Question

What is the maximum input voltage of LM317?

Answer 1

testing lm317t

this IC has 3 pins and a heatsink connected to the middle pin too. this pin is the output voltage. if you look to the ic, the legs towards you, the right one is the input pin. you must see a difference of minimum 1.2V between the two pins, otherwise the IC is faulty.Dec 6, 2005

How to Test the IC LM317T Using Multimeter? | Forum for Electronics

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Search for: How do I know if my LM317 is working?

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Specifications

Symbol	Parameter	Value
Vin \u2013 Vout	Voltage differential	3 \u2013 40
TJ	Operating junction temperature range	0 \u2013 125
IO(MAX)	Maximum output current	1.5
IL(MIN)	Minimum load current	3.5 mA typical, 12 mA maximum

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LM317 - Wikipedia

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https://en.wikipedia.org \u203a wiki \u203a LM317

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Description. The LM317 is an adjustable voltage linear regulator that can output 1.25 \u2013 37V at up to 1.5A current with an input voltage range of 3 \u2013 40V.