The IRF9510S from Vishay is a MOSFET with Continous Drain Current -4 A, Drain Source Resistance 1200 milliohm, Drain Source Breakdown Voltage -100 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage -2 to -4 V. Tags: Surface Mount. More details for IRF9510S can be seen below.