PNP Bipolar Junction Transistor BJT component.

PNP Bipolar Junction Transistors BJTs  have an N type material (base) sandwich between two areas of P type material (collector and emitter). The amount of negatively charged electron flow that passes through collector to emitter is controlled by how much electron flow passes through the base to emitter.

Since this component is usually viewed as the electricity path moving from negative to positive, we can either think of it as an imaginary negative current or as an electron flow. Early scientists thought that electricity flowed from positive to negative, and so we trace most electrical paths of a circuits as if it is moving positive to negative, which we call (conventional) current, even to this day. Now we know that electricity is electrons moving (flow) from the more negative to the more positive side of the circuit.

Check the datasheet for the part number and package (component appearance) for pin layout and specific properties of the exact transistor you are using.

PNP Bipolar Junction Transistor BJT terminals.

  • Collector – P type material attached to a terminal that heads towards the negative side of the circuit
  • Base – N type material sandwiched between Collector and Emitter, attached to a terminal that connects to the control signal that ultimately determines how much current can pass through .
  • Emitter – P type material attached to a terminal that connects to the more positive side of the circuit.

Gain

When you pass a certain amount of current/electron flow through the base to emitter of a bipolar junction transistor, a multiple amount of current (known as the transistor’s current gain) will be permitted to pass from collector to emitter. The exact gain of a transistor varies between part number and even then there are manufacturing differences and operating conditions that affect a particular transistors gain. Transistor circuits are designed to not rely on a transistor’s gain.

PNP 2N2907 Bipolar Junction Transistor BJT BJTs gain demonstration beginner learning electronics video below. Click here to watch directly on YouTube!

PNP Not Gate using 2N2907 bipolar junction transistor BJT BJTS for beginner learning electronics video below. Click to watch directly on YouTube!

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Multimeter voltage measurements 2N2907 PNP BJT BJTs NOT gate video below. Click here to watch directly on YouTube!


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