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Showing Results For: Bipolar Transistors

Bipolar Transistors

What are Bipolar Transistors?

Bipolar transistors are solid state-type devices consisting of three-pin composed of silicon layers. A bipolar transistor is manufactured to enhance the voltage, and a bipolar transistor can work as a switch. Transistors are classified into two main types positive negative positive (PNP) or negative, positive negative (NPN).

How a Bipolar transistor is manufactured

Two signal diodes are linked back-to-back to form two PN junctions that are coupled in series and share a common P or N terminal to create bipolar transistors. By nature, silicon does not often carry electricity well. However, we may alter the behavior of the material and the electrons by adding specific compounds or impurities to silicon. This practice is known as doping. The doping procedure enhances the semiconductors' electrical conductivity.

Application of the bipolar transistor

  • Switching circuits
  • Amplification of the current
  • Converters
  • Switch controller
  • Temperature sensors
  • Electronic switches
  • Current amplifiers
  • High driving potential

Where are bipolar transistors used?

Bipolar transistors are still utilized in digital circuits for switching and for signal amplification. For high voltage switches, radio-frequency amplifiers, or switching high currents, specialized kinds are utilized. A form of transistor that employs both electrons and electron holes as charge carriers is known as a bipolar junction transistor (BJT). A unipolar transistor, like a field-effect transistor, employs just one type of charge carrier in contrast. A bipolar transistor can be used for switching or amplification by allowing a little current to be injected at one of its terminals to control a much greater current flowing between the terminals.

How do bipolar transistors work?

Switching and amplification are the two possible uses of bipolar transistors. By applying a signal voltage to the transistor, which is made up of three layers of doped semiconductor material, the discrete component may switch between being an insulator and a conductor. With the help of this smart modification, transistors may now do either switching (digital electronics) or amplification (analog electronics), two fundamental tasks. Transistors come in plastic containers or metal can variants, and mounting choices include panel, surface, and through-hole. The Base, Collector, and Emitter are the three terminals or pins shared by everybody. They are also available as;

Digital transistors

Are constructed from a semiconductor substance, often silicon, which carries the current (or electricity) with negligible resistance. Additionally, they often contain three terminals or more for connecting to an external circuit with ease.

UJT transistors

Built from a bar of silicone that is weakly doped in the N-type, with a little bit of P-type material connected to one side. The silicon bar has a very high resistance since it is just mildly doped.


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