The 51028120 from Frontgrade Technologies is a DC to DC Converter with Input Voltage 21 to 38 V, Output Voltage 1 1.2 V, Output Current 1 0 to 42 A, Output Power 0 to 50 W, Operating Temperature -55 to 125 Degree C. Tags: Surface Mount, Buck/Step down. More details for 51028120 can be seen below.