The BA33BC0WFP-E2: The BA33BC0WFP-: The ROHM BA33BC0WFP- is a single-output positive linear regulator delivering a fixed 3.3 V at up to 1 A. It is built for surface-mount assembly in the TO-252-5 (DPak) package, with the tab providing a thermal path to the board. The 55 dB PSRR at 120 Hz tells you this part handles rectified-ripple rejection from a mains-derived supply — useful when the input comes from a bulk capacitor after a bridge rectifier or a flyback converter running at line frequency. The quiescent current sits at 0.5 mA, which keeps the standing loss low in always-on rails.
Industrial temperature and protection — where this part lives
The over-current and over-temperature protection are built in — no external watchdog needed for basic fault survival. Maximum input voltage is 16 V, so it tolerates a 12 V nominal rail with headroom for transients.
Enable pin — sequencing without extra logic
The control feature is an enable pin, letting you sequence this rail on and off with a logic signal. That saves a discrete load switch or a supervisor IC when the system needs a delayed power-up or a shutdown sequence for a microcontroller or analog front end.
Package and rework — TO-252-5 with tab
The TO-252-5 (DPak) has four leads plus a tab. The tab is the main thermal path — a good via stitch under it keeps the junction temperature under control at 1 A continuous.