The 2SK3663 from Renesas is a MOSFET with Continous Drain Current -0.5 to 0.5 A, Drain Source Resistance 380 to 880 milliohm, Drain Source Breakdown Voltage 20 V, Gate Source Voltage -12 to 12 V, Power Dissipation 0.2 W. Tags: Surface Mount. More details for 2SK3663 can be seen below.