ATmega328 Microcontroller with Arduino UNO Bootloader
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Prices updated: 13 Oct 2026
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About this product
An 8-bit AVR microcontroller pre-loaded with the Arduino UNO bootloader, so it can be programmed from the Arduino IDE over a USB-to-serial adapter once it has a clock source and power. It is used in standalone Arduino-compatible projects or as a replacement chip for an Arduino UNO board.
Specifications
- Architecture
- 8-bit AVR
- Flash memory
- 32 KB
- SRAM
- 2 KB
- EEPROM
- 1 KB
- Operating voltage
- 1.8 V to 5.5 V
- Bootloader
- Arduino UNO
Frequently asked questions
How do I program it?
Wire the chip with power, a 16 MHz clock source and a USB-to-serial adapter on the TX and RX pins. Then select Arduino UNO in the Arduino IDE and upload through the serial port.
Can it replace the chip on an Arduino UNO?
Yes, it is commonly used as a replacement for the main chip on an Arduino UNO. Insert it with the correct orientation, and make sure the board runs at 16 MHz, which is the UNO clock.
