The 7803SR-C from Murata is a DC to DC Converter with Input Voltage 7.5 to 36 V, Output Voltage 1 3.3 V, Output Current 1 500 mA, Isolation Voltage 1000 V, Operating Temperature -40 to 70 Degree C. Tags: Through Hole, Buck/Step down. More details for 7803SR-C can be seen below.