2SB554 Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -180 V
• Collector-Base Voltage, max: -180 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -15 A
• Collector Dissipation: 150 W
• DC Current Gain (h_fe): 40 to 140
• Transition Frequency, min: 6 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-3

Here is an image showing the pin diagram of this transistor.The 2SB554 transistor can have a current gain of 40 to 140. The gain of the 2SB554-O will be in the range from 70 to 140, for the 2SB554-R it will be in the range from 40 to 80.Sometimes the "2S" prefix is not marked on the package - the 2SB554 might only be marked "B554".The complementary NPN transistor to the 2SB554 is the 2SD424.You can replace the 2SB554 with the 2SA909 or 2SB723.