The STL56N3LLH5 from STMicroelectronics is a MOSFET with Continous Drain Current 10 to 56 A, Drain Source Resistance 7.6 to 11.2 milliohm, Drain Source Breakdown Voltage 30 V, Gate Source Voltage 22 V, Gate Source Threshold Voltage 1 to 2.5 V. Tags: Surface Mount. More details for STL56N3LLH5 can be seen below.