The SMW5H48S3R3 from Calex Manufacturing is a DC to DC Converter with Input Voltage 18 to 75 V, Output Voltage 1 3.3 V, Output Current 1 1200 mA, Output Power 5 W, Isolation Voltage 1.5 kV. Tags: Surface Mount, Buck/Step down. More details for SMW5H48S3R3 can be seen below.