2SB1123-S Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -50 V
• Collector-Base Voltage, max: -60 V
• Emitter-Base Voltage, max: -6 V
• Collector Current − Continuous, max: -2 A
• Collector Dissipation: 0.5 W
• DC Current Gain (h_fe): 140 to 280
• Transition Frequency, min: 150 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: SOT-89

Here is an image showing the pin diagram of this transistor.The 2SB1123-S transistor can have a current gain of 140 to 280. The gain of the 2SB1123 will be in the range from 100 to 560, for the 2SB1123-R it will be in the range from 100 to 200, for the 2SB1123-T it will be in the range from 200 to 400, for the 2SB1123-U it will be in the range from 280 to 560.The 2SB1123-S transistor is marked as "BFS".The complementary NPN transistor to the 2SB1123-S is the 2SD1623-S.You can replace the 2SB1123-S with the 2SB1124, 2SB1124-S or 2STF2550.