The RW4C045BC from ROHM Semiconductor is a MOSFET with Continous Drain Current -4.5 to 4.5 A, Drain Source Resistance 39 to 117 Milliohm, Drain Source Breakdown Voltage -20 V, Gate Source Voltage -8 to 8 V, Gate Source Threshold Voltage -1.5 to -0.5 V. Tags: Surface Mount. More details for RW4C045BC can be seen below.