2SB1508 Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -50 V
• Collector-Base Voltage, max: -60 V
• Emitter-Base Voltage, max: -6 V
• Collector Current − Continuous, max: -12 A
• Collector Dissipation: 45 W
• DC Current Gain (h_fe): 70 to 280
• Transition Frequency, min: 10 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-3PF

Here is an image showing the pin diagram of this transistor.The 2SB1508 transistor can have a current gain of 70 to 280. The gain of the 2SB1508-Q will be in the range from 70 to 140, for the 2SB1508-R it will be in the range from 100 to 200, for the 2SB1508-S it will be in the range from 140 to 280.Sometimes the "2S" prefix is not marked on the package - the 2SB1508 might only be marked "B1508".The complementary NPN transistor to the 2SB1508 is the 2SD2281.You can replace the 2SB1508 with the 2SB1509.