The FDC637AN from onsemi is a MOSFET with Continous Drain Current 6.2 A, Drain Source Resistance 0.019 to 0.041 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 FDC637AN can be seen below.