5V fixed rail in a TO-220-3 — the through-hole workhorse
It comes in a TO-220-3 through-hole package, making it a straightforward drop-in for board-level 5V rails where a heatsink tab and manual assembly are preferred over surface-mount.
Dropout and headroom — what the 1V max at 50 mA means
The maximum dropout voltage is 1V at 50 mA output. For a 5V rail, that means the input must stay above 6V to maintain regulation under light load — a 7.5V or 9V unregulated supply is a typical match. At full 500 mA load, expect the dropout to rise; the datasheet curve shows the trade-off.
Protection set — over-temp, reverse polarity, short circuit
Built-in protection features include over-temperature shutdown, reverse polarity protection, and short-circuit current limiting. These reduce the need for external clamp diodes or foldback circuits on the 5V rail, simplifying the BOM for industrial or automotive-grade designs.