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LM317T 1.5A 3 Terminal Adjustable Voltage Regulator TO220 Style Case

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Quoting product code: UF27E


About this product


  • Output adjustable between 1.25V and 37V
  • Internal thermal overload protection
  • Internal short circuit current limiting constant with temperature

Product overview

• Output adjustable between 1.25V and 37V• Internal thermal overload protection• Internal short circuit current limiting constant with temperature• Output transistor safe-area compensation• Floating operation for high voltage applications• Eliminates using many fixed voltages• Output voltage with 4% tolerance

The LM317 is an adjustable, positive, 3-terminal voltage regulator capable of supplying 1.5A (Order Code UF27E) over an output voltage range of 1.2V to 37V. This voltage regulator is exceptionally easy to use and requires only 2 external reistors to set the output voltage. Both line and load regulation are better than standard fixed regulators. Full overload protection is included on-chip with current limiting, thermal and safe area protection. This remains fully functional even if the adjustment terminal is disconnected, making it essentially blow-out proof.UF27E is supplied in a TO-220 style case.


Output voltage: 1.2V to 37V
Input/output differential voltage: 40V max.
Operating junction temperature: -20°C to +125°C
Line regulation: 0.01%/V
Load regulation: 0.1%
Adjustment pin current: 50µA
Reference voltage: 1.25V typical
Output noise: 0.003% of Vout
Ripple rejection ratio: 65dB

Recently purchased 4 of these from maplin, could you forward specification sheet to me, want to make sure of the pin out. Am I right in saying that pin 1 is adjust, pin 2 is out and pin 3 is in, looking from the labelled front of case with the tab at the 

Asked by: Rich007
Datasheet for the item is here
Answered by: Les
Date published: 2017-12-12

image shown is of apparently TO92 case but should be TO220 for such current. Assume this is merely an error and that the text is correct. just to confirm i am ordering correct part.

Asked by: Jexxy
Yes, the description of the item is correct, the images are purely for illustration purposes only.
Answered by: James
Date published: 2017-09-11

This regulator could supply the steady-state current for an incandescent lamp of, say, 12V 10W, but would it be able to cope happily with the initial in-rush current?

Asked by: Will
Unfortunately we cannot guarantee compatibility for this item in your intended use
Answered by: Dale
Date published: 2016-12-03

where can I get a data sheet for this item

Asked by: JohnTy
This has been emailed to yourself.
Answered by: Billy
Date published: 2016-09-01

I want to control a 24V dc motor speed from a 24V supply (replacement wire speed control on MIG welder) Can I use a simple rotary potentiometer to replace the two resistors mentioned in the catalogue description for that purpose?

Asked by: Bill H
Unfortunately we are unable to guarantee full compatibility for this item in your intended application, as this is not the manner for which it was designed to be used.
Answered by: Russell
Date published: 2015-09-20
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