The downside of BJTs is because they have low input impedance, they can cause loading in a circuit.

Because of this low impedance also do BJTs have the highest amplification of all The low impedance (or resistance) allows current to flow through the base of the transistor. This is because BJTs have the lowest input impedance Overall, bipolar junction transistors are the only type of transistor which is turned on by current input (input into the base). The other type of charge, holes, are a minority. To the collector forms the base of the majority of current flow through the transistor.

A NPN transistor is one in which the majority current carrier are electrons. A small current entering in the base region of the transistor causes a much larger current flow from the emitter to the collector region.īipolar junction transistors come in two main types, NPN and PNP. Bipolar Junction transistors, unlike FET transistors,Īre current-controlled devices. Bipolar Junction Transistors are transistors which are made up of 3 regions, the base, the collector, and the emitter.

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