The IXTT40N50L2 from Littelfuse is a MOSFET with Continous Drain Current 40 A, Drain Source Resistance 170 Milliohm, Drain Source Breakdown Voltage 500 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 2.5 to 4.5 V. Tags: Surface Mount. More details for IXTT40N50L2 can be seen below.