2SD415-S Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 100 V
• Collector-Base Voltage, max: 120 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 0.8 A
• Collector Dissipation: 10 W
• DC Current Gain (h_fe): 40 to 80
• Transition Frequency, min: 45 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-126

Here is an image showing the pin diagram of this transistor.The 2SD415-S transistor can have a current gain of 40 to 80. The gain of the 2SD415 will be in the range from 40 to 320, for the 2SD415-P it will be in the range from 160 to 320, for the 2SD415-Q it will be in the range from 100 to 200, for the 2SD415-R it will be in the range from 60 to 120.Sometimes the "2S" prefix is not marked on the package - the 2SD415-S might only be marked "D415-S".The complementary PNP transistor to the 2SD415-S is the 2SB549-S.You can replace the 2SD415-S with the BD791, MJE243, MJE243G or MJE244.