BC161 Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -60 V
• Collector-Base Voltage, max: -60 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -1 A
• Collector Dissipation: 3.7 W
• DC Current Gain (h_fe): 40 to 250
• Transition Frequency, min: 50 MHz
• Operating and Storage Junction Temperature Range: -65 to +175 °C
• Package: TO-39

Here is an image showing the pin diagram of this transistor.The complementary NPN transistor to the BC161 is the BC141.The BCP52 (SOT-223) is the SMD version of the BC161 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the BC161 with the 2N5323 or BC461.