The IXFT18N100Q3 from Littelfuse is a MOSFET with Continous Drain Current 18 A, Drain Source Resistance 660 Milliohm, Drain Source Breakdown Voltage 1000 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 3.5 to 6.5 V. Tags: Surface Mount. More details for IXFT18N100Q3 can be seen below.