The ES3139KZ from Hunan Jingxin Microelectronics is a MOSFET with Continous Drain Current -0.4 to -0.5 A, Drain Source Resistance 580 to 2000 milli-ohm, Drain Source Breakdown Voltage -20 V, Gate Source Voltage -12 to 12 V, Gate Source Threshold Voltage -0.35 to -1.2 V. Tags: Surface Mount. More details for ES3139KZ can be seen below.