2N4859UB

Product Overview

Category

The 2N4859UB belongs to the category of semiconductor devices, specifically a JFET (Junction Field-Effect Transistor).

Use

This device is commonly used for amplification and switching of electrical signals in various electronic circuits.

Characteristics

• Low noise figure
• High input impedance
• Wide dynamic range
• Good high-frequency performance

Package

The 2N4859UB is typically available in TO-92 packaging, with variations in package type depending on the manufacturer.

Essence

The essence of the 2N4859UB lies in its ability to provide high input impedance and low noise figure, making it suitable for applications requiring signal amplification with minimal distortion.

Packaging/Quantity

The 2N4859UB is usually supplied in reels or tubes, with quantities varying based on the supplier and customer requirements.

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 2N4859UB features three pins: 1. Source (S) 2. Gate (G) 3. Drain (D)

Functional Features

• High input impedance allows for minimal loading of preceding circuitry
• Low noise figure enables clean signal amplification
• Wide dynamic range accommodates varying input signal levels

Advantages and Disadvantages

Advantages

• Low noise figure enhances signal fidelity
• High input impedance minimizes signal degradation
• Wide dynamic range allows for versatile applications

Disadvantages

• Limited maximum drain-source voltage compared to some alternative models
• Moderate continuous drain current rating may restrict certain high-power applications

Working Principles

The 2N4859UB operates based on the field-effect transistor principle, where the control of current between the source and drain terminals is achieved by modulating the voltage applied to the gate terminal.

Detailed Application Field Plans

Audio Amplification

The 2N4859UB can be utilized in audio amplifier circuits due to its low noise figure and high input impedance, which are crucial for maintaining signal integrity and fidelity.

Sensor Interface Circuits

In sensor interface applications, the high input impedance of the 2N4859UB allows for accurate signal acquisition without significantly affecting the sensor output.

Oscillator Circuits

The wide dynamic range of the 2N4859UB makes it suitable for use in oscillator circuits, enabling stable frequency generation across varying input signal amplitudes.

Detailed and Complete Alternative Models

• 2N4858UB
• 2N4859U
• 2N4860UB
• BF256B

These alternative models offer similar functionality and characteristics, providing flexibility in component selection based on specific design requirements.

In conclusion, the 2N4859UB is a versatile JFET semiconductor device with notable advantages in signal amplification and switching applications. Its unique combination of characteristics makes it well-suited for a wide range of electronic circuits, particularly those requiring high input impedance and low noise figure.

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