The 2SK2145 from Toshiba is a Junction Field Effect Transistor (JFET) with Gate Source Voltage -30 V, Forward Transfer Admittance 4.0 to 15 mS, Continous Drain Current 1.2 to 14.0 mA, Gate Current 10 mA, Gate Reverse Current -1.0 nA. Tags: Surface Mount. More details for 2SK2145 can be seen below.