BC169B 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): 200 to 450
• 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 BC169B 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 BC169B transistor can have a current gain of 200 to 450. The gain of the BC169 will be in the range from 110 to 800, for the BC169A it will be in the range from 110 to 220, for the BC169C it will be in the range from 420 to 800.The complementary PNP transistor to the BC169B is the BC259B.The MMBTH10 (SOT-23) is the SMD version of the BC169B transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the BC169B with the 2N3394, 2N3415, 2N3706, 2N3708, 2N3711, 2SC1571, 2SC1842, 2SC2500, 2SC2500-A, 2SC2500-B, 2SC2500-C, 2SC2500-D, 2SC3242A, 2SC3266, 2SC458, 2SC536, 2SD545, 2SD734, BC168, BC168B, BC184L, KSC2500, KSC2500-A, KSC2500-B, KSC2500-C, KSC2500-D, KSC5019, KTC2874, KTC2874-A or KTD1146.