The MHFS3123R3 from Cosel is a DC to DC Converter with Input Voltage 4.5 to 18 V, Output Voltage 1 3.3 V, Output Current 1 0.8 A, Output Power 2640 mW, Isolation Voltage 4200 Vdc. Tags: Through Hole, Buck/Step down. More details for MHFS3123R3 can be seen below.