Central Semiconductor Corp
Gambar mungkin merupakan representasi.
Lihat spesifikasi untuk detail produk.
2N3903
Lihat Detail Lembar Data

2N3903 Transistor

Product Overview

The 2N3903 is a general-purpose NPN bipolar junction transistor (BJT) commonly used in electronic circuits for amplification and switching purposes. It falls under the category of small-signal transistors and is widely utilized in various applications due to its versatile characteristics.

Basic Information Overview

  • Category: Small-signal NPN BJT
  • Use: Amplification and switching in electronic circuits
  • Characteristics: Low power, high voltage, moderate current capability
  • Package: TO-92 package
  • Essence: General-purpose transistor for low-power applications
  • Packaging/Quantity: Typically available in reels or tubes containing multiple units

Specifications

  • Maximum Power Dissipation: 350 mW
  • Collector-Base Voltage (VCBO): 40 V
  • Collector-Emitter Voltage (VCEO): 40 V
  • Emitter-Base Voltage (VEBO): 5 V
  • Collector Current (IC): 200 mA
  • DC Current Gain (hFE): 100 - 300
  • Transition Frequency (fT): 250 MHz

Detailed Pin Configuration

The 2N3903 transistor has three pins: 1. Emitter (E): Connected to the N-type material and is the source of electrons. 2. Base (B): Controls the flow of electrons from the emitter to the collector. 3. Collector (C): Collects the majority charge carriers that cross the base.

Functional Features

  • Amplification: The 2N3903 can amplify small signals with high input impedance and moderate output impedance.
  • Switching: It can be used to switch electronic circuits on and off with low power dissipation.

Advantages and Disadvantages

Advantages

  • Low cost and readily available
  • Versatile for various low-power applications
  • Suitable for small-signal amplification

Disadvantages

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

Working Principles

The 2N3903 operates based on the principles of bipolar junction transistors, where the flow of current between the emitter and collector is controlled by the base current. In amplification mode, small changes in the base current result in larger changes in the collector current, enabling signal amplification.

Detailed Application Field Plans

The 2N3903 finds extensive use in the following applications: - Audio amplifiers - Signal processing circuits - Switching circuits - Oscillators - Voltage regulators

Detailed and Complete Alternative Models

  • 2N2222: Similar NPN transistor with higher current and power handling capabilities.
  • BC547: Another NPN transistor suitable for general-purpose amplification and switching.

In conclusion, the 2N3903 transistor serves as a fundamental component in electronic circuits, offering amplification and switching capabilities for various low-power applications.

[Word count: 411]

Sebutkan 10 pertanyaan dan jawaban umum terkait penerapan 2N3903 dalam solusi teknis

  1. What is the 2N3903 transistor used for?

    • The 2N3903 is a general-purpose NPN bipolar junction transistor commonly used for amplification and switching applications in electronic circuits.

  2. What are the typical operating conditions for the 2N3903?

    • The 2N3903 typically operates at a maximum collector current of 200mA, with a maximum collector-emitter voltage of 40V.

  3. How do I identify the pinout of the 2N3903 transistor?

    • The pinout of the 2N3903 transistor is typically Emitter (E), Base (B), and Collector (C) when viewing the flat side with the leads pointing downward.

  4. Can the 2N3903 be used for audio amplification?

    • Yes, the 2N3903 can be used for small-signal audio amplification in low-power applications.

  5. What are some common circuit configurations using the 2N3903?

    • Common circuit configurations include common emitter amplifiers, switch circuits, and signal amplification stages in electronic projects.

  6. What are the typical gain characteristics of the 2N3903?

    • The 2N3903 has a typical DC current gain (hFE) ranging from 100 to 300, making it suitable for various amplification tasks.

  7. Are there any specific considerations for driving inductive loads with the 2N3903?

    • When driving inductive loads, such as relays or small motors, it's important to use appropriate flyback diodes to protect the transistor from voltage spikes.

  8. Can the 2N3903 be used in high-frequency applications?

    • While the 2N3903 can function at moderate frequencies, it may not be suitable for high-frequency applications due to its transition frequency and capacitance characteristics.

  9. What are the common failure modes of the 2N3903?

    • Common failure modes include thermal runaway under excessive current or voltage stress, as well as damage from static discharge during handling.

  10. Are there any recommended heat dissipation measures when using the 2N3903 in high-current applications?

    • To prevent overheating, it's advisable to use a heatsink when operating the 2N3903 near its maximum current rating, and to ensure proper ventilation in the circuit enclosure.