2SB903-Q Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -30 V
• Collector-Base Voltage, max: -60 V
• Emitter-Base Voltage, max: -6 V
• Collector Current − Continuous, max: -12 A
• Collector Dissipation: 35 W
• DC Current Gain (h_fe): 70 to 140
• Transition Frequency, min: 120 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 2SB903-Q transistor can have a current gain of 70 to 140. The gain of the 2SB903 will be in the range from 70 to 280, for the 2SB903-R it will be in the range from 100 to 200, for the 2SB903-S it will be in the range from 140 to 280.Sometimes the "2S" prefix is not marked on the package - the 2SB903-Q might only be marked "B903-Q".The complementary NPN transistor to the 2SB903-Q is the 2SD1212-Q.You can replace the 2SB903-Q with the 2N6489, 2N6489G, 2N6490, 2N6490G, 2SA1328, 2SA1328-O, 2SA1451, 2SA1451-O, 2SA1451A, 2SA1451A-O, 2SB1136, 2SB1136-Q, 2SB826, 2SB826-Q, BD546, BD546A, BD706, BD708, BD744, BD744A, BD906, BD908, BDT82 or BDT82F.