The ES3400A from Hunan Jingxin Microelectronics is a MOSFET with Continous Drain Current 4.6 to 5.8 A, Drain Source Resistance 21 to 51 milli-ohm, Drain Source Breakdown Voltage 30 V, Gate Source Voltage -12 to 12 V, Gate Source Threshold Voltage 0.6 to 1.3 V. Tags: Surface Mount. More details for ES3400A can be seen below.