National Semiconductor LM117/LM317A/LM317 3-Terminal Adjustable Regulator Datasheet

This datasheet details the features, specifications, and applications of the LM117 series adjustable positive voltage regulators.


National Semiconductor LM117/LM317A/LM317 3-Terminal Adjustable Regulator Datasheet - cover page
Brand
National Semiconductor
Document type
Datasheet
Language
English
Pages
26
File format
PDF
File size
1002 KB
Published
16 October, 2026
Updated
16 October, 2026
MD5 checksum
B84A8C5EC4B237EEB12492FC105AAEBA

About this manual

The LM117 series of adjustable 3-terminal positive voltage regulators is capable of supplying in excess of 1.5A over a 1.2V to 37V output range. They are exceptionally easy to use and require only two external resistors to set the output voltage, offering better line and load regulation than standard fixed regulators.

What's inside

  • General Description
  • Features
  • Typical Applications
  • Package Options
  • Absolute Maximum Ratings
  • Electrical Characteristics
  • Connection Diagrams

Specifications

Output Current (LM117, LM317)1.5A
Output Voltage Range1.2V to 37V
Line Regulation (LM317A)0.01%/V Typ
Ripple Rejection Ratio80 dB

Frequently asked questions

How many external resistors are needed to set the output voltage?

The device requires only two external resistors to set the output voltage.

What is the guaranteed output voltage tolerance for the LM317A?

The guaranteed output voltage tolerance is 1%.

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