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How many types of BJT transistors are there?
two types
A bipolar transistor (bipolar junction transistor: BJT) consists of three semiconductor regions forming two junctions. There are two types of structure: npn and pnp. Products with npn up to 800 V and pnp up to -600 V are available. In addition, there are also bias resistor built-in transistors (BRTs).
What are the different configurations of BJT?
The three basic configurations of a BJT are (a) common emitter (CE), (b) common base (CB), (c) common collector (CC) or emitter follower. These basic configurations are shown in Figure 1.
What are the most commonly used BJT transistors?
Best Transistors: BJTs
- #1 NPN – 2N3904. You can find most often NPN Transistors in low-side switch circuits.
- #2 PNP – 2N3906. For high-side switch circuits, you need a PNP style BJT.
- #3 Power – TIP120.
- #4 N-Channel (Logic Level) – FQP30N06L.
What makes up a bipolar junction transistor ( BJT )?
What is a Bipolar Junction Transistor (BJT)? A bipolar junction transistor is a three-terminal semiconductor device that consists of two p-n junctions which are able to amplify or magnify a signal. It is a current controlled device. The three terminals of the BJT are the base, the collector, and the emitter.
What happens when a BJT is used beyond its power rating?
When BJTs are operated beyond their power rating or reverse breakdown voltage then BJT will not work properly or may be damaged permanently. In case of reverse biasing, the emitter-base junction will cause avalanche breakdown which will permanently damage the current gain of the bipolar junction transistor.
Which is the highest current configuration in a BJT?
The input is applied between base & emitter while output is taken between collector & emitter. It can be simply recognized by looking at the circuit. If the emitter is grounded while input and output are taken from the base and collector respectively. This configuration has the highest current and power gain among all three configurations.
Where does the normal operation of the BJT occur?
It is also known as linear region. This region is in between the cutoff region and the saturation region. The normal operation of BJT occurs in this region. In saturation region, both of the junctions of the BJT are in forward bias. This region is used for the ON-state of a switch where;