For a BOM that calls out this part, procurement moves to the independent market — surplus inventory, broker stock, or last-time-buy remnants.
10 µA quiescent current — the battery-life spec
The TPS61121RSARG4 draws just 10 µA from the supply in operation. That quiescent current is the headline number for a handheld or mobile device where every microamp extends battery run time. The part is a DC-DC converter intended for power management in portable gear — think feature phones, media players, handheld instruments, and similar battery-powered handheld/mobile devices.
16-QFN with exposed pad — hand-solderable?
The package is a 16-VQFN with an exposed pad, measuring 4 mm × 4 mm (supplier device package 16-QFN). For a hobbyist or maker: yes, you can hand-solder a 16-QFN with a fine-tip iron and some flux, but the exposed pad requires either a hot-air station or a reflow oven to get a reliable solder joint underneath.
Temperature range — not just indoor use
That makes it suitable for outdoor handhelds, automotive cabin electronics, or industrial portable tools that see temperature swings. The surface-mount mounting type is standard for modern PCB assembly.