• High voltage switching capability
• Designed for line output / horizontal deflection stages
• Fast switching performance
• High reliability for inductive loads

Typical Applications

• CRT television horizontal output stage
• High-voltage switching circuits
• Power switching in industrial electronics
• Flyback transformer driver circuits

Pin Configuration (TO-3 Package)

• Case:Collector
• Pin 1:Base
• Pin 2:Emitter
• If you want, I can also provide:
• Equivalent / replacement transistors for BU109
• Full datasheet values (switching times, safe operating area, etc.)
• Comparison with BU208, BU508, BU508A(commonly used substitutes).

• Transistor Type: NPN Silicon Power Transistor
• Package: TO-3 metal case
• Collector-Emitter Voltage (VCEO): 700 V (max)
• Collector-Base Voltage (VCBO): 1500 V (max)
• Emitter-Base Voltage (VEBO): 5 V (max)
• Collector Current (IC): 8 A (continuous)
• Peak Collector Current (ICM): 15 A
• Power Dissipation (Pc): 75 W
• DC Current Gain (hFE): 5 – 20
• Transition Frequency (fT): ~4 MHz
• Operating Junction Temperature: −65 °C to +150 °C