The FQB5N90 from onsemi is a MOSFET with Continous Drain Current 5.4 A, Drain Source Resistance 1800 to 2300 milliohm, Drain Source Breakdown Voltage 900 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 3 to 5 V. Tags: Surface Mount. More details for FQB5N90 can be seen below.