BC169 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 20 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): 110 to 800
• Transition Frequency, min: 250 MHz
• Noise Figure, max: 1.5 dB
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-92

The BC169 is manufactured in a plastic TO-92 case. When looking at the flat side with the leads pointed downward, the three leads emerging from the transistor are, from left to right, the emitter, collector, and base leads.
Here is an image showing the pin diagram of this transistor.The BC169 transistor can have a current gain of 110 to 800. The gain of the BC169A will be in the range from 110 to 220, for the BC169B it will be in the range from 200 to 450, for the BC169C it will be in the range from 420 to 800.The complementary PNP transistor to the BC169 is the BC259.The MMBTH10 (SOT-23) is the SMD version of the BC169 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the BC169 with the 2N3394 or BC168.