What is the difference between a NPN and PNP transistor?
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.
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.
How do you remember NPN and PNP transistor?
Remember the direction of PNP & NPN Transistor
- P = Points N = Never.
- N = IN P = Points.
- P = Permanently N = iN.
Which is better NPN or PNP?
The majority charge carriers in an NPN transistor are electrons and the majority carriers in a PNP transistor are holes. The electrons have better mobility than holes. Therefore, NPN transistors are preferred over PNP transistors.
Why do we use NPN and PNP transistor?
NPN transistors are used as a sink to the current i.e., current flows to the Collector. It means the current points inwards. PNP transistors are used as a source to the current i.e., current flows out of the Collector. In the NPN transistor, electrons are important current carriers.
Why NPN transistor is preferred over PNP?
Can I use any NPN transistor?
Therefore, the transistor acts as a short circuit. Are NPN transistors generally interchangeable? No. They cover a wide range of maximum collector voltage, power dissipation, gain, and cutoff frequency.
How do you read a transistor?
Connect the base terminal of the transistor to the terminal marked positive (usually coloured red) on the multimeter. Connect the terminal marked negative or common (usually coloured black) to the collector and measure the resistance. It should read open circuit (there should be a deflection for a PNP transistor).
Can PNP transistor work as a switch?
PNP Transistor Switch We can also use the PNP Transistors as a switch, the difference this time is that the load is connected to ground (0v) and the PNP transistor switches the power to it. To turn the PNP transistor operating as a switch “ON”, the Base terminal is connected to ground or zero volts (LOW) as shown.
How do you trigger a PNP transistor?
First of all, to turn on the PNP transistor, you need the voltage on the base to be lower than the emitter. For a simple circuit like this, it’s common to connect the emitter to the plus from your power source. This way, you know what voltage you have on the emitter.
What is the difference between NPN and PNP transistor?
In a PNP transistor, the majority charge carriers are holes while in NPN the majority charge carriers are electrons. You may also want to check out these topics given below! What is the Difference Between NPN and PNP Transistor?
Why do NPN transistors shut off at low voltage?
And as you decrease current to the base of a NPN transistor, the transistor conducts current across from collector to emitter less and less, until the voltage supplied to the base is under the threshold voltage amount of 0.7V, at which point the transistor no longer conducts across collector to emitter and shuts off.
What is a bi-bipolar transistor switch?
Bipolar transistor switches are used in many applications to switch a DC current “ON” or “OFF”, from LED’s which require only a few milliamps of switching current at low DC voltages, or motors and relays which may require higher currents at higher voltages.
What is the difference between base BJT and NPN?
BJTs are current-controlled transistors that allow for current amplification. A current at the base of the transistor allows for a much larger current across the emitter and collector leads. NPN and PNPs are exactly the same in their function, they provide amplification and/or switching capability.