The DF04S-E3/77: The Vishay DF04S-/77 is a single-phase bridge rectifier rated for 400 V peak reverse voltage and 1 A average rectified output current — the two numbers that decide whether it handles the AC line and the load in your power supply front end. Reverse leakage is 5 µA at the 400 V peak — low enough that it won't affect standby power in a lightly loaded supply, but worth checking if the design runs near the voltage ceiling at elevated temperature where leakage climbs.
RoHS3 compliant — no exemptions that require special handling for lead-free assembly; the standard reflow profile for the DFS package works with SAC305 solder.