The IRF540S from Vishay is a MOSFET with Continous Drain Current 20 to 28 A, Drain Source Resistance 0.077 milliohm, Drain Source Breakdown Voltage 100 V, Gate Source Voltage 20 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Surface Mount. More details for IRF540S can be seen below.