The CMPF4393 BK from Central Semiconductor is a Junction Field Effect Transistor (JFET) with Drain Saturation Current 5.0 to 30 mA, Gate Source Voltage 40 V, Drain Source Resistance 100 Ohm, Gate Current 50 mA, Gate Reverse Current 0.5 nA. Tags: Surface Mount. More details for CMPF4393 BK can be seen below.