The US5U1 from ROHM Semiconductor is a MOSFET with Continous Drain Current -1.5 to 1.5 A, Drain Source Resistance 170 to 340 milliohm, Drain Source Breakdown Voltage 30 V, Gate Source Voltage 12 V, Gate Source Threshold Voltage 0.5 to 1.5 V. Tags: Surface Mount. More details for US5U1 can be seen below.