The UN0408N2R0-PD56 from UN Semiconductor is a MOSFET with Continous Drain Current 85 A, Drain Source Resistance 2.0 to 4.0 milli-ohm, Drain Source Breakdown Voltage 40 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1 to 2.5 V. Tags: Surface Mount. More details for UN0408N2R0-PD56 can be seen below.