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2N5551BU
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2N5551BU - Transistor Encyclopedia Entry

Introduction

The 2N5551BU is a versatile NPN bipolar junction transistor (BJT) that belongs to the category of electronic components. This entry provides an overview of the 2N5551BU, including its basic information, specifications, pin configuration, functional features, advantages and disadvantages, working principles, application field plans, and alternative models.

Basic Information Overview

  • Category: Electronic Components
  • Use: Amplification, Switching
  • Characteristics: High voltage, Low current, Medium power
  • Package: TO-92
  • Essence: NPN BJT
  • Packaging/Quantity: Bulk or Tape & Reel

Specifications

  • Collector-Emitter Voltage (VCEO): 160V
  • Collector-Base Voltage (VCBO): 180V
  • Emitter-Base Voltage (VEBO): 6V
  • Collector Current (IC): 600mA
  • Power Dissipation (Pd): 625mW
  • Transition Frequency (ft): 150MHz
  • Operating Temperature Range: -55°C to 150°C

Detailed Pin Configuration

The 2N5551BU transistor has three pins: 1. Collector (C): Connects to the positive supply in the circuit. 2. Base (B): Controls the transistor's conductivity when a small current is applied. 3. Emitter (E): Connects to the ground in the circuit.

Functional Features

  • High voltage capability
  • Low leakage current
  • Fast switching speed
  • Suitable for audio amplification and general purpose applications

Advantages and Disadvantages

Advantages

  • Versatile use in amplification and switching circuits
  • High voltage tolerance
  • Compact TO-92 package
  • Low cost

Disadvantages

  • Limited current handling capacity compared to power transistors
  • Sensitive to temperature variations

Working Principles

The 2N5551BU operates based on the principles of bipolar junction transistors. When a small current is applied to the base terminal, it controls the larger current flow between the collector and emitter terminals. This property enables the transistor to amplify signals or act as a switch in electronic circuits.

Detailed Application Field Plans

The 2N5551BU finds extensive use in various electronic applications, including: - Audio amplifiers - Signal amplification circuits - Switching circuits - Oscillator circuits - Voltage regulators

Detailed and Complete Alternative Models

Some alternative models to the 2N5551BU include: - BC547 - 2N3904 - 2N4401 - PN2222A - BC337

In summary, the 2N5551BU is a widely used NPN transistor with high voltage capabilities, making it suitable for amplification and switching applications across diverse electronic circuits.

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  1. What is the 2N5551BU transistor used for?

    • The 2N5551BU is a general-purpose PNP bipolar junction transistor commonly used in amplification and switching applications.

  2. What are the typical operating conditions for the 2N5551BU?

    • The 2N5551BU operates under a maximum collector-emitter voltage of 160V, a collector current of 600mA, and a power dissipation of 625mW.

  3. How do I identify the pinout of the 2N5551BU transistor?

    • The pinout of the 2N5551BU is typically Emitter (E), Base (B), and Collector (C) when viewing the flat side with the leads pointing downward.

  4. Can the 2N5551BU be used for audio amplifier circuits?

    • Yes, the 2N5551BU can be used in low-power audio amplifier circuits due to its moderate voltage and current ratings.

  5. What are some common alternatives to the 2N5551BU transistor?

    • Common alternatives include the BC557, BC558, and 2N3906 transistors, which have similar characteristics and can be used as substitutes in many applications.

  6. Is the 2N5551BU suitable for high-frequency applications?

    • The 2N5551BU is not typically recommended for high-frequency applications due to its moderate transition frequency and capacitance characteristics.

  7. What are the typical gain and frequency response of the 2N5551BU?

    • The DC current gain (hFE) of the 2N5551BU ranges from 120 to 300, and the transition frequency (fT) is around 150MHz.

  8. Can the 2N5551BU be used in a Darlington pair configuration?

    • Yes, the 2N5551BU can be used in a Darlington pair to achieve higher current gain and lower saturation voltage in certain applications.

  9. Are there any specific thermal considerations for the 2N5551BU?

    • It is important to consider proper heat sinking for the 2N5551BU, especially when operating at higher currents or power levels, to ensure reliable performance and longevity.

  10. What are some common application circuits for the 2N5551BU?

    • Common application circuits include small signal amplifiers, switching circuits, LED drivers, and voltage regulators, among others.