BC161-6 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 100
• 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 BC161-6 is the BC141-6.The BCP52 (SOT-223) and BSR30 (SOT-89) is the SMD version of the BC161-6 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the BC161-6 with the 2N2102, 2N2102A, 2N4036, 2N4235, 2N4236, 2N4404, 2N4406, 2N5322, 2N5323, 2N5333, 2N5679, 2N5680, 2N6190, 2N6192, 2SA510, 2SA512, BC161 or BC461.