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.
Is NPN and PNP transistor same?
An NPN transistor has a piece of P-type silicon (the base) sandwiched between two pieces of N-type (the collector and emitter). In a PNP transistor, the type of the layers are reversed. ... NPN and PNP transistors have very similar schematic symbols . The only difference is the direction of the arrow on the emitter.
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. ... On the left is an NPN (negative-positive-negative) transistor and on the right is a PNP (positive-negative-positive) transistor.
Can I use a different transistor?
Fortunately it is normally possible to use a replacement transistor type as there is often a considerable degree of overlap between the specifications of different types of transistor, and by looking at the basic specifications it is normally possible to choose the correct transistor replacements.
How do I convert PNP to NPN?
If you have the exact NPN equivalent you only need to mount the circuit as it is drawn, so that the base, collector and emitter terminals of the NPN are connected where base, collector and emitter of the PNP should go, and then reverse the power supply polarity.
Is PNP normally open?
PNP – (PNP transistor) NO – normally opened, that means there is no voltage on the output while the sensor is not actuated (see picture, PNP sensor output connector is no. 4).
What is P in PNP transistor?
What is a PNP Transistor? The term ‘PNP' stands for positive, negative, positive, and also known as sourcing. The PNP transistor is a BJT; in this transistor, the letter ‘P' specifies the polarity of the voltage necessary for the emitter terminal .
What can replace transistor?
- Quantum Computing. Google, IBM, Intel and a whole host of smaller start-up companies are in a race to deliver the very first quantum computers. ...
- Graphene and Carbon Nanotubes. ...
- Nanomagnetic Logic.
Can I replace mosfet with transistor?
In general we can easily replace a BJT with a MOSFET, provided we take care of the relevant polarities. ... Remove the base resistor from the circuit because we don't typically need it anymore with a MOSFET. Connect the gate of the N-MOSFET directly to the activation voltage source.
Which transistor is best?
- #1 NPN – 2N3904. You can find most often NPN Transistors in low-side switch circuits. ...
- #2 PNP – 2N3906. For high-side switch circuits, you need a PNP style BJT. ...
- #3 Power – TIP120. ...
- #4 N-Channel (Logic Level) – FQP30N06L.
What is PNP NPN?
PNP = Switched Positive . NPN = Switched Negative. “Switched” refers to which side of the controlled load (relay, small indicator, PLC input) is being switched electrically.
How do PNP and NPN transistors 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.
How PNP transistor works as a switch?
PNP transistor works same as NPN for a switching operation, but the current flows from the base . ... In this switching, base current flows when the base voltage is more negative. Simply, a low voltage or more negative voltage makes the transistor to short circuit otherwise, it will be open circuit.
Is PNP negative common?
For PNP sensors, the Negative side is connected to common . For NPN sensors, the Positive side is connected to common.
Is NPN better than PNP?
As the electrons have higher or faster mobility than holes, the conductivity also more. For this reason, NPN transistor
Is NPN or PNP more common?
PNP sensors tend to be more commonly used . There are several factors that can influence what type of output to use, but none is determinant, in the market there are sensors of both types as well as PLC cards. In Europe it is more common to use PNP, whereas in Asia it is more common to find NPN.
