The FDC5661N-F085 from onsemi is a MOSFET with Continous Drain Current 4.3 A, Drain Source Resistance 38 to 86 milli-ohm, Drain Source Breakdown Voltage 60 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1 to 3 V. Tags: Surface Mount. More details for FDC5661N-F085 can be seen below.