The 36F0503S-1WR2 from Ideal Power Ltd is a DC to DC Converter with Input Voltage 4.5 to 5.5 V, Output Voltage 1 3.3 V, Output Current 1 30 to 303 mA, Output Power 1000 mW, Isolation Voltage 3000 V. Tags: Through Hole, Buck/Step down. More details for 36F0503S-1WR2 can be seen below.