B688 Power Transistor (2SB688)

The B688 transistor (commonly known as 2SB688) is a high-power PNP bipolar junction transistor designed for use in audio amplifier circuits and power regulation applications. It is widely used in complementary push-pull amplifier stages along with its NPN pair for efficient signal amplification.

This transistor is known for its strong current handling capability, low distortion performance, and reliable operation in high-power electronic circuits. It is commonly used in audio systems, power amplifiers, and voltage regulation modules.

Key Features

• High current handling capability
• Low distortion for audio amplification
• Suitable for complementary push-pull configuration
• High power dissipation capability
• Stable performance in linear applications
• Reliable switching and amplification characteristics

Technical Specifications

• Part Number: 2SB688 (B688)
• Type: PNP Power Transistor
• Collector-Emitter Voltage (Vce): approx. 80V
• Collector Current (Ic): up to 8A
• Power Dissipation: up to 80W (with proper heat sink)
• Transition Frequency: ~3 MHz (typical)
• Package Type: TO-220

Applications

• Audio power amplifiers
• Push-pull amplifier stages
• Power supply regulation circuits
• Voltage amplification circuits
• DIY amplifier projects
• Industrial electronic control systems