The U311 from New Jersey Semiconductor is a Junction Field Effect Transistor (JFET) with Drain Saturation Current 20 to 60 mA, Gate Source Voltage -25 V, Forward Transfer Admittance 1000 to 17000 mS, Gate Current 10 mA, Gate Reverse Current 150 nA. Tags: Through Hole. More details for U311 can be seen below.