3.3V fixed LDO with 65dB PSRR — what that means for your rail
The BU33TA2WHFV-TR is a fixed-output 3.3V LDO regulator from ROHM, delivering 200mA continuous current from a maximum 5.5V input rail. Its 65dB PSRR at 1kHz means the regulator attenuates input ripple by a factor of roughly 1800 — a 100mVpp switching noise on the input rail appears as about 56µVpp on the output, which keeps downstream analog circuitry clean.
Quiescent current and protection — battery and reliability fit
Quiescent current is 95µA typical — low enough for always-on rails in battery-powered designs, though not an ultra-low-Iq part for years-long standby. Built-in over-current and over-temperature protection means the regulator folds back or shuts down before damaging itself or the load under a fault. The enable pin (Control Features: Enable) lets a GPIO or power-management IC gate the output — useful for sequencing rails or cutting power to a subcircuit in sleep.
Package, temperature grade, and sourcing posture
Housed in the 5-pin SOT-665 (ROHM's 5-HVSOF), a 1.6mm × 1.6mm package with a 0.5mm pitch — the exposed pad on the bottom side must be soldered to a PCB thermal land for the 200mA rating to hold at high ambient.