BC558: PNP Bipolar Junction Transistor for Analog and Switching Applications (Pack of 5)

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149 in stock


The BC558 is a PNP bipolar junction transistor (BJT) with the following specifications:

  • Type: PNP Bipolar Junction Transistor
  • Maximum Collector-Emitter Voltage (Vceo): -40V
  • Maximum Collector-Base Voltage (Vcbo): -40V
  • Maximum Emitter-Base Voltage (Vebo): -5V
  • Maximum Collector Current (Ic): -500mA
  • DC Current Gain (hFE): 40 to 800 (depending on the part number)
  • Package Types: TO-92, SOT-23

The BC558 is often used in low-noise amplifier and switching applications. Its PNP configuration makes it suitable for use in circuits where negative voltage switching is required.

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BC558: PNP Bipolar Junction Transistor for Analog and Switching Applications

The BC558 is a popular PNP bipolar junction transistor (BJT) used extensively in electronic circuits for switching and amplification purposes. Known for its reliability and ease of use, the BC558 is suitable for a wide range of applications including signal amplification, switching circuits, and analog signal processing.

Key Features and Specifications

  • Type: PNP Bipolar Junction Transistor
  • Collector-Emitter Voltage (V<sub>CE</sub>): -40V
  • Collector-Base Voltage (V<sub>CB</sub>): -40V
  • Emitter-Base Voltage (V<sub>EB</sub>): -5V
  • Continuous Collector Current (I<sub>C</sub>): -0.5A
  • Power Dissipation (P<sub>D</sub>): 500mW
  • Current Gain (h<sub>FE</sub>): 100 to 800
  • Package: TO-92

Applications

  1. Switching Circuits:
    • The BC558 is commonly used in switching applications where it acts as a switch to control the flow of current in various electronic circuits. It is well-suited for low to medium current switching tasks, such as in relay drivers, LED drivers, and general-purpose switching circuits.
  2. Signal Amplification:
    • In analog signal amplification, the BC558 is used as a signal amplifier in various audio and RF circuits. Its ability to provide high current gain makes it effective in amplifying weak signals to a higher level, ensuring that they can be processed further or used to drive other components.
  3. Inverter Circuits:
    • The BC558 can be used in inverter circuits where it functions to invert the logic levels or switch the state of the output signal. It is often employed in logic circuits and digital signal processing applications.
  4. Audio Amplifiers:
    • The BC558 is used in the design of audio amplifiers where it helps in boosting audio signals. Its low noise and high gain characteristics make it suitable for high-fidelity audio applications, such as in pre-amplifier stages of audio equipment.
  5. Voltage Regulation:
    • In voltage regulator circuits, the BC558 is used as a part of the feedback loop to stabilize the output voltage. Its ability to handle moderate current levels and its stable gain characteristics make it effective in maintaining voltage regulation in power supplies.

Advantages of Using BC558

  • High Gain: The BC558 provides a high current gain, making it suitable for applications requiring significant amplification.
  • Low Noise: It offers low noise characteristics, which is beneficial in audio and sensitive analog applications where signal clarity is crucial.
  • Versatile: The BC558 can be used in a wide range of circuits, including switching, amplification, and voltage regulation, making it a versatile component for various electronic designs.
  • Easy to Use: With its standard TO-92 package and well-documented specifications, the BC558 is easy to integrate into both prototype and production circuits.

Conclusion

The BC558 PNP transistor is a reliable and versatile component widely used in electronic circuits for switching and amplification tasks. Its high current gain, low noise characteristics, and capability to handle moderate currents make it a popular choice for designers and engineers. Whether you’re working on signal amplification, switching circuits, or voltage regulation, the BC558 offers dependable performance and ease of integration into your electronic projects.

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