8/30/2023 0 Comments A transistor definition![]() In an NPN transistor, the arrowhead faces the emitter region. It shows that emitted is positive for base and collector. In the PNP transistor, the arrowhead faces the base region. It denotes the conventional current flow direction. The arrowhead always represents the current flow direction emitter region to base or base to emitter (from P to N) in every transistor. From these characteristics, we should know collector and emitter cannot be exchanged. The Collector layer is also faintly doped to receive more transporters. The base layer is opposite to the emitter because it is faintly doped. The emitter layer is highly doped.īut the emitter has to provide most charge carriers. The right side part of the transistor is known as the Collector layer(C). The left side part of the transistor is the Emitter layer (E). When the external power supply is applied, the transistor is ready to be amplified. Bipolar Junction TransistorsĪ device used to amplify a signal consisting of a three-layered semiconductor material also with a two P-N junction is called Bipolar Junction Transistors (BJT). ![]() The right-side layer of the transistor is known as the Collector layer(C). The left side layer of the transistor is the Emitter layer (E). The thickness of the base layer is 25 microns. The middle part of the transistor is known as Base layer (B). They are named emitter, base, and collector. Three layers formed in between the two P-N junctions. Silicon or Germanium are the two semiconductors used in Bipolar junction transistors. Bipolar junction transistor is a semiconducting device.
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