2SB1255-Q Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -140 V
• Collector-Base Voltage, max: -160 V
• Emitter-Base Voltage, max: -8 V
• Collector Current − Continuous, max: -15 A
• Collector Dissipation: 100 W
• DC Current Gain (h_fe): 8000 to 30000
• Transition Frequency, min: 20 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-3PF

Here is an image showing the pin diagram of this transistor.The 2SB1255-Q transistor can have a current gain of 8000 to 30000. The gain of the 2SB1255 will be in the range from 5000 to 30000, for the 2SB1255-P it will be in the range from 5000 to 15000.Sometimes the "2S" prefix is not marked on the package - the 2SB1255-Q might only be marked "B1255-Q".The complementary NPN transistor to the 2SB1255-Q is the 2SD1895-Q.