The IRF520S from Vishay is a MOSFET with Continous Drain Current 6.5 to 9.2 A, Drain Source Resistance 0.27 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 IRF520S can be seen below.