The ES4803A from Hunan Jingxin Microelectronics is a MOSFET with Continous Drain Current -4.5 to -5.8 A, Drain Source Resistance 39 to 80 milli-ohm, Drain Source Breakdown Voltage -30 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage -1.0 to -2.0 V. Tags: Surface Mount. More details for ES4803A can be seen below.