The FCB290N80 from onsemi is a MOSFET with Continous Drain Current 17 A, Drain Source Resistance 290 milliohm, Drain Source Breakdown Voltage 800 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 4.5 V. Tags: Surface Mount. More details for FCB290N80 can be seen below.