The FDN339AN from onsemi is a MOSFET with Continous Drain Current 3 A, Drain Source Resistance 29 to 50 milliohm, Drain Source Breakdown Voltage 20 V, Gate Source Voltage -8 to 8 V, Gate Source Threshold Voltage 1.5 V. Tags: Surface Mount. More details for FDN339AN can be seen below.