IRF4905PBF: Overview, Features, and Applications

IRF4905PBF Overview:

The IRF4905PBF is a Power MOSFET transistor designed for power applications. It is a member of the N-channel power MOSFET family developed by International Rectifier (now part of Infineon Technologies). The IRF4905PBF is known for its high power-handling capabilities and efficiency in demanding circuit configurations.


Features of IRF4905PBF:

  1. MOSFET Transistor: N-channel enhancement mode power MOSFET suitable for high power applications.

  2. High Voltage and Current Rating: Capable of handling high voltages and currents, making it ideal for power circuits.

  3. Low On-Resistance: Offers low RDS(on) (on-resistance) characteristics, leading to reduced conduction losses and improved efficiency.

  4. Fast Switching Speeds: Enables rapid switching operations in power electronics applications.

  5. TO-220 Package: Typically housed in a TO-220 package, allowing for efficient heat dissipation and ease of mounting.

  6. Temperature Stability: Features good thermal performance and stability under various operating conditions.

Technical Specifications:

  • Part Number: IRF4905PBF
  • Polarity: N-Channel
  • Voltage Rating: Typically around 55V
  • Current Rating: Can handle several tens of amperes
  • Package Type: TO-220
  • On-Resistance: Low RDS(on) for efficient power handling
  • Temperature Range: Operates effectively within specified temperature ranges
  • DataSheet IRF4905PBF PDF

Applications of IRF4905PBF:

  1. Switch Mode Power Supplies (SMPS): Used in power supply circuits for efficient power conversion and regulation.

  2. Motor Drive Circuits: Employed in motor control applications for driving DC motors efficiently.

  3. Voltage Regulation: Utilized in voltage regulation circuits to ensure stable and precise output voltages.

  4. Power Inverters: Found in applications like solar inverters and uninterruptible power supplies (UPS) for power management.

  5. Electronic Loads: Used in electronic load circuits to control and dissipate power efficiently.


  • The IRF4905PBF is a versatile power MOSFET suitable for various applications requiring high power handling and efficiency.
  • Proper thermal management is crucial to maintain the MOSFET within its operating temperature limits for optimal performance and longevity.
  • When designing with the IRF4905PBF, consider the voltage, current, power dissipation, and switching characteristics relevant to your specific application requirements.

The IRF4905PBF Power MOSFET from Infineon Technologies offers a robust solution for power electronics applications demanding high performance, efficiency, and reliability. Its features make it well-suited for a wide range of power circuit designs where efficient power handling and switching capabilities are essential.

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