The STP18N65M2 from STMicroelectronics is a MOSFET with Continous Drain Current 12 A, Drain Source Resistance 275 to 330 Milliohm, Drain Source Breakdown Voltage 650 V, Gate Source Voltage - 25 to 25 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Through Hole. More details for STP18N65M2 can be seen below.