Datasheet for the LM117/LM317A/LM317 3‑terminal adjustable positive voltage regulators covering specs, packages and application notes.
The LM117 series of adjustable 3‑terminal positive voltage regulators provides up to 1.5 A output over a 1.2 V to 37 V range. They require only two external resistors to set the output voltage and include built‑in current limit, thermal overload and safe‑area protection. The devices are offered in a variety of TO‑3, TO‑220, TO‑263, SOT‑223, TO‑39, TO‑252 and LCC packages.
The datasheet details absolute maximum ratings, electrical characteristics, typical performance curves and application hints such as recommended input and output capacitors, ripple‑rejection techniques, and heatsink calculations. Ordering information and package markings are also provided.
| Maximum output current | 1.5 A |
|---|---|
| Line regulation (LM317A) | 0.01 %/V |
| Load regulation (LM117) | 0.3 % |
| Ripple rejection | 80 dB |
| Input‑output voltage differential (max) | +40 V |
| Operating temperature range (LM117) | -55 °C to +150 °C |
A 0.1 µF disc or 1 µF solid‑tantalum capacitor on the input is suitable for most applications.
A heatsink may be needed if the calculated thermal resistance exceeds the package rating, based on power dissipation and ambient temperature.