Active production, 100 mA adjustable regulator in SOIC-8
Output voltage is adjustable from 1.2 V up to 32 V using two external resistors, with a maximum input voltage of 38 V.
PSRR and protection — what they mean for a noise-sensitive rail
PSRR is specified at 80 dB to 65 dB at 120 Hz — this is the ripple rejection a designer gets on a rectified line-frequency supply, useful for powering analog front-ends or low-noise sensor bias where a basic 78xx would pass through 60/120 Hz hum. Built-in protection includes over-current, over-temperature, and short-circuit shutdown — the regulator survives a sustained output short without external clamp diodes in most low-voltage applications. Quiescent current is 2.5 mA typical — not a micropower part, but acceptable for always-on auxiliary rails where the load current is in the tens of milliamps.
The base product number is LM317 — the same die family used in the TO-220 and DPAK variants, so the electrical behaviour is consistent across packages for multi-sourcing strategies.