R1172D311D-TR-FE

R1172D311D-TR-FE is a 3.1 V fixed-output, 1 A low-voltage LDO regulator from Nisshinbo Micro Devices in the HSON-6 package (2.9 x 2.8 mm), supplied on tape and reel. The 311 code is the 3.1 V step in the R1172 ordering table — a rail value used behind DC/DC converters feeding low-voltage LSIs — and the D code pins the HSON-6 package, distinct from the SOT-23-5 and HSOP-6J variants of the same series. Dropout is 0.18 V maximum at 1 A, ripple rejection is 70 dB at 1 kHz, quiescent current is 100 µA typical, the input withstands 6 V maximum, and a CE enable pin plus thermal shutdown, foldback current limiting and inrush limiting cover sequencing and fault behaviour across -40 °C to +85 °C. Selection advice: quote the full code including the -TR-FE reel suffix, and fix the option letter against the CE configuration your board uses before ordering, because sibling codes differ only in that option. Parameters verified against Nisshinbo Micro Devices documentation.