The YJJ3400A from Yangjie Electronic Technology is a MOSFET with Continous Drain Current 5.6 A, Drain Source Resistance 20 to 45 milliohm, Drain Source Breakdown Voltage 30 V, Gate Source Voltage -12 to 12 V, Gate Source Threshold Voltage 0.65 to 1.5 V. Tags: Surface Mount. More details for YJJ3400A can be seen below.