BF494 NPN Medium Frequency Transistor IC (Pack of 2)

The BF494 NPN Medium Frequency Transistor IC (Pack of 2) is a small-signal NPN bipolar junction transistor designed specifically for medium-frequency (MF) and radio-frequency (RF) applications. It is widely used in analog communication circuits such as FM radios, RF amplifiers, oscillators, and signal processing stages due to its stable performance and reliable switching behavior at higher frequencies.

The BF494 transistor is built to handle high-frequency signals efficiently while maintaining low noise levels. This makes it suitable for circuits where signal clarity and stability are important, especially in radio receiver front-ends and intermediate frequency (IF) stages. Its ability to amplify weak RF signals makes it a popular choice in communication electronics.

This transistor comes in a compact TO-92 package, which is easy to mount on breadboards and PCBs. Its small size makes it ideal for space-constrained electronic designs and prototyping projects. The pack includes 2 pieces, making it convenient for both learning and project-based applications.

The BF494 operates as an NPN transistor, meaning it controls current flow between collector and emitter based on a small input current at the base terminal. This property allows it to function as an amplifier or electronic switch in various circuit configurations.

Working Principle

The BF494 transistor works on the principle of current amplification:

• A small current applied to the base terminal controls a larger current flowing between the collector and emitter.

• In RF circuits, it amplifies weak high-frequency signals without significant distortion.

• It can also be configured in oscillator circuits to generate stable frequency signals.

Because of its design, it performs efficiently in medium-frequency ranges and is commonly used in analog signal processing.

Key Features

• NPN bipolar junction transistor

• Designed for medium-frequency and RF applications

• Compact TO-92 package for easy mounting

• Low noise operation

• Stable and reliable performance

• Suitable for amplification and switching

• Pack of 2 pieces

• Ideal for prototyping and electronics projects

Applications

The BF494 NPN Transistor is widely used in:

• FM radio receivers

• RF amplifiers

• Oscillator circuits

• IF (Intermediate Frequency) amplifier stages

• Communication devices

• Signal processing circuits

• DIY electronics projects

• Educational electronics experiments

• Wireless communication prototypes

• Analog circuit design

Specifications

• Product Type: NPN Medium Frequency Transistor

• Model: BF494

• Package Type: TO-92

• Transistor Type: NPN Bipolar Junction Transistor

• Frequency Range: Medium / RF applications

• Quantity: Pack of 2

• Function: Amplifier / Oscillator / Switch

Package Includes

• 2 × BF494 NPN Medium Frequency Transistors

Safety Precautions

• Avoid exceeding maximum voltage and current ratings.

• Handle with care to prevent static discharge damage.

• Ensure correct pin orientation before installation.

• Do not overheat during soldering.

• Use proper circuit design for RF applications.