The STB11NM80 from STMicroelectronics is a MOSFET with Continous Drain Current 11 A, Drain Source Resistance 35 to 40 Milliohm, Drain Source Breakdown Voltage 800 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 3 to 5 V. Tags: Surface Mount. More details for STB11NM80 can be seen below.