LDL1117S33R

LDL1117S33R is the tape-and-reel SOT-223 ordering code for the STMicroelectronics LDL1117 low-dropout regulator, fixed 3.3 V variant: the ST datasheet ordering table (DS12022 Rev 7) maps the LL33 device marking to this exact code and output voltage, and the LDL1117 series is a current ST product line. It accepts an input from 2.5 V to 18 V, guarantees 1.2 A of output current, shows a dropout voltage of 350 mV typical and 600 mV maximum at 1.2 A, power-supply rejection of 87 dB typical at 120 Hz and still above 40 dB at 100 kHz, and quiescent current of 250 µA typical and 500 µA maximum, over -40 °C to +125 °C. The selection point is a modern 1.2 A LDO in the familiar SOT-223 footprint: embedded and industrial 3.3 V rails get a full-ampere-class regulator with documented dropout and PSRR instead of a legacy 1117-era part. Selection advice: do not confuse this code with the older LD1117 family - that is a different, 800 mA device with roughly 1 V of dropout, and the two are not parameter equivalents even where the footprint matches. Parameters verified against the ST LDL1117 datasheet DS12022 Rev 7 (ordering information and electrical characteristics).