The 12D5.300SMT from Calex Manufacturing is a DC to DC Converter with Input Voltage 9 to 18 V, Output Voltage 1 5 V, Output Current 1 0.3 A, Output Power 3 W, Output Voltage 2 -5 V. Tags: Surface Mount, Buck/Step down. More details for 12D5.300SMT can be seen below.