The STL36N55M5 from STMicroelectronics is a MOSFET with Continous Drain Current 22.5 A, Drain Source Resistance 66 to 90 Milliohm, Drain Source Breakdown Voltage 550 V, Gate Source Voltage - 25 to 25 V, Gate Source Threshold Voltage 3 to 5 V. Tags: Surface Mount. More details for STL36N55M5 can be seen below.