The STW20N95DK5 from STMicroelectronics is a MOSFET with Continous Drain Current 18 A, Drain Source Resistance 275 to 330 Milliohm, Drain Source Breakdown Voltage 950 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 3 to 5 V. Tags: Through Hole. More details for STW20N95DK5 can be seen below.