The JANTX2N4857 from Solitron Devices is a Junction Field Effect Transistor (JFET) with Gate Source Voltage -40 V, Continous Drain Current 20 to 100 mA, Drain Source Resistance 40 Ohm, Gate Current 50 mA, Gate Reverse Current -0.25 nA. Tags: Through Hole. More details for JANTX2N4857 can be seen below.