Fixed 1.8V rail with 72dB PSRR — the noise-rejection anchor
The LD29080DT18R is a single-output LDO from STMicroelectronics, fixed at 1.8V and rated for 800mA continuous output. It targets clean supply rails for analog or mixed-signal circuits where the 72dB PSRR at 120Hz keeps ripple off the line — a typical figure for rejecting 100/120Hz mains hum from a rectified front-end.
Dropout and quiescent — sizing the headroom and standby budget
Quiescent current is 180 µA typical — low enough for always-on sub-circuits but not an ultralow-Iq part; the 35 mA supply max suggests a bias current that climbs under fault or heavy load. The -40°C to 125°C operating range covers automotive under-hood and industrial ambient extremes. Protection includes over-current and over-temperature shutdown — the thermal limit is set by the die junction, not the package, so a DPAK pad soldered to a decent copper pour on the PCB is assumed for sustained 800mA at high ambient.
Active production — no LTB clock ticking
STMicroelectronics lists the LD29080DT18R as Active. For new designs or replacement orders, the part is sourced through authorized distribution and quoted per RFQ — lead time and current pricing confirmed at quote.
Package and footprint — DPAK with exposed tab
Supplied in the DPAK (TO-252-3, SC-63) package, surface-mount with two leads plus a center tab. The tab is the thermal path and usually connected to the output or ground depending on layout; the exposed pad requires a soldered copper island on the PCB for rated thermal performance.