The FDC5661N from onsemi is a MOSFET with Continous Drain Current 4.3 A, Drain Source Resistance 47 milliohm, Drain Source Breakdown Voltage 60 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 3 V. Tags: Surface Mount. More details for FDC5661N can be seen below.