BC177 Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -45 V
• Collector-Base Voltage, max: -50 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -0.1 A
• Collector Dissipation: 0.3 W
• DC Current Gain (h_fe): 125 to 500
• Transition Frequency, min: 200 MHz
• Noise Figure, max: 2 dB
• Operating and Storage Junction Temperature Range: -65 to +175 °C
• Package: TO-18

Here is an image showing the pin diagram of this transistor.The BC177 transistor can have a current gain of 125 to 500. The gain of the BC177A will be in the range from 125 to 260, for the BC177B it will be in the range from 240 to 500.The complementary NPN transistor to the BC177 is the BC107.The 2SA812 (SOT-23), BC857 (SOT-23), BC857W (SOT-323), BC860 (SOT-23), BC860W (SOT-323) and KSA812 (SOT-23) is the SMD version of the BC177 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the BC177 with the 2N3496 or BCY71.