Pro Mini 3.3V/8MHz Arduino Compatible Atmega328P Breakout

Save space & power with this 3.3V version of the Pro Mini Atmega328P Breakout Board! Arduino Compatible so all your Arduino programs will run just the same in a tiny form factor! Includes FTDI header pins for programming instead of a microUSB port like the Pro Micro.

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Availability: SHIPS TODAY

Last Updated: 05/30/2024



This Pro Mini Breakout Board is a great low power alternative to a 5V Pro Mini in your projects. Just solder on the header & programming pins and pop onto a breadboard or solder directly into your projects to save space! Power using a 3.3V-12V power supply and that's it! Wire into your circuit using the pin diagram in the images above and plug into your computer's USB port using the FTDI Cable to program! This version is the 3.3V version which makes it consume less power as well as easier to integrate with other 3.3V devices such as GPS modules, Raspberry Pi, MSP430, etc. The main difference between the Pro Mini and Pro Micro is that the Pro Mini has header pins that require a separate FTDI USB Serial Adapter for programming while the Pro Micro has an onboard microUSB port. We recommend the Pro Micro with onboard USB if you're working on a single project and don't already have the FTDI USB Serial Cable.


  • Our Second Smallest Arduino-Compatible Board! (Smallest is the ATtiny85 Breakout Board with 6 I/O pins)
  • ATmega328P running at 3V/8MHz
  • Supported in the Arduino Programming Software (IDE)
  • FTDI Serial Headers onboard for programming (requires FTDI USB Serial Adapter for programming)
  • Supports Auto-Reset
  • 8 Analog I/O Pins
  • 14 Digital I/O Pins (6 are PWM capable)
  • Rx and Tx Hardware Serial Connections
  • Supports unregulated Power Supplies up to 12V via the RAW pin.
  • Includes Header Pins and Right Angle & Straight Programming Pins (you can use either one)



  • Main Chip: Atmega328P
  • FTDI Serial Headers on board 
  • Input Power Supply: Accepts 3.3V - 12V on the RAW pin for powering the board
  • Operating Voltage: 3.3V (for low power applications)
  • Frequency: 8Mhz
  • Comprable to the Arduino Pro Mini and other Atmega328P Breakouts
  • When Programming via Arduino IDE, be sure to select board type: Arduino Pro Mini (3.3V, 8MHz) w/ ATmega328
  • Max output:150mA
  • Over current protected
  • Reverse polarity protected
  • 3.3V regulator onboard
  • Supports auto-reset
  • Dimensions: 0.7x1.3" (18x33mm)
  • Weight: Less than 2 grams

Initial Setup:

  • Plug your FTDI USB Serial Adapter into your Computer
  • Set the voltage jumper to 3.3V
  • Connect the FTDI USB Serial Adapter to your Pro Mini by matching the pin labels
  • Open the Arduino IDE
  • In the Arduino IDE select Tools->Board->Arduino Pro Mini (3.3V, 8MHz) w/ ATmega328
  • In the Arduino IDE select File-> Examples->01.Basics->Blink
  • Click the Checkmark button on the top menu to verify the Blink code
  • Click the Arrow button to upload to your Pro Mini
  • You should now see your Pro Mini's Red LED blink every second.
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