The 2N4903 from Solitron Devices is a Junction Field Effect Transistor (JFET) with Drain Saturation Current 8 nA, Gate Source Voltage -40 V, Continous Drain Current 1 nA, Drain Source Resistance 80 Ohm, Gate Current 50 mA. Tags: Through Hole. More details for 2N4903 can be seen below.