BC478 Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -40 V
• Collector-Base Voltage, max: -40 V
• Emitter-Base Voltage, max: -6 V
• Collector Current − Continuous, max: -0.15 A
• Collector Dissipation: 0.36 W
• DC Current Gain (h_fe): 110 to 450
• Noise Figure, max: 1.2 dB
• Operating and Storage Junction Temperature Range: -55 to +200 °C
• Package: TO-18

Here is an image showing the pin diagram of this transistor.The BC857 (SOT-23), BC857W (SOT-323), BC860 (SOT-23) and BC860W (SOT-323) is the SMD version of the BC478 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the BC478 with the BCY70 or BCY71.