PSRR at 120 Hz — filtering rectified mains ripple
The L78L33CD-TR: 49 dB PSRR at 120 Hz means the output attenuates full-wave-rectified mains ripple by roughly a factor of 280. Protection covers over-current, over-temperature, and short-circuit — the regulator survives a sustained output short without latching or damaging the pass transistor.
Package and board-fit — 8-SOIC footprint
Surface-mount 8-SOIC (0.154" body width, 3.90 mm), 1.27 mm pitch — a standard footprint that routes on two-layer boards without via congestion. The supplier device package is 8-SOIC. Operating temperature range is 0 °C to 125 °C — the low end limits it to commercial/industrial ambient (not -40 °C cold-crank), but the 125 °C ceiling covers hot enclosures and self-heating at full load.
Sourcing — active part, quoted to order
Active lifecycle status from STMicroelectronics.