Microsemi Corporation
La imagen puede ser una representación.
Consulte las especificaciones para obtener detalles del producto.
2N4905

2N4905 Transistor

Product Overview

The 2N4905 is a bipolar junction NPN transistor commonly used in electronic circuits. It falls under the category of discrete semiconductor devices and is widely utilized for amplification and switching applications. The transistor exhibits characteristics such as high current gain, low noise, and fast switching speed. It is typically available in a TO-92 package and is sold individually or in bulk quantities.

Specifications

  • Type: NPN Bipolar Junction Transistor
  • Maximum Collector-Emitter Voltage (VCEO): 40V
  • Maximum Collector-Base Voltage (VCBO): 60V
  • Maximum Emitter-Base Voltage (VEBO): 6V
  • Collector Current (IC): 200mA
  • Power Dissipation (PD): 625mW
  • Transition Frequency (ft): 150MHz
  • Operating Temperature Range: -55°C to 150°C

Detailed Pin Configuration

The 2N4905 transistor has three pins: the emitter (E), base (B), and collector (C). In a TO-92 package, the pin configuration is as follows: - Emitter (E) - Pin 1 - Base (B) - Pin 2 - Collector (C) - Pin 3

Functional Features

The 2N4905 transistor offers the following functional features: - High current gain for amplification purposes - Fast switching speed for use in switching applications - Low noise characteristics suitable for signal processing

Advantages and Disadvantages

Advantages

  • High current gain allows for efficient signal amplification
  • Fast switching speed enables rapid on/off transitions in electronic circuits
  • Low noise characteristics make it suitable for signal processing applications

Disadvantages

  • Limited maximum collector current compared to other power transistors
  • Relatively low breakdown voltage limits its use in high-voltage applications

Working Principles

The 2N4905 operates based on the principles of bipolar junction transistors. When a small current flows into the base terminal, it controls a larger current flowing between the collector and emitter terminals. This property allows the transistor to amplify signals or act as a switch in electronic circuits.

Detailed Application Field Plans

The 2N4905 transistor finds extensive use in various electronic applications, including but not limited to: - Audio amplifiers - Signal processing circuits - Switching circuits - Oscillator circuits - Voltage regulators

Detailed and Complete Alternative Models

Some alternative models to the 2N4905 transistor include: - BC547 - 2N2222 - 2N3904 - PN2222A - BC548

In conclusion, the 2N4905 transistor is a versatile component with applications in amplification and switching circuits across various electronic devices and systems.

[Word Count: 387]

Enumere 10 preguntas y respuestas comunes relacionadas con la aplicación de 2N4905 en soluciones técnicas

  1. What is the 2N4905 transistor used for?

    • The 2N4905 is a PNP bipolar junction transistor commonly used for amplification and switching applications in electronic circuits.

  2. What are the typical operating conditions for the 2N4905 transistor?

    • The 2N4905 transistor typically operates with a collector-emitter voltage (Vce) of around 40V, a collector current (Ic) of 200mA, and a power dissipation (Pd) of 625mW.

  3. How do I identify the pin configuration of the 2N4905 transistor?

    • The pinout of the 2N4905 transistor is typically Emitter (E), Base (B), and Collector (C) when viewing the flat side with the leads pointing downward.

  4. What are some common circuit configurations using the 2N4905 transistor?

    • Common circuit configurations include common emitter amplifiers, switch-mode power supplies, and signal amplification in audio applications.

  5. What are the key characteristics of the 2N4905 transistor?

    • The 2N4905 transistor has high current gain, low saturation voltage, and moderate frequency response, making it suitable for various amplification and switching tasks.

  6. How do I calculate the base current and resistor values for driving the 2N4905 transistor?

    • The base current can be calculated using the desired collector current and the current gain (hfe) of the transistor. The base resistor value can then be determined using Ohm's law.

  7. What are the typical applications of the 2N4905 transistor in technical solutions?

    • The 2N4905 transistor is commonly used in audio amplifiers, voltage regulators, motor control circuits, and general purpose switching applications.

  8. What are the thermal considerations when using the 2N4905 transistor?

    • Proper heat sinking and thermal management should be considered to ensure the 2N4905 operates within its specified temperature range to avoid thermal runaway and premature failure.

  9. Can the 2N4905 transistor be used in high-frequency applications?

    • While the 2N4905 has moderate frequency response, it may not be suitable for very high-frequency applications due to its transition frequency and capacitance characteristics.

  10. Are there any common pitfalls or issues to watch out for when using the 2N4905 transistor?

    • Care should be taken to avoid exceeding the maximum ratings for voltage, current, and power dissipation to prevent damage to the transistor. Additionally, proper biasing and stability considerations should be addressed in amplifier designs.