Adjustable LDO with 75 dB PSRR — TO-220
The LD1117V is an adjustable positive LDO regulator from the ST LD1117 family, delivering up to 800 mA with a dropout voltage of 1.2 V max at full load. Its 75 dB PSRR at 120 Hz means it attenuates 60 Hz / 120 Hz rectifier ripple by a factor of ~5600 — relevant for powering analog front-ends where supply noise couples into the signal chain.
Output range and protection — 1.25 V to 15 V
The adjustable output spans 1.25 V to 15 V, set by two external resistors. Quiescent current is 5 mA typical, and the part includes over-current and over-temperature protection. Input voltage max is 15 V, so budget headroom above the dropout for regulation.
STMicroelectronics lists the LD1117V as Obsolete. For BOM positions that need this exact order code, the procurement path is through independent distribution — we can source and quote to order against your quantity. The TO-220-3 package and through-hole mounting are standard, so the footprint is well known.