The UN300DN26T from UN Semiconductor is a MOSFET with Continous Drain Current 4.4 A, Drain Source Resistance 20 to 40 milli-ohm, Drain Source Breakdown Voltage 30 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1 to 2.5 V. Tags: Surface Mount. More details for UN300DN26T can be seen below.