2SB1090-K 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): 100 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-K transistor can have a current gain of 100 to 200. The gain of the 2SB1090 will be in the range from 40 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-K might only be marked "B1090-K".The complementary NPN transistor to the 2SB1090-K is the 2SD1568-K.The BDP954 (SOT-223) is the SMD version of the 2SB1090-K transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SB1090-K with the 2SA1010, 2SA1010K, 2SA1077, 2SB1016, 2SB1016A, 2SB1367, 2SB595, 2SB703A, 2SB703A-Q, 2SB995, BD244C, BD540C, BD544C, BD546C, BD802, BD954, BD956, BDT86, BDT86F, BDT88, BDT88F, BDT96, BDT96F, KSA1010, KSA1010Y, KTA1038, KTA1049, KTB1367, MJE15029, MJE15029G, MJE15031, MJE15031G, MJF15031 or MJF15031G.