The STW18NM80 from STMicroelectronics is a MOSFET with Continous Drain Current 17 A, Drain Source Resistance 250 to 295 Milliohm, Drain Source Breakdown Voltage 800 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 3 to 5 V. Tags: Through Hole. More details for STW18NM80 can be seen below.