The ES3406A from Hunan Jingxin Microelectronics is a MOSFET with Continous Drain Current 3.3 to 4.3 A, Drain Source Resistance 34 to 70 milli-ohm, Drain Source Breakdown Voltage 30 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1.0 to 2.4 V. Tags: Surface Mount. More details for ES3406A can be seen below.