The B78E03-0R5 from Pulse Electronics is a DC to DC Converter with Input Voltage 6 to 30 V, Output Voltage 1 3.3 V, Output Current 1 0 to 500 mA, Output Power 1.6 to 24 W, Operating Temperature -40 to 85 Degree C. Tags: Through Hole, Buck/Step down. More details for B78E03-0R5 can be seen below.