The Vishay BFR91 is an NPN silicon RF transistor designed for high-frequency amplifier and oscillator applications. Being an end-of-life product, it is important to note that while replacement options should be considered for new designs, knowing its specifications is important for maintaining legacy systems.

Applications

• RF amplifiers
• RF oscillators
• Mixers
• High-frequency switches
• Tuners

Features

• High transition frequency (fT)
• Low noise figure
• High gain
• Small signal transistor
• NPN polarity

Benefits

• Excellent performance in high-frequency circuits.
• Minimal noise contribution, ensuring clean signal amplification.
• Efficient signal amplification, maximizing signal strength.
• Suitable for a wide range of RF applications.
• Easy integration into existing circuits.

Additional Details

The BFR91's transition frequency (fT) is a crucial parameter for its high-frequency performance. Its low noise figure ensures minimal signal degradation during amplification. The datasheet specifies detailed electrical characteristics, including voltage and current ratings, as well as S-parameters for circuit design. Ensuring proper thermal management is important for reliable operation.