The TF412ST5G from onsemi is a Junction Field Effect Transistor (JFET) with Drain Saturation Current 1.2 to 3.0 mA, Forward Transfer Admittance 3.0 to 5.0 mS, Continous Drain Current 10 mA, Gate Current 10 mA, Gate Reverse Current -1.0 nA. Tags: Surface Mount. More details for TF412ST5G can be seen below.