Pnp vs npn transistor6/27/2023 ![]() As you start to add current to the base (start to open the tap) the current passing between the collector and the emitter starts increasing (more water comes out). With no current (tap closed) no current passes between the collector and the emitter. Unfortunately, for us software developers the real world isn’t binary, and as current ramps up on a transistors base it’s like opening a tap. Notice the collector and emitter have moved.Īs you can see the NPN transistors are controlled by a positive voltage on the base and PNP transistors are controlled by a negative voltage on the base.Īs mentioned above, the resistor requires current flowing for control. The arrows point the direction of current in a PN junction. Here is a circuit diagram of the two types: (MOSFETs are a voltage driven transistor, but we won’t talk about them here.) All BJT transistors are current driven, this means they depend on the amps passing through them to open and close the switch. NPN and PNP transistors are types of Bipolar Junction Transistors. ![]() ![]() Warning: i’m a beginner and am only covering basic switching. I’m also going to purposely avoid talking about silicon in this post. This article aims to answer this question in a way that I can understand and only covers switching. Many of the articles that were read to research this topic, went into the minute details of how a NPN and PNP transistor is born (and back) but didn’t seem to answer my question. How to choose between a NPN or PNP transistor? (For beginners) - Niall Bunting Home Subscribe How to choose between a NPN or PNP transistor? (For beginners)
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