The STI20N65M5 from STMicroelectronics is a MOSFET with Continous Drain Current 18 A, Drain Source Resistance 160 to 190 Milliohm, Drain Source Breakdown Voltage 650 V, Gate Source Voltage - 25 to 25 V, Gate Source Threshold Voltage 3 to 5 V. Tags: Through Hole. More details for STI20N65M5 can be seen below.