The 2N4339 from Solitron Devices is a Junction Field Effect Transistor (JFET) with Drain Saturation Current 0.5 to 1.5 mA, Gate Source Voltage -50 V, Forward Transfer Admittance 800 to 2400 µs, Continous Drain Current 0.1 µA, Drain Source Resistance 1700 Ohm. Tags: Through Hole. More details for 2N4339 can be seen below.