300 mA LDO for noise-sensitive 3.3 V rails
The MIC5318-3.3YD5-TR is a single-output, positive-voltage LDO regulator from Microchip Technology delivering a fixed 3.3 V output at up to 300 mA. Power-supply rejection ratio (PSRR) is specified at 75 dB at 1 kHz, rolling off to 55 dB at 20 kHz. This makes the part a strong candidate for powering analog front-ends, sensor bias circuits, or RF local oscillators where upstream switching noise must be attenuated before reaching the load.
Package, temperature grade, and protection
Housed in a TSOT-23-5 package (also referred to as SOT-23-5 Thin), the device occupies minimal board area — suitable for compact handheld or sensor-module designs. The surface-mount footprint mates with standard TSOT-23-5 land patterns; the exposed pad (if present on the variant) aids thermal transfer to the PCB copper plane. On-chip protection includes over-current and over-temperature shutdown, preventing damage under fault conditions or excessive ambient heat. Quiescent current is 150 µA typical — moderate for a 300 mA LDO, but worth budgeting in battery-powered designs where the regulator's own draw competes with the load during sleep modes.