The FDS9431A from onsemi is a MOSFET with Continous Drain Current -3.5 A, Drain Source Resistance 110 to 220 milliohm, Drain Source Breakdown Voltage -20 V, Gate Source Voltage -8 to 8 V, Gate Source Threshold Voltage -1 V. Tags: Surface Mount. More details for FDS9431A can be seen below.