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JFET
Sign in to saveAlso known as junction field-effect transistor
The junction field-effect transistor (JFET) is one of the simplest types of field-effect transistor. JFETs are three-terminal semiconductor devices that can be used as electronically controlled switches or resistors, or to build amplifiers.
Key facts
- Electronic component.name
- JFET
- Electronic component.image
- JFET cross section.svg
- Electronic component.image_size
- 270px
- Electronic component.caption
- Electric current from source to drain in a p-channel JFET is restricted when a voltage is applied to the gate.
- Electronic component.type
- Active
- Electronic component.symbol
- 100px 100px
- Electronic component.pins
- drain, gate, source
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Article
12 sectionsContents
- History
- Structure
- Functions
- Schematic symbols
- Comparison with other transistors
- Mathematical model
- Linear ohmic region
- Constant-current region
- Transconductance
- See also
- References
- External links
The junction field-effect transistor (JFET) is one of the simplest types of field-effect transistor. JFETs are three-terminal semiconductor devices that can be used as electronically controlled switches or resistors, or to build amplifiers.
Unlike bipolar junction transistors, JFETs are exclusively voltage-controlled in that they do not need a biasing current. Electric charge flows through a semiconducting channel between source and drain terminals. By applying a reverse bias voltage to a gate terminal, the channel is pinched, so that the electric current is impeded or switched off completely. A JFET is usually conducting when there is zero voltage between its gate and source terminals. If a potential difference of the proper polarity is applied between its gate and source terminals, the JFET will be more resistive to current flow, which means less current would flow in the channel between the source and drain terminals.