Central Semiconductor Corp
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2N4859A
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2N4859A

Product Overview

Category:

The 2N4859A is a small-signal N-channel JFET (Junction Field-Effect Transistor) used in electronic circuits.

Use:

It is commonly used as an amplifier, switch, or voltage-controlled resistor in various electronic applications.

Characteristics:

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

Package:

The 2N4859A is typically available in TO-92 packaging.

Essence:

This JFET is essential for low-noise, high-impedance signal processing in electronic circuits.

Packaging/Quantity:

It is usually supplied in reels or tubes, with quantities varying based on manufacturer specifications.

Specifications

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

Detailed Pin Configuration

The 2N4859A has three pins: 1. Source (S) 2. Gate (G) 3. Drain (D)

Functional Features

The 2N4859A offers the following functional features: - High input impedance allows for minimal loading of preceding stages. - Low noise figure makes it suitable for low-level amplification of weak signals. - Wide dynamic range enables versatile use in different circuit configurations.

Advantages and Disadvantages

Advantages

  • Low noise figure
  • High input impedance
  • Versatile functionality

Disadvantages

  • Limited maximum drain-source voltage
  • Moderate continuous drain current rating

Working Principles

The 2N4859A operates based on the principles of field-effect transistors, where the flow of current between the source and drain terminals is controlled by the voltage applied to the gate terminal.

Detailed Application Field Plans

The 2N4859A finds application in various fields, including: - Audio amplification - Instrumentation - Radio frequency (RF) circuits - Sensor interfaces

Detailed and Complete Alternative Models

Some alternative models to the 2N4859A include: - J112 - 2N5457 - BF245

In conclusion, the 2N4859A is a versatile N-channel JFET with excellent low-noise and high-impedance characteristics, making it suitable for a wide range of electronic applications.

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Sebutkan 10 pertanyaan dan jawaban umum terkait penerapan 2N4859A dalam solusi teknis

  1. What is the 2N4859A transistor used for?

    • The 2N4859A is a JFET (junction field-effect transistor) commonly used for low-noise amplification and high input impedance applications.

  2. What are the key features of the 2N4859A transistor?

    • The 2N4859A offers low noise, high gain, and high input impedance, making it suitable for use in audio amplifiers, instrumentation, and sensor interfaces.

  3. What is the pin configuration of the 2N4859A transistor?

    • The 2N4859A has three pins: gate (G), source (S), and drain (D).

  4. What are the typical operating conditions for the 2N4859A transistor?

    • The 2N4859A operates at low to moderate frequencies with a maximum voltage rating of around 30V and a maximum current rating of approximately 10mA.

  5. How can the 2N4859A be used in amplifier circuits?

    • The 2N4859A can be used as a preamplifier in audio circuits or as a signal amplifier in instrumentation and measurement systems due to its low noise and high gain characteristics.

  6. What are some common applications of the 2N4859A in technical solutions?

    • The 2N4859A is commonly used in microphone preamplifiers, low-noise audio amplifiers, sensor interfaces, and low-frequency signal processing circuits.

  7. What are the typical performance specifications of the 2N4859A?

    • Typical performance specifications include a low noise figure (NF), high transconductance (gm), and high input impedance (Zin).

  8. What are the recommended biasing and operating conditions for the 2N4859A?

    • The 2N4859A is typically biased in the common-source configuration with appropriate DC biasing to ensure proper operation and linearity.

  9. Can the 2N4859A be used in high-temperature environments?

    • The 2N4859A has a maximum junction temperature of around 150°C, making it suitable for use in many industrial and commercial applications.

  10. Are there any alternative components that can be used in place of the 2N4859A?

    • Alternative JFETs with similar characteristics, such as the 2N5457 or the BF862, can be used as substitutes for the 2N4859A in certain applications, but careful consideration of their specifications is necessary.