Emitter-Switched Bipolar Transistors

A bipolar transistor or bipolar junction transistor (BJT) is a solid-state three-pin device made from three layers of silicon. A BJT is designed to amplify a current but can also function as a switch. There are two main types; positive negative positive (PNP), and negative positive negative (NPN).

Whether you’re looking for a PNP or NPN power transistor, browse our selection below to find the right component for your application.

How are emitter-switched bipolar transistors made?

A bipolar transistor component is made by joining two signal diodes back to back to create two PN junctions, connected in series that share a common P or N terminal. By nature, silicon does not normally conduct electricity well. However, when silicon is treated with certain chemicals or impurities, we can make the material and electrons behave in a different way. This process is called doping. Doping improves the semiconductor’s ability to conduct electricity.

What does a bipolar transistor do?

Emitter-switched bipolar transistors have two possible functions; switching, and amplification. Due to the device’s three layers of doped semiconductor material, supplying the transistor with a signal voltage enables the discrete component to act as an insulator or a conductor. This clever change provides the transistors with two basic functions - switching (digital) electronics or amplification (analog) electronics.

What are the different types of bipolar power transistor?

Transistors are available in panel, surface and through hole mounting options in plastic package or metal can versions. All have three terminals or pins; the Base, the Collector, and the Emitter.

Where are bipolar transistors used?

Transistors are one of the most widely used discrete components in electronic designs and circuits. Transistors are used for the amplification of all types of electrical signals in circuits, made up of individual components rather than integrated circuits (ICs).
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ON Semiconductor, FJPF2145TU, Emmitter Switched, NPN Power Transistor 5 A 0.209V, 3-Pin TO-220F
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