The STL12N60M2 from STMicroelectronics is a MOSFET with Continous Drain Current 6.5 A, Drain Source Resistance 400 to 495 Milliohm, Drain Source Breakdown Voltage 600 V, Gate Source Voltage - 25 to 25 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Surface Mount. More details for STL12N60M2 can be seen below.