The LM2931CMX/NOPB is a positive adjustable LDO regulator from Texas Instruments, delivering up to 100 mA with a maximum dropout of 0.3 V at full load. Its 55 dB PSRR at 120 Hz means the output attenuates mains-frequency ripple by a factor of about 560 — relevant for powering analog front-ends or sensor supplies in industrial control and automotive body electronics where the input rail carries alternator or switching-regulator hash.
26 V input ceiling and adjustable output
Rated for input voltages up to 26 V, this part fits 24 V nominal industrial buses and automotive 12 V systems with load-dump transients clamped below the maximum. A single regulator in an SOIC-8 footprint covers a wide range of post-regulation voltages without swapping the BOM.
Protection set that simplifies the board
On-chip protection includes over-temperature shutdown, reverse polarity protection, and short-circuit current limiting. These three features eliminate the need for external clamp diodes, a crowbar circuit, or a separate thermal switch in most designs — the regulator handles fault conditions internally.
Listed as active in production.