The MMBF4393LT1G from onsemi is a Junction Field Effect Transistor (JFET) with Drain Saturation Current 5.0 to 30 mA, Gate Source Voltage 30 V, Drain Source Resistance 100 Ohm, Gate Current 50 mA, Gate Reverse Current 1.0 nA. Tags: Surface Mount. More details for MMBF4393LT1G can be seen below.