ON Semiconductor
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BD439
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BD439 Transistor

Product Overview

Category

BD439 belongs to the category of bipolar junction transistors (BJTs).

Use

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

Characteristics

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

Package

The BD439 transistor is typically available in a TO-126 package.

Essence

The essence of BD439 lies in its ability to amplify and switch electronic signals in various applications.

Packaging/Quantity

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

Specifications

  • Collector-Emitter Voltage: 80V
  • Collector Current: 1.5A
  • Power Dissipation: 12.5W
  • Transition Frequency: 30MHz
  • Gain Bandwidth Product: 40MHz

Detailed Pin Configuration

The BD439 transistor has three pins: 1. Emitter (E) 2. Base (B) 3. Collector (C)

Functional Features

  • High current gain
  • Low saturation voltage
  • Fast switching speed

Advantages

  • Suitable for low-power applications
  • Reliable performance
  • Wide operating temperature range

Disadvantages

  • Limited voltage and current ratings compared to other transistors
  • Sensitive to temperature variations

Working Principles

The BD439 operates based on the principles of amplification and control of electrical currents. When a small current flows into the base terminal, it controls a larger current flow between the collector and emitter terminals.

Detailed Application Field Plans

BD439 transistors find applications in various electronic circuits, including: - Audio amplifiers - Switching circuits - Voltage regulators - Oscillators

Detailed and Complete Alternative Models

Some alternative models to BD439 include: - BD437 - BD438 - BD440 - 2N3906 - 2N4403

In conclusion, the BD439 transistor is a versatile component with a wide range of applications in electronic circuits. Its characteristics make it suitable for low-power amplification and switching tasks, although it may have limitations in high-power applications. Understanding its specifications and functional features is essential for effectively integrating it into electronic designs.

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Seznam 10 běžných otázek a odpovědí souvisejících s aplikací BD439 v technických řešeních

  1. What is BD439?

    • BD439 is a PNP silicon epitaxial-base transistor commonly used in audio amplification and switching applications.

  2. What are the typical applications of BD439?

    • BD439 is often used in audio amplifier circuits, voltage regulator circuits, and general purpose switching applications.

  3. What are the key electrical characteristics of BD439?

    • The key electrical characteristics of BD439 include a collector-emitter voltage (VCEO) of 80V, a collector current (IC) of 4A, and a power dissipation (PD) of 36W.

  4. How is BD439 typically used in audio amplifier circuits?

    • In audio amplifier circuits, BD439 is commonly used as a driver or output transistor to amplify audio signals with low distortion.

  5. Can BD439 be used in voltage regulator circuits?

    • Yes, BD439 can be used in voltage regulator circuits to provide stable output voltage regulation when combined with appropriate circuitry.

  6. What are the recommended operating conditions for BD439?

    • The recommended operating conditions for BD439 include a maximum collector current (IC) of 4A, a maximum collector-emitter voltage (VCEO) of 80V, and a maximum power dissipation (PD) of 36W.

  7. Are there any specific considerations for heat dissipation when using BD439?

    • Yes, proper heat sinking is important when using BD439, especially in high-power applications, to ensure that the transistor operates within its safe temperature limits.

  8. What are the typical package types available for BD439?

    • BD439 is commonly available in TO-126 and TO-220 package types, which offer different mounting and heat dissipation capabilities.

  9. Can BD439 be used in high-frequency switching applications?

    • While BD439 can be used in switching applications, it may not be suitable for very high-frequency switching due to its transition frequency limitations.

  10. Where can I find detailed application notes and datasheets for BD439?

    • Detailed application notes and datasheets for BD439 can be found on semiconductor manufacturer websites or distributor platforms, providing comprehensive information on its usage and characteristics.