The IXFA56N30X3 from Littelfuse is a MOSFET with Continous Drain Current 56 A, Drain Source Resistance 27 Milliohm, Drain Source Breakdown Voltage 300 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 2.5 to 4.5 V. Tags: Surface Mount. More details for IXFA56N30X3 can be seen below.