Field-Effect Transistor (FET) Structure and Operating Principle
A field-effect transistor (FET) is an electronic device used in electronics to control electric current. It is one of the main types of transistors, along with bipolar transistors.
The primary difference between a field-effect transistor and a bipolar transistor lies in the method of current control: in a field-effect transistor, the current is controlled by an electric field rather than by current flow. A field-effect transistor contains a conductive channel through which the main current flows, and a control electrode, called the gate, which regulates the conductivity of this channel.
There are two main types of field-effect transistors: MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) and JFET (Junction Field-Effect Transistor).
A MOSFET uses a structure made of metal, oxide, and semiconductor, where the gate is formed by a metallic layer separated from the semiconductor channel by a thin oxide layer. MOSFETs are the most common type of field-effect transistor and are used in many electronic devices, including microprocessors, memory chips, and amplifiers.
A JFET features a PN-junction between the gate and the channel, with its conductivity controlled by the gate voltage. JFETs are typically used in applications requiring high input impedance and low noise.
Field-effect transistors offer several advantages, including high input impedance, low power consumption, high operating speed, and compact size. They are widely used in various electronic devices such as computers, mobile phones, televisions, radios, and others.
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Imported analogues of domestic transistors
Transistor 2T818A, 2T818B, 2T818V, 2T818A2, 2T818B2, 2T818V2, KT818A, KT818B, KT818V, KT818G, KT818AM, KT818BM, KT818VM, KT818GM, KT818A1, KT818B1, KT818V1, K7818G1 specifications and datasheet