2SB1055-R Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -120 V
• Collector-Base Voltage, max: -120 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -6 A
• Collector Dissipation: 70 W
• DC Current Gain (h_fe): 40 to 80
• 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 2SB1055-R transistor can have a current gain of 40 to 80. The gain of the 2SB1055 will be in the range from 40 to 200, for the 2SB1055-P it will be in the range from 100 to 200, for the 2SB1055-Q it will be in the range from 60 to 120.Sometimes the "2S" prefix is not marked on the package - the 2SB1055-R might only be marked "B1055-R".The complementary NPN transistor to the 2SB1055-R is the 2SD1486-R.The BDP956 (SOT-223) is the SMD version of the 2SB1055-R transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SB1055-R with the 2SB1056, 2SB1056-R, 2SB1057 or 2SB1057-R.