The U402 from New Jersey Semiconductor is a Junction Field Effect Transistor (JFET) with Drain Saturation Current 0.5 to 10.0 mA, Gate Source Voltage -2.3 V, Forward Transfer Admittance 2000 to 7000 mS, Gate Current 10 mA, Gate Reverse Current -25 pA. Tags: Through Hole. More details for U402 can be seen below.