The FDD18N20LZ from onsemi is a MOSFET with Continous Drain Current 16 A, Drain Source Resistance 125 milliohm, Drain Source Breakdown Voltage 200 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 2.5 V. Tags: Surface Mount. More details for FDD18N20LZ can be seen below.