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I am concerned whether I need to use a voltage divider to power my ESP8266 module. My concerns stem from the warnings that I have heard in multiple tutorials. Everyone seems to regard the ESP8266 as being very sensitive to supply voltage.

Has anyone use the ESP8266 with an supply voltage greater than 3.5 V? What were the effects? Is it even necessary to make a voltage divider?

I am asking because my application has limited real estate.

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    Surely you mean 3.3V :) – Code Gorilla Jan 9 '18 at 15:22
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    Some of the pins on ESPs are protected against excessive voltage, personally I always err on the side of caution and use regulators and level shifters, but with the real estate restrictions I'd suggest you check the manual on what the absolute maximum is that you version of the board can take. – Code Gorilla Jan 9 '18 at 15:24
  • Are you talking about providing power to the ESP, or just an input-pin? For power use a voltage regulator. For inputs you could indeed use a voltage divider. – Gerben Jan 9 '18 at 16:37
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    To be clear I was talking about the power input. – Evan Gertis Jan 9 '18 at 16:47
  • you cannot power an ESP from a voltage divider because it's current is not steady. – dandavis Jan 12 '18 at 20:39
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The datasheet usually is definitive on the allowable range of voltages.

Look in Section 5.1: Electrical Characteristics.

Working Voltage Value:

  • Min: 2.5 V
  • Typical: 3.3 V
  • Max: 3.6 V

If you have to feed in signals that could go higher than 3.3 V in normal operation, you need to either clamp it with Zener diodes, or use a voltage divider.

If you are asking about powering the chip with more than 3.3 V, don't. You can get away with a 3.3 V linear regulator and 2 capacitors so that you are powering it with no more than designed supply voltage.

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If your voltage source is high enough, spend less than a buck on a regulator like a LD1117-3.3

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The result to apply more voltage to a circuit is that the components will be burn. The same if you apply for a long time the maximum voltage. So the board works at 3.3v, your source maybe fluct between that but you will burn it if you apply 3.6 or more as a regular voltage.

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