Regulator identity and output capability
The LM317LCD is a 100 mA adjustable positive linear regulator from Texas Instruments, housed in an 8-SOIC surface-mount package (0.154-inch body width). 100 mA is the headline rating—drive a clean analog rail or a low-power MCU from it, but stay clear of continuous 100 mA at high input-to-output differential without thermal derating on the 8-SOIC footprint.
Supply range and protection
Maximum input voltage is 38 V, and the output can be adjusted from 1.2 V up to 32 V via two external resistors. Dropout is not explicitly listed, but for a classic three-terminal adjustable regulator expect around 2 V headroom. On-chip protection covers over-current, over-temperature, and short-circuit—useful if the load side faults.
PSRR and quiescent current for analog rails
PSRR runs 80 dB down to 65 dB at 120 Hz—that's enough ripple rejection to feed a low-noise op-amp supply from a noisy pre-regulator. Quiescent current is 2.5 mA typical; that's the self-consumption when the output is lightly loaded, so budget it into the overall efficiency for battery-powered designs.
Temperature range and sourcing posture
Operating temperature is 0 °C to 125 °C—commercial-to-hot, fine for indoor and many industrial enclosures.