The 2N4393 TO-18 3L RoHS from Linear Systems is a Junction Field Effect Transistor (JFET) with Drain Saturation Current 5 to 125 mA, Gate Source Voltage 0.7 to 1 V, Continous Drain Current 3 mA, Drain Source Breakdown Voltage 0.25 to 0.4 V, Drain Source Resistance 100 Ohm. Tags: Through Hole. More details for 2N4393 TO-18 3L RoHS can be seen below.