Central Semiconductor Corp
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2N687
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2N687 Transistor

Product Overview

The 2N687 is a bipolar junction transistor (BJT) belonging to the category of small-signal transistors. It is commonly used for amplification and switching applications in electronic circuits. The transistor exhibits characteristics such as high gain, low noise, and fast switching speed. It is typically packaged in a TO-92 package and is available in both through-hole and surface mount versions. The essence of the 2N687 lies in its ability to amplify weak signals and control the flow of current in electronic devices. Each package contains one 2N687 transistor.

Specifications

  • Maximum Collector-Emitter Voltage: 40V
  • Maximum Collector Current: 200mA
  • DC Current Gain (hfe): 100 - 300
  • Power Dissipation: 625mW
  • Transition Frequency: 150MHz
  • Operating Temperature Range: -55°C to 150°C

Detailed Pin Configuration

The 2N687 transistor has three pins: 1. Base (B) 2. Emitter (E) 3. Collector (C)

Functional Features

The 2N687 transistor offers high voltage and current ratings, making it suitable for various amplification and switching applications. Its low noise and high gain characteristics make it ideal for use in audio amplifiers and signal processing circuits.

Advantages and Disadvantages

Advantages

  • High gain
  • Low noise
  • Fast switching speed
  • Wide operating temperature range

Disadvantages

  • Limited maximum collector current
  • Relatively low power dissipation rating

Working Principles

The 2N687 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 allows the transistor to amplify signals or act as a switch in electronic circuits.

Detailed Application Field Plans

The 2N687 transistor finds extensive use in the following applications: - Audio amplifiers - Signal processing circuits - Switching circuits - Oscillator circuits - Voltage regulators

Detailed and Complete Alternative Models

Some alternative models to the 2N687 transistor include: - 2N3904 - BC547 - 2N2222 - 2N4401

In conclusion, the 2N687 transistor is a versatile component widely used in electronic circuits for amplification and switching purposes. Its high gain, low noise, and fast switching speed make it an essential part of various electronic devices and systems.

Word Count: 311

10 سوال و پاسخ رایج مربوط به کاربرد 2N687 در راه حل های فنی را فهرست کنید

  1. What is 2N687?

    • 2N687 is a silicon PNP transistor commonly used for amplification and switching applications in electronic circuits.

  2. What are the typical applications of 2N687?

    • It is commonly used in audio amplifiers, voltage regulators, and general purpose switching circuits.

  3. What are the key electrical characteristics of 2N687?

    • The key electrical characteristics include its maximum collector current, maximum power dissipation, and voltage ratings.

  4. How do I determine the pinout of 2N687?

    • The pinout of 2N687 is typically available in its datasheet, which shows the base, emitter, and collector terminals.

  5. What are some common alternatives to 2N687?

    • Common alternatives include 2N3906, BC557, and BC558, which are also PNP transistors with similar characteristics.

  6. Can 2N687 be used for high-frequency applications?

    • While 2N687 can be used for moderate frequency applications, it may not be suitable for high-frequency designs due to its transition frequency limitations.

  7. How do I calculate the biasing resistors for 2N687 in an amplifier circuit?

    • The biasing resistors can be calculated using the desired operating point, the transistor's base-emitter voltage, and the available supply voltage.

  8. What are the thermal considerations when using 2N687 in a circuit?

    • It is important to consider the thermal resistance of the transistor package and ensure proper heat sinking if the transistor is expected to dissipate significant power.

  9. Can 2N687 be used in a Darlington pair configuration?

    • Yes, 2N687 can be used as the first stage in a Darlington pair to achieve higher current gain and lower saturation voltage.

  10. Where can I find more detailed information about using 2N687 in technical solutions?

    • Detailed information can be found in the manufacturer's datasheet, application notes, and relevant electronics textbooks and resources.