ON Semiconductor
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2N3905BU
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2N3905BU

Product Overview

Category:

The 2N3905BU belongs to the category of bipolar junction transistors (BJTs).

Use:

It is commonly used as a general-purpose PNP transistor in various electronic circuits.

Characteristics:

  • Low power, low noise
  • High current gain
  • Suitable for switching and amplification applications

Package:

The 2N3905BU is typically available in a TO-92 package.

Essence:

This transistor is essential for amplifying or switching electronic signals in a wide range of applications.

Packaging/Quantity:

It is usually packaged in reels or tubes containing multiple units, with quantities varying based on manufacturer specifications.

Specifications

  • Collector-Emitter Voltage (VCEO): 40V
  • Collector-Base Voltage (VCBO): 40V
  • Emitter-Base Voltage (VEBO): 5V
  • Collector Current (IC): 200mA
  • Power Dissipation (PD): 625mW
  • DC Current Gain (hFE): 100 - 300

Detailed Pin Configuration

The 2N3905BU transistor has three pins: the emitter, base, and collector. In a TO-92 package, the pinout configuration is as follows: 1. Emitter (E) 2. Base (B) 3. Collector (C)

Functional Features

  • Small form factor
  • Reliable performance
  • Versatile usage in various circuit designs

Advantages and Disadvantages

Advantages

  • Low cost
  • Wide availability
  • Good amplification characteristics

Disadvantages

  • Relatively low power handling capability
  • Limited frequency response compared to other transistors

Working Principles

The 2N3905BU operates based on the principles of bipolar junction transistors, utilizing the flow of charge carriers to amplify or switch electronic signals. When biased correctly, it allows for controlled current flow between its terminals.

Detailed Application Field Plans

The 2N3905BU finds application in a diverse range of electronic circuits, including: - Audio amplifiers - Switching circuits - Signal amplification stages - Oscillator circuits

Detailed and Complete Alternative Models

Some alternative models to the 2N3905BU include: - 2N4403 - BC557 - MPSA92 - 2SA1015

In conclusion, the 2N3905BU is a versatile and widely-used PNP transistor with favorable characteristics for general-purpose electronic applications.

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Énumérez 10 questions et réponses courantes liées à l'application de 2N3905BU dans les solutions techniques

  1. What is the 2N3905BU transistor used for?

    • The 2N3905BU is a general-purpose PNP bipolar junction transistor commonly used in amplification and switching applications.

  2. What are the typical operating conditions for the 2N3905BU?

    • The 2N3905BU typically operates at a maximum collector current of 200mA, with a maximum collector-emitter voltage of 40V.

  3. Can the 2N3905BU be used for audio amplification?

    • Yes, the 2N3905BU can be used for small signal audio amplification due to its low noise and high gain characteristics.

  4. How do I connect the 2N3905BU in a common emitter configuration?

    • In a common emitter configuration, the input signal is applied to the base, the output is taken from the collector, and the emitter is grounded through a resistor.

  5. What are some common alternatives to the 2N3905BU?

    • Common alternatives include the 2N3906 (PNP) and the 2N2222 (NPN) transistors, which have similar characteristics and can be used in similar applications.

  6. What are the thermal considerations when using the 2N3905BU?

    • It's important to consider heat dissipation and use appropriate heat sinks if the transistor is expected to dissipate significant power.

  7. Can the 2N3905BU be used in high-frequency applications?

    • While the 2N3905BU has limitations at higher frequencies due to its transition frequency, it can still be used in moderate frequency applications.

  8. What are the typical gain characteristics of the 2N3905BU?

    • The DC current gain (hFE) of the 2N3905BU typically ranges from 100 to 300, making it suitable for many amplification applications.

  9. Are there any special considerations for driving inductive loads with the 2N3905BU?

    • Yes, it's important to use appropriate flyback diodes or other protection methods when driving inductive loads to prevent damage to the transistor.

  10. Can the 2N3905BU be used in low-power switching applications?

    • Yes, the 2N3905BU can be used in low-power switching applications such as relay drivers and LED drivers, provided that the operating conditions are within its specified limits.