The 2SK492D from Isahaya Electronics is a Junction Field Effect Transistor (JFET) with Drain Saturation Current 2.5 to 6.0 mA, Gate Source Voltage -50 V, Forward Transfer Admittance 6 to 15 mS, Continous Drain Current 1 to 12 mA, Drain Source Resistance 70 Ohm. Tags: Surface Mount. More details for 2SK492D can be seen below.