The 2N3821 from New Jersey Semiconductor is a Junction Field Effect Transistor (JFET) with Gate Source Voltage -50 V, Forward Transfer Admittance 1500 to 4500 mS, Continous Drain Current 10 mA, Gate Reverse Current 0.1 nA, Power Dissipation 0.3 W. Tags: Through Hole. More details for 2N3821 can be seen below.