2SB1090 Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -100 V
• Collector-Base Voltage, max: -100 V
• Emitter-Base Voltage, max: -7 V
• Collector Current − Continuous, max: -4 A
• Collector Dissipation: 40 W
• DC Current Gain (h_fe): 40 to 200
• Transition Frequency, min: 20 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-220

Here is an image showing the pin diagram of this transistor.The 2SB1090 transistor can have a current gain of 40 to 200. The gain of the 2SB1090-K will be in the range from 100 to 200, for the 2SB1090-L it will be in the range from 80 to 120, for the 2SB1090-M it will be in the range from 40 to 80.Sometimes the "2S" prefix is not marked on the package - the 2SB1090 might only be marked "B1090".The complementary NPN transistor to the 2SB1090 is the 2SD1568.The BDP954 (SOT-223) is the SMD version of the 2SB1090 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SB1090 with the 2SA1010, 2SB1016, 2SB1367, 2SB595, 2SB703A, 2SB995, BD244C, BD540C, BD802, BD954, BD956, BDT86, BDT86F, BDT88, BDT88F, BDT96, BDT96F, KSA1010, KTB1367, MJE15029, MJE15029G, MJE15031, MJE15031G, MJF15031 or MJF15031G.