BC857 Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -45 V
• Collector-Base Voltage, max: -50 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -0.1 A
• Collector Dissipation: 0.25 W
• DC Current Gain (h_fe): 110 to 800
• Transition Frequency, min: 150 MHz
• Noise Figure, max: 2 dB
• Operating and Storage Junction Temperature Range: -65 to +150 °C
• Package: SOT-23

Here is an image showing the pin diagram of this transistor.The BC857 transistor can have a current gain of 110 to 800. The gain of the BC857A will be in the range from 110 to 220, for the BC857B it will be in the range from 200 to 450, for the BC857C it will be in the range from 420 to 800.The complementary NPN transistor to the BC857 is the BC847.You can replace the BC857 with the 2SA1518, 2SA1519, 2SA1520, 2SA1521, BC856, BC860, FMMTA55, FMMTA56, KST55, KST56, MMBTA55, MMBTA56, PMBTA56, SMBTA55 or SMBTA56.