The L78L05ACD13TR: The 8-SOIC package suits surface-mount assembly on mixed-signal boards where a clean 5 V rail is needed for analog or digital loads. Input voltage tolerance extends to 30 V maximum, giving headroom for unregulated or lightly regulated supplies such as a 9 V or 12 V rail before the dropout region. Quiescent current is 5.5 mA typical, which is moderate for a 100 mA LDO — the trade-off is lower dropout versus a micropower part.
PSRR and protection suite
Power supply rejection ratio is 49 dB at 120 Hz, meaning ripple on the input at mains frequency is attenuated by a factor of roughly 280. For a board powered from a rectified AC source, this keeps the 100/120 Hz ripple from coupling into the 5 V rail that feeds an ADC or op-amp front end. On-chip protection covers over-current, over-temperature, and short-circuit conditions — the regulator folds back or shuts down rather than letting the pass transistor exceed its safe operating area. This makes the L78L05ACD13TR a robust choice for a general-purpose 5 V rail that might see transient overloads during power-up or fault conditions.