The UN300N23T from UN Semiconductor is a MOSFET with Continous Drain Current 5.8 A, Drain Source Resistance 27 to 40 milli-ohm, Drain Source Breakdown Voltage 30 V, Gate Source Voltage -12 to 12 V, Gate Source Threshold Voltage 0.7 to 1.4 V. Tags: Surface Mount. More details for UN300N23T can be seen below.