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2N3821
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2N3821 Transistor

Product Overview

Category

The 2N3821 is a bipolar junction transistor (BJT) belonging to the NPN type.

Use

It is commonly used for amplification and switching applications in electronic circuits.

Characteristics

  • High current gain
  • Low noise
  • Medium power dissipation

Package

The 2N3821 is typically available in a TO-39 metal can package.

Essence

This transistor is essential for signal amplification and switching in various electronic devices and circuits.

Packaging/Quantity

The 2N3821 is usually packaged in reels or tubes, with quantities varying based on supplier and customer requirements.

Specifications

  • Collector-Base Voltage (VCBO): 40V
  • Collector-Emitter Voltage (VCEO): 20V
  • Emitter-Base Voltage (VEBO): 5V
  • Collector Current (IC): 0.2A
  • Power Dissipation (Pd): 0.36W
  • Transition Frequency (ft): 100MHz
  • Operating Temperature: -65°C to 200°C

Detailed Pin Configuration

The 2N3821 transistor has three pins: 1. Collector (C) 2. Base (B) 3. Emitter (E)

Functional Features

  • High current gain allows for efficient signal amplification.
  • Low noise makes it suitable for use in audio applications.
  • Medium power dissipation enables it to handle moderate power levels.

Advantages

  • Versatile application in amplification and switching circuits.
  • Low noise characteristics make it suitable for audio applications.
  • Compact TO-39 package for easy integration into circuit designs.

Disadvantages

  • Limited power dissipation compared to higher-power transistors.
  • Moderate collector current limits its use in high-power applications.

Working Principles

The 2N3821 operates as a current-controlled switch or amplifier. When a small current flows into the base terminal, it controls a larger current flow between the collector and emitter terminals, allowing for signal amplification or switching.

Detailed Application Field Plans

The 2N3821 is widely used in the following applications: - Audio amplifiers - Signal amplification in communication systems - Switching circuits in electronic control systems

Detailed and Complete Alternative Models

Some alternative models to the 2N3821 include: - 2N2222: Similar NPN BJT with lower power dissipation - BC547: General-purpose NPN transistor with comparable characteristics - 2N3904: NPN BJT with similar voltage and current ratings

In conclusion, the 2N3821 transistor is a versatile component with applications in amplification and switching circuits across various electronic devices and systems.

Word Count: 410

技術ソリューションにおける 2N3821 の適用に関連する 10 件の一般的な質問と回答をリストします。

  1. What is the 2N3821 transistor used for?

    • The 2N3821 transistor is commonly used for high-speed switching and amplification in electronic circuits.

  2. What are the key specifications of the 2N3821 transistor?

    • The 2N3821 is a PNP silicon transistor with a maximum collector current of 3A, a maximum collector-base voltage of 60V, and a maximum power dissipation of 30W.

  3. How can I use the 2N3821 transistor as a switch?

    • To use the 2N3821 as a switch, you can connect the base of the transistor to a control signal and use the collector-emitter path to control a load, such as a motor or a relay.

  4. Can the 2N3821 be used in audio amplifier circuits?

    • Yes, the 2N3821 can be used in audio amplifier circuits, particularly in low-power applications where its high-speed switching capabilities are beneficial.

  5. What are some common applications of the 2N3821 in technical solutions?

    • The 2N3821 is often used in pulse circuits, high-speed switching circuits, and general-purpose amplification in various technical solutions.

  6. What are the typical operating conditions for the 2N3821 transistor?

    • The 2N3821 operates well within a temperature range of -65°C to 200°C and is suitable for a wide range of voltage and current requirements.

  7. How do I ensure proper heat dissipation when using the 2N3821 in my circuit?

    • Proper heat sinking and thermal management techniques should be employed to ensure that the 2N3821 operates within its specified temperature limits.

  8. Are there any common pitfalls to avoid when using the 2N3821 in technical solutions?

    • It's important to avoid exceeding the maximum ratings for voltage, current, and power dissipation to prevent damage to the transistor.

  9. Can the 2N3821 be used in high-frequency applications?

    • While the 2N3821 has good high-frequency characteristics, it's important to consider its limitations and performance at specific frequencies in high-frequency applications.

  10. Where can I find detailed application notes and reference designs for the 2N3821?

    • Detailed application notes and reference designs for the 2N3821 can often be found in semiconductor manufacturer datasheets, application guides, and technical resources.