![]() ![]() So before any transistor test, we need to know about the structure of the BJT. To watch Free Learning Videos on physics by Saransh Gupta sir Install the eSaral App. 4 Testing The Transistor (Good or Damaged) This test is only applicable for BJT transistors. If you enjoyed this explanation then don’t forget to share it with your friends. So, that’s all from this blog, I hope you get the idea about the Working of NPN and PNP transistor. The holes of the P region (emitter) are rippled by the positive terminal of battery $\mathrm$ Comparison table between CB, CE and CC configuration The emitter region in a PNP-junction transistor is more heavily doped than the base region, so that asked in Physics by Gaurangi ( 25. A PNP transistor as seen in the picture above includes three terminals: Emitter Collector Base Emitter Emitter is the section that supplies the majority of charge carriers. the use of opposite polarity for the three electrodes (collector, base and emitter). JEE 2023 Warrior – Double Power Course For DroppersĮnroll NowHey, do you want to learn about the Working of NPN and PNP transistor? if yes. PNP Transistor As the name suggests, a PNP transistor has a layer of N-type semiconductor sandwiched between two P-type semiconductors. using npn and pnp transistors, source current, sink current.Class 10 Term 1 Question Paper with Answer Key 2021.The emitter pushes the holes towards the base. The emitter is always forward biased with respect to the base. Class 10 JEE/NEET 2025 Agni (Integrated) Course A PNP transistor as seen in the picture above includes three terminals: Emitter Collector Base Emitter Emitter is the section that supplies the majority of charge carriers.The NPN transistor behaves like two PN junctions diodes connected back to back. Figure 7.2: A simplified structure of the NPN transistor. An NPN transistor has three terminals a collector, emitter and base. Figure 7.1: Circuit symbols of (a) NPN and (b) PNP transistors. Generally, PNP Transistors require a negative (-ve) voltage at their Collector. Class 9 + 10 + JEE/NEET 2026 Shakti (Integrated) Course An NPN transistor is the most commonly used bipolar junction transistor, and is constructed by sandwiching a P-type semiconductor between two N-type semiconductors. in the first tutorial, Common Base, Common Emitter and Common Collector.Part 12 discusses ways of driving a PNP transistor when the load must be driven with a higher voltage than the microcontroller. The microcontroller would likely be damaged in this situation. PNP transistor is one kind of bipolar junction transistor and it includes three terminals known as collector, emitter, and base. Worse yet, the microcontroller output pin will be seeing more than 5V, which greatly exceeds the usual limitation of the microcontroller supply voltage plus 0.3V. Unless the transistor has exceptionally low gain, it will be turned on even though with the output pin high it should be turned off. Ib = (Vcc – Vp0 – Vbesat)/R1 =( 12 – 5 -. PNP Transistor works when Base Emitter junction is forward biased and the Base Collector junction is reverse biased. Assume the output pin is high, at 5V, and the base resistor is 1000 ohms. Consider the following.: Suppose the load voltage is +12V and the microcontroller is running at 5 volts. The majority charge carrier is pushed toward the base by the emitter-base junction, resulting in the emitter current. PNP’s emitter-base junction is forward biased, while the collector-base junction is reverse biased. PNP transistors have a p-type base and an n-type emitter and collector. Normally it is best to use the same voltage to drive the load that is used to power the microcontroller. Emitter, base, and collector are its three terminals. One additional thing you need to be careful with PNP high side switches is the voltage used to drive the load. ![]() Part 12 - Switching Higher Voltage Loads with PNP Transistors Part 8 - Using PNP Transistors as High Side Switches Part 7 - Using Transistors to Switch Higher Power Loads
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