The FDC637BNZ from onsemi is a MOSFET with Continous Drain Current 6.2 A, Drain Source Resistance 21 to 41 milliohm, Drain Source Breakdown Voltage 20 V, Gate Source Voltage -12 to 12 V, Gate Source Threshold Voltage 1.5 V. Tags: Surface Mount. More details for FDC637BNZ can be seen below.