The BC858ATR from Central Semiconductor is a Bipolar Junction Transistor with Emitter Base Voltage 5 V, Base Emitter Saturation Voltage 0.7 to 0.9 V, Emitter Cut off Current 100 nA, Collector Base Voltage 30 V, Collector Cut off Current 4 µA. Tags: Surface Mount, PNP Transistor. More details for BC858ATR can be seen below.