The TDR 3-4812SM from Traco Power is a DC to DC Converter with Input Voltage 36 to 75 V, Output Voltage 1 12 V, Output Current 1 0.25 A, Output Power 3 W, Isolation Voltage 1.6 kV. Tags: Surface Mount, Buck/Step down. More details for TDR 3-4812SM can be seen below.