The 2SJ498B from Isahaya Electronics is a Junction Field Effect Transistor (JFET) with Drain Saturation Current 0.6 to 1.5 mA, Gate Source Voltage 50 V, Forward Transfer Admittance 1.5 to 4.0 mS, Continous Drain Current -0.6 to -12 mA, Drain Source Resistance 220 Ohm. Tags: Through Hole. More details for 2SJ498B can be seen below.