 0V connected to blue wire of a sensor. Black wire is output. NPN output black wire is connected to pin 13 of relay.

Are NPN and PNP transistors interchangeable?

Answer: NPN and PNP transistors are interchangeable if you remember one simple rule: A bipolar transistor is essentially two back-to-back diodes with the base being the common connection.