The MEF1S0503SP3C from Murata is a DC to DC Converter with Input Voltage 4.75 to 5.25 V, Output Voltage 1 3.3 V, Output Current 1 303 mA, Output Power 1000 mW, Isolation Voltage 3500 V. Tags: Through Hole, Buck/Step down. More details for MEF1S0503SP3C can be seen below.