The 2SJ125E from Isahaya Electronics is a Junction Field Effect Transistor (JFET) with Drain Saturation Current 5.0 to 12 mA, Gate Source Voltage 50 V, Forward Transfer Admittance 1.5 to 4.0 mS, Continous Drain Current -1.0 to -12 mA, Drain Source Resistance 220 Ohm. Tags: Surface Mount. More details for 2SJ125E can be seen below.