The SMN2H12S3R3 from Calex Manufacturing is a DC to DC Converter with Input Voltage 9 to 18 V, Output Voltage 1 3.3 V, Output Current 1 500 mA, Output Power 2 W, Isolation Voltage 1.5 kV. Tags: Surface Mount, Buck/Step down. More details for SMN2H12S3R3 can be seen below.