Original price was: ₹10.00.Current price is: ₹9.50.

The BF494 is a low-power NPN transistor commonly used in RF amplifier circuits. Operating at frequencies up to several hundred megahertz, it’s ideal for applications in FM radios, RF oscillators, and signal amplification stages. With its compact TO-92 package, it’s widely favored in hobbyist electronics and educational projects.

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BF494 Transistor: Versatile RF Amplifier for Electronics Projects

The BF494 transistor is a popular choice for RF (radio frequency) amplifier circuits due to its reliability and performance characteristics. This NPN transistor is well-suited for applications requiring signal amplification in the RF range, making it essential in FM radio receivers, RF oscillators, and other communication devices.

Key Features and Specifications

The BF494 transistor offers several key features that make it suitable for a variety of electronic applications:

  • Frequency Range: Capable of operating at frequencies ranging from a few megahertz to several hundred megahertz, making it ideal for RF applications.
  • Amplification Gain: Provides moderate gain suitable for amplifying weak RF signals, essential in communication and signal processing circuits.
  • Low Power Consumption: Designed for low-power applications, ensuring efficient use in battery-operated devices and energy-efficient circuits.
  • Compact Package: Housed in a TO-92 package, it is small and easy to integrate into compact electronic designs.

Applications in Electronics

The BF494 transistor finds extensive use in various electronics projects and applications:

  • FM Radio Receivers: Used in the RF amplifier stage to amplify incoming radio signals before demodulation.
  • RF Oscillators: Utilized in oscillator circuits to generate stable RF signals for transmission or local oscillator purposes.
  • Signal Amplification: Employed in general-purpose amplification circuits where moderate gain and RF capabilities are required.
  • Educational Projects: Valuable in classrooms and labs for teaching RF principles, transistor amplification, and circuit design.

Performance and Reliability

Known for its reliability, the BF494 transistor delivers consistent performance across different operating conditions:

  • Temperature Stability: Maintains stable operation over a wide temperature range, ensuring reliable performance in varying environments.
  • Voltage Requirements: Operates effectively with standard voltage levels typically found in electronic circuits, simplifying power supply design.
  • Noise Characteristics: Offers low noise figure, crucial for maintaining signal clarity and fidelity in RF applications.

Practical Considerations

When incorporating the BF494 transistor into your projects, consider the following practical aspects:

  • Biasing and Configuration: Ensure proper biasing to achieve desired amplification and stability in RF circuits.
  • Heat Dissipation: Although low-power, adequate heat dissipation measures should be considered to maintain transistor longevity.
  • Compatibility: Verify compatibility with other components and circuit configurations to optimize performance and reliability.


In conclusion, the BF494 transistor is an essential component for RF amplification in electronics projects, offering reliable performance and moderate gain across a broad frequency range. Whether you’re building an FM receiver, designing RF circuits, or experimenting with signal amplification, the BF494 transistor provides the necessary capabilities for successful project implementation. Invest in the BF494 transistor for robust RF amplification solutions in your next electronic endeavor.

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