![]() This entire casing is extremely lightweight which adds to the advantage of the transistor and make it a portable device. Light Weight: The entire arrangement of the transistor is packed in a single case with heat sink and three terminals.All thanks to the inventors of transistors. We need not to work anymore with that large size vacuum tubes based computers. Compact Size: These small size transistors have ushered to design compact processors.Cut Off Region: In this transistor works as a closed switch.In this region, the transistor acts as ON switch. Saturation Region: In this region, the transistor is operated when we need switching operation.Active region: This region is utilized for the operation of the amplifier.Mainly, the transistors work in three regions that are as follows: This movement of electron and holes in the circuit result in the generation of current. Thus, 90-95% of the electrons emitted by an emitter will get recombined with holes in collector region. Thus, only a few electrons will recombine at the base and the remaining will start moving towards collector. Please note that we have considered NPN transistor so majority charge carriers in emitter will be electrons. In this condition, the majority charge carriers in emitter region will move towards the base region.ĭue to moderate doping and small size of the base terminal, only 5-10% of the charge carriers entering base will recombine. Unbiased means it is not provided with any external voltage source. Let’s consider an NPN transistor which is unbiased. Thus, it is necessary for the collector terminal to be large enough so that it can dissipate the heat and the device may not burn out. Collector: The collector terminal is moderately doped, and the size of the collector region is slightly more than emitter region because all the charge carriers coming from the emitter recombine at base and heat is released in this process.The doping intensity of base is also less than emitter and collector for the same reason mentioned above. The size of the base is always kept small so that charge carriers coming from the emitter and entering base will not recombine in the base region and will be directed towards the collector region. ![]()
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