The 2N4220 from CALOGIC is a Junction Field Effect Transistor (JFET) with Drain Saturation Current 0.5 to 3 mA, Gate Source Voltage -30 V, Gate Current 10 mA, Gate Reverse Current -0.1 µA, Power Dissipation 0.3 W. Tags: Through Hole. More details for 2N4220 can be seen below.