The IRF540D from First Silicon is a MOSFET with Continous Drain Current 28.5 to 45 A, Drain Source Resistance 14 to 21.5 milli-ohm, Drain Source Breakdown Voltage 100 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1 to 3 V. Tags: Surface Mount. More details for IRF540D can be seen below.