The 2SC4394(TE85R) is a silicon NPN epitaxial planar transistor manufactured by Toshiba Semiconductor and Storage. It is generally used for high-frequency amplification and switching applications. Its characteristics make it suitable for VHF and UHF circuits, as well as various signal processing applications.

Applications

• VHF Amplifiers: Amplification of Very High Frequency signals in radio communication systems.
• UHF Amplifiers: Amplification of Ultra High Frequency signals in television and cellular communication systems.
• Oscillators: Signal generation in various electronic circuits requiring stable frequency output.
• Mixers: Frequency conversion in communication receivers and transmitters.
• Switching Circuits: High-speed switching applications in digital and analog circuits.

Features

• NPN Epitaxial Planar Transistor: Provides good high-frequency characteristics and reliability.
• High Transition Frequency (fT): Capable of operating at high frequencies, typically in the GHz range.
• Low Collector Output Capacitance: Minimizes signal loading and improves high-frequency performance.
• Small Package: Compact package design allows for high-density mounting on printed circuit boards. SOT-23 or similar is typical.
• High Gain-Bandwidth Product: Provides good amplification over a wide range of frequencies.

Benefits

• Improved Signal Strength: Enhances the reception and transmission of radio signals.
• Enhanced Circuit Performance: Provides efficient amplification and switching capabilities.
• Reduced Signal Loss: Minimizes signal degradation due to low output capacitance.
• Compact Design: Enables the miniaturization of electronic devices and circuits.
• Increased Reliability: Offers stable and reliable performance in various operating conditions.

Additional Details

The 2SC4394 typically has a collector-emitter voltage (VCEO) rating of around 12V, and a collector current (IC) rating around 30mA. The transition frequency (fT) usually exceeds 5 GHz. The (TE85R) suffix likely indicates tape and reel packaging specifications for automated assembly processes.