2SB1223 Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -60 V
• Collector-Base Voltage, max: -70 V
• Emitter-Base Voltage, max: -6 V
• Collector Current − Continuous, max: -4 A
• Collector Dissipation: 20 W
• DC Current Gain (h_fe): 2000
• Transition Frequency, min: 20 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-220F

Here is an image showing the pin diagram of this transistor.Sometimes the "2S" prefix is not marked on the package - the 2SB1223 might only be marked "B1223".The complementary NPN transistor to the 2SB1223 is the 2SD1825.You can replace the 2SB1223 with the 2SA1259, 2SB1020, 2SB1020A, 2SB1024, 2SB1224, 2SB1225, 2SB1251, 2SB1251-P, 2SB1251-Q, 2SB1252, 2SB1252-P, 2SB1252-Q, 2SB1626, 2SB1626-O, 2SB1626-P, 2SB1626-Y, 2SB601, 2SB601-K, 2SB601-L, 2SB601-M, 2SB673, 2SB674, 2SB675, 2SB751-P, 2SB751-Q, 2SB751A-P, 2SB751A-Q, 2SB880, 2SB881, 2SB882, 2SB950, 2SB950-P, 2SB950-Q, 2SB950A, 2SB950A-P, 2SB950A-Q, 2SB951, 2SB951-P, 2SB951-Q, 2SB951A, 2SB951A-P, 2SB951A-Q, MJF127, MJF127G, MJF6668, MJF6668G or TTB1020B.