The STL125N8F7AG from STMicroelectronics is a MOSFET with Continous Drain Current 120 A, Drain Source Resistance 3.6 to 4.5 Milliohm, Drain Source Breakdown Voltage 80 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 2.5 to 4.5 V. Tags: Surface Mount. More details for STL125N8F7AG can be seen below.