The 2SK303V4 from KEXIN is a Junction Field Effect Transistor (JFET) with Drain Saturation Current 2.5 to 6.0 mA, Forward Transfer Admittance 2.5 to 6.0 mS, Continous Drain Current 20 mA, Drain Source Breakdown Voltage 30 V, Drain Source Resistance 250 Ohm. Tags: Surface Mount. More details for 2SK303V4 can be seen below.