The ES138K from Hunan Jingxin Microelectronics is a MOSFET with Continous Drain Current 0.41 A, Drain Source Resistance 0.96 to 4.5 ohm, Drain Source Breakdown Voltage 60 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 0.8 to 1.5 V. Tags: Surface Mount. More details for ES138K can be seen below.