The RW4E045AT from ROHM Semiconductor is a MOSFET with Continous Drain Current -4.5 to 4.5 A, Drain Source Resistance 34 to 70 Milliohm, Drain Source Breakdown Voltage -30 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage -2.5 to -1 V. Tags: Surface Mount. More details for RW4E045AT can be seen below.