The 2SD974 is a silicon NPN epitaxial planar transistor manufactured by Hitachi, Ltd. It is designed for use in various high-power amplification and switching applications.

Applications:

• Power Amplifiers: Used in audio power amplifiers to amplify audio signals to drive speakers.
• Switching Regulators: Employed in switching regulators for voltage conversion and regulation.
• DC-DC Converters: Integrated into DC-DC converters for converting direct current from one voltage level to another.
• Motor Control: Utilized in motor control circuits for controlling the speed and direction of motors.
• General Purpose Amplification: Suitable for general-purpose amplification in various electronic circuits.

Features:

• High Collector Current: Capable of handling high collector current, making it suitable for high-power applications.
• High Voltage: Features a high collector-emitter voltage rating.
• Low Saturation Voltage: Exhibits low saturation voltage, resulting in efficient switching performance.
• Fast Switching Speed: Offers fast switching speed for efficient operation in switching circuits.
• High Power Dissipation: Designed to handle high power dissipation.

Benefits:

• Efficient Power Amplification: Provides efficient power amplification due to its high current and voltage capabilities.
• Reliable Switching: Offers reliable switching performance in switching regulators and DC-DC converters.
• Versatile Application: Suitable for a wide range of applications, including power amplifiers, switching regulators, and motor control circuits.
• Robust Performance: Delivers robust performance in various operating conditions.
• Improved System Efficiency: Helps improve system efficiency due to its low saturation voltage and fast switching speed.

Technical Specifications:

The 2SD974 typically has the following specifications:

• Collector-Emitter Voltage (VCEO): 150V
• Collector Current (IC): 7A
• Power Dissipation (PC): 80W
• DC Current Gain (hFE): Typically between 40 and 140 (depending on the specific grade)
• Operating Temperature Range: -55°C to +150°C

The device is typically available in a TO-3P package.