The MDD9N40RH from Magnachip Semiconductor is a MOSFET with Continous Drain Current 3.79 to 6.0 A, Drain Source Resistance 0.67 to 0.85 ohm, Drain Source Breakdown Voltage 400 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 3.0 to 5.0 V. Tags: Surface Mount. More details for MDD9N40RH can be seen below.