2N4857UB

Product Overview

Use

It is commonly used in audio amplifiers, instrumentation amplifiers, and high-impedance amplifiers due to its low noise and high input impedance characteristics.

Characteristics

Low noise figure
High input impedance
Wide dynamic range
High gain

Package

The 2N4857UB is typically available in TO-92 packaging with a quantity of 100 pieces per pack.

Specifications

Maximum Drain-Source Voltage: 40V
Maximum Gate-Source Voltage: 40V
Continuous Drain Current: 10mA
Power Dissipation: 350mW
Operating Temperature Range: -55°C to 150°C

Detailed Pin Configuration

The 2N4857UB has three pins: 1. Source (S) 2. Gate (G) 3. Drain (D)

Functional Features

Low noise performance
High input impedance
Suitable for low-power applications

Advantages and Disadvantages

Advantages

Low noise figure
High input impedance
Wide dynamic range
High gain

Disadvantages

Limited maximum drain-source voltage
Limited continuous drain current

Working Principles

The 2N4857UB operates based on the principle of controlling the flow of current between the source and drain terminals using an electric field applied across the gate terminal. This allows for amplification of small signals with minimal distortion.

Detailed Application Field Plans

The 2N4857UB is widely used in the following applications: - Audio amplifiers - Instrumentation amplifiers - High-impedance amplifiers - Low-power signal amplification circuits

Detailed and Complete Alternative Models

Some alternative models to the 2N4857UB include: - J112 - J175 - 2N5458 - 2N5485

In conclusion, the 2N4857UB is a versatile small-signal N-channel JFET with excellent noise performance and high input impedance, making it suitable for various low-power amplifier applications.

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Liste 10 almindelige spørgsmål og svar relateret til anvendelsen af 2N4857UB i tekniske løsninger

What is the 2N4857UB transistor used for?
- The 2N4857UB is a general-purpose N-channel JFET transistor commonly used for low-power amplification and switching applications.
What are the key features of the 2N4857UB transistor?
- The 2N4857UB features low noise, high input impedance, and low leakage current, making it suitable for high-impedance pre-amplifier and mixer applications.
What is the maximum drain-source voltage for the 2N4857UB?
- The maximum drain-source voltage for the 2N4857UB is typically around 30 volts.
What is the typical gain of the 2N4857UB transistor?
- The typical gain of the 2N4857UB transistor ranges from 20 to 100, depending on the operating conditions.
Can the 2N4857UB be used in audio amplifier circuits?
- Yes, the 2N4857UB can be used in audio amplifier circuits due to its low noise and high input impedance characteristics.
What are the recommended operating conditions for the 2N4857UB?
- The 2N4857UB operates well within a temperature range of -55°C to 150°C and is typically used with a maximum drain current of 10mA.
Is the 2N4857UB suitable for low-frequency signal processing?
- Yes, the 2N4857UB is suitable for low-frequency signal processing due to its low noise and high input impedance.
Can the 2N4857UB be used in voltage-controlled resistor applications?
- Yes, the 2N4857UB can be used in voltage-controlled resistor applications due to its ability to modulate resistance based on gate-source voltage.
What are some common circuit configurations using the 2N4857UB?
- Common circuit configurations include common source amplifiers, voltage-controlled resistors, and low-noise pre-amplifiers.
Where can I find detailed specifications and application notes for the 2N4857UB?
- Detailed specifications and application notes for the 2N4857UB can be found in the manufacturer's datasheet and application notes, as well as in technical reference manuals for JFET transistors.