The FQD6N40C from onsemi is a MOSFET with Continous Drain Current 4.5 A, Drain Source Resistance 830 to 1000 milliohm, Drain Source Breakdown Voltage 400 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Surface Mount. More details for FQD6N40C can be seen below.