Why SCRs, Diodes, Transistors are called Active Device?


SCR, Diode, Transistor called Active Device


Hey, today we are going to know why SCRs, Diodes, Transistors are called Active Device. According to energy required for operation, there are two types of electronic component or device one is active device and another is passive device. First of all, let's know what is the active device and passive device.

Active Device: Active devices are those semiconductor devices which need some voltage to start their operation. For example, diode transistors

Passive Device: Passive devices are those semiconductor devices which does not need any voltage to start their operation. For example, resistor, inductor, and capacitor


Why Diode is called Active Device?


The diode is an active device because to start its operation we need to give some voltage across it. The small voltage to start the operation of the diode is called the Threshold Voltage.
We know that the threshold voltage of a silicon diode is 0.7V which implies that the diode will start its operation after giving 0.7V across it.
The threshold voltage of a germanium diode is 0.3V

Why Transistor is called Active Device?


Transistor also needs some voltage to start its operation that's why it is called Active Device. To properly operate a transistor we need to give proper biasing. A transistor is nothing but a connection of two PN Junction Diodes. In fact, in a Transistor, we need to give two voltage. For example, in a BJT we need to give voltage across Collector to Base and Emitter to Base.

Why SCR is Called Active Device?


SCR means Silicon Controlled Rectifier. SCR is a semiconductor device that needs some voltage across it to start its operation that's why it is called Active Device. SCR also have PN junctions. It has four layers and three junctions. We need to give sufficient voltage across its junctions to start the current conduction.

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Why SCRs, Diodes, Transistors are called Active Device? Why SCRs, Diodes, Transistors are called Active Device? Reviewed by Author on 18:02 Rating: 5
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