2N3415 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 25 V
• Collector-Base Voltage, max: 25 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 0.5 A
• Collector Dissipation: 0.625 W
• DC Current Gain (h_fe): 180 to 540
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-92

The 2N3415 is manufactured in a plastic TO-92 case. When looking at the flat side with the leads pointed downward, the three leads emerging from the transistor are, from left to right, the emitter, collector, and base leads.
Here is an image showing the pin diagram of this transistor.The BC818 (SOT-23) and BC818W (SOT-323) is the SMD version of the 2N3415 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2N3415 with the 2N3394, 2N3417, 2SC2500, 2SC2500-A, 2SC2500-B, 2SC2500-C, 2SC2500-D, 2SC3916, 2SC3917, 2SC3918, 2SC3919, 2SC3920, 2SC3921, 2SC3922, 2SC3923, 2SD1207, 2SD1347, 2SD1616, 2SD1835, 2SD545, 2SD789, KSC2500, KSC2500-A, KSC2500-B, KSC2500-C, KSC2500-D, KSC5019, KSD1616 or NTE192A.