The R1M-123.3S/SMD from Recom Power is a DC to DC Converter with Input Voltage 4.5 to 18 V, Output Voltage 1 3.3 V, Output Current 1 0.3 A, Output Power 1 W, Isolation Voltage 1.6 kV. Tags: Surface Mount, Buck/Step down. More details for R1M-123.3S/SMD can be seen below.