The 2SB647A is a PNP silicon transistor manufactured by Hitachi. It is primarily designed for audio frequency power amplifier applications. The transistor offers a good balance of current gain, voltage handling, and power dissipation, making it suitable for use in various audio amplifier stages.

Applications

• Audio power amplifiers
• Driver stages in audio amplifiers
• General-purpose amplification
• Switching circuits
• DC-DC converters

Features

• PNP silicon transistor
• High collector current (IC = -1A)
• Low saturation voltage
• High hFE (current gain)
• Complementary to NPN transistor 2SD667A

Benefits

• Suitable for Audio Amplification: Designed specifically for audio frequency applications, providing good linearity and low distortion.
• Efficient Power Handling: Capable of handling moderate collector currents, making it suitable for medium-power audio amplifiers.
• Complementary Design: Complementary pair with the 2SD667A simplifies push-pull amplifier designs.
• Reliable Performance: Offers stable performance over a range of operating conditions.
• Versatile Usage: Can be used in amplification and switching circuits, providing design flexibility.

Additional Details

The 2SB647A is typically packaged in a TO-126 type package, facilitating heat dissipation. Key electrical characteristics include a collector-base voltage (VCBO) of -60V, a collector-emitter voltage (VCEO) of -50V, and an emitter-base voltage (VEBO) of -5V. The collector current (IC) is rated at -1A. The collector power dissipation (PC) depends on the ambient temperature and heat sinking, but typically falls in the 0.8W to 1W range without significant heat sinking. It's frequently used in Class AB audio amplifiers due to its linearity and power handling capabilities.

The 2SB647A is often paired with its NPN complement, the 2SD667A, in push-pull amplifier configurations. This complementary design allows for symmetrical output waveforms and improved efficiency. The low saturation voltage of the 2SB647A also contributes to reduced power loss, enhancing overall amplifier performance. This transistor is a reliable and cost-effective solution for various audio amplification needs.