Part No. 2SK170-BL
Introduction:
The field-effect transistor (FET) is generally a type of transistor that mostly uses an electric field to control or to drive the flow of current in a semiconductor device. FETs are generally devices with three terminals: source, gate, and drain. FETs always control the flow of current by the application of a voltage to the gate at present , which in turn alters or changes the conductivity in between the drain and source terminals.
FETs are also known as or considered as unipolar transistors since they involve single-carrier-type operation. That is, FETs use either electrons or holes as charge carriers means one at a single time in their operation, but not both.
Features:
- Input and output phase relation of almost 180 degrees
- Power gain is high in nature
- Resistance input is medium
- Output and input resistance is medium
Working:
FET is a voltage-controlled device that is controlled by use of a reverse or opposite bias voltage to the gate terminal of the transistor. The channel gets drained, and the electric current becomes switched off in that condition. A Field Effect Transistor is normally said to be on when there is no voltage between the gate and the source pin Junction of the Field Effect Transistor (FET). Field effect transistor is usually two types as it is used n-type or p-type channel as per working condition of both the available types. In the n-type, when the voltage source is present and connected to the gate is -ve with respect to the source, then the current decreases. Correspondingly, when a FET have a p-type channel, if a positive voltage is applied or present to the gate with respect to the source the current becomes reduced or decreases.
Applications:
- In phase shift oscillators
- Used in choppers
- In analog switches
- Used in current limiters
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