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Types of Transistors
Depletion MOSFET Transistors:
The Depletion Metal Oxide Semiconductor Field Effect Transistors (MOSFET) are slightly different from FET Transistors in a way that they have larger input impedance voltage and they normally do not draw any current on its gate. When a small voltage is applied to the gate of the MOSFET, then the current stops flowing from the Drain to the Source.
They are classified into two main types:
- N-Channel Depletion MOSFET
- P-Channel Depletion MOSFET
N-Channel Depletion MOSFET: They are normally ON, but a small negative voltage that is applied to the gate can stop the flow of the current from the Drain to the Source.
P-Channel Depletion MOSFET: They are also always ON, but a small positive voltage applied to the gate can stop the current flowing from the Source to the Drain.
They are the slightly different from the Depletion MOSFET. It is also classified in to two main categories.
- N-channel Enhancement MOSFET
- P-channel Enhancement MOSFET
N-channel Enhancement MOSFET: They are normally OFF in actual conditions, but when a small positive voltage is supplied at the gate, unlikely to Depletion MOSFET, it can start to flow the current from the Drain to the Source.
P-channel Enhancement MOSFET: They are also normally OFF, but when a small negative voltage is supplied at the gate, they start to flow the current in a direction from the Source to the Drain. But if a voltage at the Source is greater in value than the voltage at the Drain then they do not need any of the current at the gate.
Uni-Junction Transistors (UJT):
They are the types of transistors which are used as the switches mostly but not as the amplifiers, unlike to other transistor kinds. In this type of a transistor, the main source of the current is the emitter current of the circuit boards.
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