The STMicroelectronics LD1117D33 is a positive fixed-output LDO voltage regulator delivering a regulated 3.3V rail from an input up to 15V. The 800mA output current rating defines the load budget — at full load the maximum dropout is 1.2V, so the input rail needs to stay above 4.5V to maintain regulation. The 75dB PSRR at 120Hz makes this part a reasonable choice for cleaning up rectified mains ripple on an analog supply rail.
Package and footprint — 8-SOIC reflow considerations
No moisture sensitivity level is listed, so assume MSL 1 or bake per IPC/JEDEC J-STD-033 if the parts have been stored outside the dry pack.
Protection features and quiescent current
Built-in over-current and over-temperature protection reduce the need for external supervisory circuitry. The quiescent current is 10 mA — this is the current the regulator consumes to run its internal bias, which matters for battery-powered designs where the load spends time in standby. At light loads the 10 mA Iq dominates the efficiency; this part is better suited to always-on line-powered applications than to low-power sleep modes.