ATmega328 Developer Atmel Operating voltage 1.8V to 5.5V Max Operating frequency 20 MHz Temp. range -40°C to 85°C CPUs Data bus width 8-bit Core AVR FPU No Pins Pin count 32 Max I/O Pins 23 Memory Flash 32KB SRAM 2KB EEPROM 1024B Packaging Package PDIP-28, VQFN-28, QFN-32, TQFP-32, MLF-32 Mounting SMD/SMT, Through Hole

The ATmega328 is an 8-bit, 32KB Flash, microcontroller, part of the megaAVR MCUs series, developed by Atmel. The microcontroller provides a delicate balance between performance and balance. The microcontroller came into notability when it was selected to be the microcontroller of choice in the Arduino single-board microcontroller.

The ATmega328P is a picoPower microcontroller version of the ATmega328.

Models

Model Code	Package	Terminal Count
ATMEGA328-AU	TQFP	32
ATMEGA328-AUR	TQFP	32
ATMEGA328-MU	MLF	32
ATMEGA328-MUR	MLF	32
ATMEGA328-PU	PDIP	28