The YJS4438A from Yangjie Electronic Technology is a MOSFET with Continous Drain Current 8.2 A, Drain Source Resistance 14.5 to 34 milliohm, Drain Source Breakdown Voltage 60 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1 to 2.5 V. Tags: Surface Mount. More details for YJS4438A can be seen below.