Fixed 0.8 V rail for noise-sensitive digital loads
The Texas Instruments TPS7A0508PDBVT is a single-output positive LDO regulator delivering a fixed 0.8 V at up to 200 mA. It is packaged in a SOT-23-5 and rated for junction temperatures from -40°C to 125°C, suiting it for automotive and industrial environments where a clean, low-voltage core rail is needed for FPGAs, SoCs, or microcontrollers. The 40 dB PSRR maintained from 1 kHz through 1 MHz means this regulator rejects switching noise from a downstream DC-DC converter across a wide frequency band, which is the main reason to pick it over a cheaper LDO for an RF or precision analog supply.
Dropout and headroom planning
Quiescent current is 3 µA typical, which keeps the part viable for always-on or battery-backed rails where every microamp counts. The Enable pin lets a system-level power controller shut the rail entirely when the load is idle.
Protection and stability
On-chip protection includes over-current limiting, thermal shutdown, and under-voltage lockout (UVLO). These reduce the need for external supervisory circuits on a production board — the LDO handles its own fault recovery within the rated junction temperature range. The SOT-23-5 package (SOT-753 footprint) is a common small-outline package for linear regulators. Board layout should follow the datasheet's recommended capacitor values for stability.
Sourcing and lifecycle
TI lists the TPS7A0508PDBVT as an active product with ROHS3 compliance. For a current-production LDO in a standard SOT-23-5 package, supply through independent distribution is stable — this is not a part that requires broker sourcing or last-time-buy planning.