The FQB5N50C from onsemi is a MOSFET with Continous Drain Current 5 A, Drain Source Resistance 1140 to 1400 milliohm, Drain Source Breakdown Voltage 500 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Surface Mount. More details for FQB5N50C can be seen below.