BC171B Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 45 V
• Collector-Base Voltage, max: 50 V
• Emitter-Base Voltage, max: 6 V
• Collector Current − Continuous, max: 0.1 A
• Collector Dissipation: 0.3 W
• DC Current Gain (h_fe): 200 to 450
• Noise Figure, max: 10 dB
• Operating and Storage Junction Temperature Range: -65 to +150 °C
• Package: TO-92

The BC171B 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 collector, base, and emitter leads.
Here is an image showing the pin diagram of this transistor.The BC171B transistor can have a current gain of 200 to 450. The gain of the BC171 will be in the range from 110 to 450, for the BC171A it will be in the range from 110 to 220.The 2SC1623 (SOT-23), 2SD601A (SOT-23), BC847 (SOT-23), BC847B (SOT-23), BC847BW (SOT-323), BC847W (SOT-323), BC850 (SOT-23), BC850B (SOT-23), BC850BW (SOT-323), BC850W (SOT-323), KSC1623 (SOT-23) and MMBT5210 (SOT-23) is the SMD version of the BC171B transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the BC171B with the BC182, BC182B, BC237, BC237B, BC337, BC414, BC414B, BC445, BC445B, BC447, BC447B, BC546, BC546B, BC547, BC547B, BC550 or BC550B.