The SIF18N20AD from First Silicon is a MOSFET with Continous Drain Current 9 to 18 A, Drain Source Resistance 0.12 to 0.15 ohm, Drain Source Breakdown Voltage 200 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 2.0 to 4.0 V. Tags: Surface Mount. More details for SIF18N20AD can be seen below.