Shanghai Siproin Microelectronics Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-23. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.
orderable attributes: rebuild .lbr with adom-lbr 2.18.0 so MPN, MANUFACTURER and the distributor part numbers reach <technology> (LCSC_PN C277881). The published library carried no attributes at all, so a BOM had nothing to buy from. Distributor PNs matched on exact MPN AND corroborating manufacturer.