The MDF18N50BTH from Magnachip Semiconductor is a MOSFET with Continous Drain Current 11 to 18 A, Drain Source Resistance 0.22 to 0.27 ohm, Drain Source Breakdown Voltage 500 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 2.0 to 4.0 V. Tags: Through Hole. More details for MDF18N50BTH can be seen below.