The 2N4859 from New Jersey Semiconductor is a Junction Field Effect Transistor (JFET) with Gate Source Voltage 30 V, Continous Drain Current 50 mA, Drain Source Breakdown Voltage 30 V, Drain Source Resistance 25 Ohm, Gate Current 50 mA. Tags: Through Hole. More details for 2N4859 can be seen below.