The STL66DN3LLH5 from STMicroelectronics is a MOSFET with Continous Drain Current 14.2 to 78.5 A, Drain Source Resistance 5.9 to 7.9 milliohm, Drain Source Breakdown Voltage 30 V, Gate Source Voltage 22 V, Gate Source Threshold Voltage 1 to 3 V. Tags: Surface Mount. More details for STL66DN3LLH5 can be seen below.