Microsemi Corporation
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2N4903

2N4903 Transistor

Product Overview

Category

The 2N4903 is a general-purpose PNP bipolar junction transistor (BJT).

Use

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

Characteristics

  • Low power dissipation
  • High current gain
  • Medium voltage capability

Package

The 2N4903 is typically available in a TO-92 package.

Essence

This transistor is essential for designing and building various electronic devices and circuits.

Packaging/Quantity

It is usually sold in reels or tubes containing multiple units.

Specifications

  • Collector-Emitter Voltage: -40V
  • Collector-Base Voltage: -60V
  • Emitter-Base Voltage: -5V
  • Collector Current: -200mA
  • Power Dissipation: 625mW
  • Transition Frequency: 100MHz
  • Operating Temperature: -55°C to 150°C

Detailed Pin Configuration

  1. Emitter (E)
  2. Base (B)
  3. Collector (C)

Functional Features

  • High current gain allows for small base current to control large collector current.
  • Low power dissipation makes it suitable for low-power applications.
  • Medium voltage capability enables use in a wide range of circuit designs.

Advantages

  • Versatile and widely used in various electronic applications.
  • Small form factor and easy to integrate into circuit designs.

Disadvantages

  • Limited power handling capabilities compared to other high-power transistors.
  • Sensitive to temperature variations.

Working Principles

The 2N4903 operates based on the principles of current amplification and control. When a small current flows into the base terminal, it controls a larger current flowing between the collector and emitter terminals, allowing for signal amplification and switching.

Detailed Application Field Plans

The 2N4903 is commonly used in: - Audio amplifiers - Signal amplification circuits - Switching circuits - Oscillator circuits

Detailed and Complete Alternative Models

  • 2N4403
  • BC557
  • BC327
  • 2N3906

In conclusion, the 2N4903 transistor is a versatile component with a wide range of applications in electronic circuits. Its compact size, high current gain, and medium voltage capability make it an essential part of many electronic designs.

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Seznam 10 běžných otázek a odpovědí souvisejících s aplikací 2N4903 v technických řešeních

Sure, here are 10 common questions and answers related to the application of 2N4903 in technical solutions:

  1. What is the 2N4903 transistor used for?

    • The 2N4903 is a general-purpose PNP bipolar junction transistor (BJT) commonly used for amplification and switching applications.

  2. What are the key specifications of the 2N4903 transistor?

    • The 2N4903 has a maximum collector current (Ic) of 600mA, a maximum collector-base voltage (Vcb) of 60V, and a maximum emitter-base voltage (Veb) of 5V.

  3. How can the 2N4903 be used as a switch?

    • The 2N4903 can be used as a switch by biasing it into either cutoff or saturation regions. In cutoff, it acts as an open switch, and in saturation, it acts as a closed switch.

  4. What are some typical amplifier circuits using the 2N4903?

    • Common amplifier configurations using the 2N4903 include common-emitter and common-collector configurations for both audio and small signal amplification.

  5. What are the thermal considerations when using the 2N4903 in a circuit?

    • It's important to consider the power dissipation of the 2N4903 and ensure proper heat sinking to prevent overheating and potential damage to the transistor.

  6. Can the 2N4903 be used in high-frequency applications?

    • While the 2N4903 can be used in moderate frequency applications, it may not be suitable for high-frequency designs due to its transition frequency and capacitance characteristics.

  7. What are the typical operating conditions for the 2N4903?

    • The 2N4903 is typically operated within a temperature range of -55°C to 150°C and in low to moderate current and voltage conditions.

  8. How does the 2N4903 compare to similar transistors like the 2N3906?

    • The 2N4903 is a PNP transistor, while the 2N3906 is an NPN transistor. They have opposite polarities and different voltage and current ratings.

  9. Can the 2N4903 be used in audio amplifier applications?

    • Yes, the 2N4903 can be used in audio amplifier circuits, particularly in low-power and small-signal audio amplification.

  10. Are there any common failure modes or reliability concerns with the 2N4903?

    • Common failure modes include thermal runaway under high current conditions and breakdown due to excessive voltage stress. Proper design and operating conditions can mitigate these concerns.

I hope this information helps! Let me know if you need further details on any specific question.