The ESD508 from Hunan Jingxin Microelectronics is a MOSFET with Continous Drain Current 57 to 73 A, Drain Source Resistance 3.5 to 4.5 milli-ohm, Drain Source Breakdown Voltage 30 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 2.0 to 3.5 V. Tags: Surface Mount. More details for ESD508 can be seen below.