Adjustable LDO for post-regulation — 800 mA, DPAK
It delivers up to 800 mA output current with a maximum dropout voltage of 1.2 V at full load. A single internal regulator — one channel, positive output only. The 75 dB power-supply rejection ratio at 120 Hz tells you this part is designed to clean up the 100/120 Hz ripple from a full-wave rectified mains supply — common in appliance PSUs, industrial control boards, and office equipment where the raw DC rail comes from a line-frequency transformer and capacitor. Built-in over-current and over-temperature protection are included — the part folds back or shuts down rather than letting the junction run away under a sustained overload or a shorted output.
Dropout and headroom — what the 1.2 V max means for your rail
The 1.2 V dropout at 800 mA is the worst-case voltage difference between input and output needed to maintain regulation. If your input is a 5 V ±5 % rail, that is 4.75 V minimum — still above the dropout ceiling, but with only 250 mV of margin. A 5 V ±10 % rail at 4.5 V min sits right at the dropout boundary; you would need a lower-dropout part or a tighter input tolerance. The 5 mA quiescent current is the current the regulator consumes to run its internal bias — it flows to ground regardless of load. In a battery-powered design drawing microamps in sleep, 5 mA is too high; this part is sized for always-on line-powered circuits, not energy-harvesting or portable gear.
0°C to 125°C — indoor temperature grade only
It will not start reliably below freezing — do not use it in outdoor telecom cabinets, automotive under-hood, or cold-storage applications without a heated enclosure.
There is no announced end-of-life, no last-time-buy window, and no forced redesign. The DPAK package is widely stocked and the part number is a common cross-reference target.