The STD52P3LLH6 from STMicroelectronics is a MOSFET with Continous Drain Current 52 A, Drain Source Resistance 10 to 17 Milliohm, Drain Source Breakdown Voltage 30 A, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1 to 2.5 V. Tags: Surface Mount. More details for STD52P3LLH6 can be seen below.