How Does The 2N5457 N Channel Field Effect Transistor Work?

/ 2018-09-14 / News

2N5457 is an N-channel field effect transistor that's primarily used for audio and switching applications. It consists of a supply, drain, logic gate that are kind of like the emitter, collector, and base of bipolar junction transistors. Unlike the conventional bipolar semiconductor device, it's a voltage-controlled device that doesn't need a polarization current to regulate an outsized current at the other terminals. It begins to conduct once the present flows between the drain and supply terminals. It is referred to as a field effect transistor as a result of the static field plays a crucial role within the transistor's operation.


A JFET is considered fully ON when there is no potential difference between the source and gate terminals. However, if you apply a negative voltage to the barrier, the device will turn off.

This component limits the current flow if there is a potential difference between the source and grid terminals.

A JFET is available in two types, type N and type P channel. 2n5457 is a JFET type N where the voltage at the source terminal is higher than the voltage at the gate terminal.

Current also has a significant effect on the electric field between the drain and the source.

2n5457 is delivered with a high-speed analog circuit and a low error voltage where the drain and source are interchangeable.

2n5457 is made of a semiconductor material that contains negative charge carriers such as electrons.

It has a high insolence of the AC input and a high DC input resistance.

It is delivered in a TO-92 encapsulated plastic case and contains a low transfer and entry capacity.

In JFET, the current flow is managed by limiting the channel through which the current flows.

This JFET is mounted using through-hole technology, which means that it is more resistant to stress but takes up a lot of space compared to the surface mounting technology on which the devices are mounted directly on the surface of the printed circuit board.

What is the constant current diode?

The constant current diode is an electronic device that limits the current to a maximum value specified for the device. It is known as a current limiting diode (CLD), a current regulating diode (CRD).

These diodes consist of an n-channel JFET whose gate is short-circuited to the source, which functions as a two-terminal current limiter or current source (similar to a voltage-limited Zener diode). They allow a current flowing through them to rise to a certain value and then stabilize at a specific value. Unlike Zener diodes, these diodes maintain constant current instead of constant voltage. These devices keep the current flowing through them unchanged when the voltage changes. An example is 1N5312. Note that the negative VGS is required, as an example on the n 2N5457 junction gate field effect transistor.


Manufacturer: Central Semiconductor 

Product Category: JFET 

Mounting Style: Through Hole 

Transistor Polarity: N-Channel 

Configuration: Single 

Vds - Drain-Source Breakdown Voltage: 25 V 

Vgs - Gate-Source Breakdown Voltage: 25 V 

Drain-Source Current at Vgs=0: 1 mA to 5 mA 

Id - Continuous Drain Current: 10 mA 

Pd - Power Dissipation: 310 mW 

Forward Transconductance - Min: 0.001 S to 0.005 S 


• N−Channel for Higher Gain

• Drain and Source Interchangeable

• High AC Input Impedance

• High DC Input Resistance

• Low Transfer and Input Capacitance

• Low Cross−Modulation and Intermodulation Distortion

• Plastic Encapsulated Package

• Pb−Free Packages are Available* 

N−Channel Junction Field Effect Transistors, depletion mode (Type A) designed for audio and switching applications.


2n5457 N Channel Field Effect Transistor mainly consists of three pins. In this N channel device voltage at the gate terminal is used to handle the current that flows from the device. It will conduct when current flows from source and drain terminals.


How does it work?

The field effect process is mainly used to create conductive channels in this JFET.

The flow of electrons in any transistor plays an important role in predicting the conductive nature of the device.


In this N channel, the flow of JFET electrons between the source and the drain is limited by the number of holes available in the grid terminal.

An electric field is generated when we apply a positive voltage to the door terminal. The result is an electron flow from the source to the drain terminal, which helps to turn on the transistor.


The field effect process is used to generate the current, which is why these transistors are called field effect transistors.

2n5457 equivalent: mpf 102, j201

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