The 2N3391 is a silicon NPN bipolar junction transistor (BJT). Originally manufactured by Fairchild Semiconductor and now also produced by ON Semiconductor, this transistor is designed for general purpose amplifier and switching applications. Its key attributes include medium voltage and current handling capabilities along with good gain characteristics.

Applications:

• General Purpose Amplifiers: Used in various amplifier circuits for amplifying audio and other signals.
• Switching Circuits: Employed as a switch to control current flow in digital and analog circuits.
• Driver Stages: Can be used as a driver for higher current or voltage devices.
• Oscillators: Suitable for use in oscillator circuits to generate periodic signals.
• Linear Regulators: Used as a pass transistor in linear voltage regulators.

Features:

• NPN Polarity: Standard NPN transistor configuration.
• Medium Voltage and Current: Capable of handling moderate voltage and current levels.
• High Gain (hFE): Offers substantial current amplification.
• Low Saturation Voltage: Low voltage drop when fully turned on.
• Fast Switching Speed: Capable of rapid switching between on and off states.

Benefits:

• Versatile Application: Suitable for a wide range of amplifier and switching applications.
• Good Amplification: High gain provides significant signal amplification.
• Efficient Switching: Low saturation voltage minimizes power loss during switching.
• Reliable Performance: Provides dependable performance in various operating conditions.
• Easy to Use: Standard BJT configuration simplifies circuit design and implementation.

Technical Specifications:

• Collector-Emitter Voltage (VCEO): 40V
• Collector-Base Voltage (VCBO): 60V
• Emitter-Base Voltage (VEBO): 5V
• Collector Current (IC): 0.5A
• Power Dissipation (PD): 0.8W
• DC Current Gain (hFE): 40 to 240 (typical)

For detailed specifications, refer to the Fairchild or ON Semiconductor datasheet for the 2N3391.