BC858 Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -30 V
• Collector-Base Voltage, max: -30 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 BC858 transistor can have a current gain of 110 to 800. The gain of the BC858A will be in the range from 110 to 220, for the BC858B it will be in the range from 200 to 450, for the BC858C it will be in the range from 420 to 800.The complementary NPN transistor to the BC858 is the BC848.You can replace the BC858 with the 2SA1518, 2SA1519, 2SA1520, 2SA1521, BC857, BC859, BC860, FMMTA55, KST55, MMBTA55 or SMBTA55.