The MMBFJ310LT1G from onsemi is a Junction Field Effect Transistor (JFET) with Drain Saturation Current 24 to 60 mA, Gate Source Voltage 25 V, Forward Transfer Admittance 8.0 to 18 mS, Gate Current 10 mA, Gate Reverse Current -1.0 nA. Tags: Surface Mount. More details for MMBFJ310LT1G can be seen below.