ESP8266 Community Forum

- Mon May 02, 2016 6:42 am #46678 Hi,
I am planing to do a home-automation project with aformentioned board. I was just wondering how much current can you draw from 3.3V pins and Vin pin on this board for longer periods of time without damaging the board? I only found that you can draw max 12mA per GPIO pin, but nothing about max current on 3,3V pin or Vin pin.
Thanks for your help!

- Fri Jun 30, 2017 1:44 pm #67776 up! I need to know too!

Maybe the maximum current is from the voltage regulator, but also wanted to know the maximum of each 3.3v pin

- Fri Jun 30, 2017 8:22 pm #67783 Did you look at the specifications that Espressif publishes on the ESP8266 ? Or the FAQ or design guides?

- Sat Jul 01, 2017 3:49 am #67789 1. Pin Vin 5V is input for your power source, its not primary output. It is connected via diode with 5V USB. Can give the same current as your USB source.
2. Maximal output current from 3V3 pin is formula Imax = (1000mA - total current for ESP8266 chip), But you must first supply this current to Vin pin from power source or from USB.
ESP8266 operating current average value = 80mA
Maximal output current from one GPIO pin is 12mA
Total current for ESP8266 chip is sum of operating and GPIOs currents