The ES4421 from Hunan Jingxin Microelectronics is a MOSFET with Continous Drain Current -5.6 to -7.2 A, Drain Source Resistance 28 to 39 milli-ohm, Drain Source Breakdown Voltage -60 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage -1.1 to -2.1 V. Tags: Surface Mount. More details for ES4421 can be seen below.