2N5172 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): 100 to 500
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-92
• These Devices are Pb-Free and are RoHS Compliant

The 2N5172 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, base, and collector 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 2N5172 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2N5172 with the MPS650, MPS650G, MPS6532, MPS6601, MPS6601G, MPS6602, MPS6602G, MPSW01, MPSW01A, MPSW01AG or MPSW01G.