BC178B Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -25 V
• Collector-Base Voltage, max: -30 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -0.1 A
• Collector Dissipation: 0.3 W
• DC Current Gain (h_fe): 240 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 BC178B transistor can have a current gain of 240 to 500. The gain of the BC178 will be in the range from 125 to 500, for the BC178A it will be in the range from 125 to 260.The complementary NPN transistor to the BC178B is the BC108B.The BC858 (SOT-23), BC858B (SOT-23), BC858BW (SOT-323), BC858W (SOT-323), BC859 (SOT-23), BC859B (SOT-23), BC859BW (SOT-323) and BC859W (SOT-323) is the SMD version of the BC178B transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the BC178B with the BC177, BC177B, BC479, BCY70, BCY71 or BCY72.