12V fixed output at 1A — the load budget anchor
The 1V maximum dropout at full load means the input rail must stay above 13V to maintain regulation — budget at least 1.5V headroom for line transients and temperature drift.
66dB PSRR at 120Hz — line-frequency ripple rejection
The 66dB PSRR at 120Hz is the relevant spec for rectified AC supplies: it attenuates the 100/120Hz ripple from a full-wave bridge by a factor of 2000, so a 1Vpp ripple on the input becomes roughly 500µVpp on the output. This makes the part a clean choice for analog supply rails in industrial control or instrumentation where the primary supply is a linear or unregulated rectifier.
Protection set — reduces external supervision
Overcurrent, overtemperature, reverse polarity, and short-circuit protection are all integrated.
No official successor is recorded on this line. For new designs, consider the LM2940 series in the SOT-223 package as a starting point; verify pin compatibility and dropout specs against the 12V fixed variant.