The MDD4N20YRH from Magnachip Semiconductor is a MOSFET with Continous Drain Current 1.9 to 3.0 A, Drain Source Resistance 1.1 to 1.35 ohm, Drain Source Breakdown Voltage 200 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1.0 to 2.0 V. Tags: Surface Mount. More details for MDD4N20YRH can be seen below.