EmbeddedRelated.com
The 2026 Embedded Online Conference
    Parts    ATMEGA328P-MU
ATMEGA328P-MU

MCHPATMEGA328P-MU

Microchip Technology
QFN/UDIP package option for smaller SMT footprints.
Active5,629 in stock
Datasheet Digi-Key Compare Prices

Overview

The ATMEGA328P-MU is an 8-bit AVR microcontroller from Microchip Technology, offered in a compact 32-pin VFQFN (QFN) package. It features 32KB of In-system Self-Programmable Flash memory, 2KB of SRAM, and 1KB of EEPROM. This MCU operates at up to 16MHz and includes a range of peripherals for embedded applications.

Why Choose This Part

Engineers benefit from the ATMEGA328P-MU's established AVR ecosystem, offering extensive tool support and community resources. Its compact QFN package is beneficial for modern designs requiring smaller footprints. The balanced integration of Flash, SRAM, and EEPROM, along with essential peripherals, provides a versatile platform for many embedded projects.

Applications

General Purpose Embedded Systems
Suitable for a wide array of embedded control tasks due to its balanced feature set, robust AVR core, and moderate memory resources.
Sensor Interfacing and Data Logging
The integrated ADC, EEPROM, and communication interfaces like I2C and SPI make it well-suited for reading sensor data and logging it.
Small Form-Factor Control Modules
Its 32-pin VFQFN package (5x5mm) allows for compact PCB designs, making it ideal for space-constrained applications.
Battery-Powered Devices
With a shutdown current of 1uA and various low-power modes, it is a viable option for applications requiring energy efficiency.

Key Specifications

Speed 20MHz
RAM Size 2K x 8
Core Size 8-Bit
EEPROM Size 1K x 8
Peripherals Brown-out Detect/Reset, POR, PWM, WDT
Connectivity I2C, SPI, UART/USART
Mounting Type Surface Mount
Number of I/O 23
Core Processor AVR
Package / Case 32-VFQFN Exposed Pad
Data Converters A/D 8x10b
Oscillator Type Internal
Program Memory Size 32KB (16K x 16)
Program Memory Type FLASH
Operating Temperature -40degC ~ 85degC (TA)
Supplier Device Package 32-VQFN (5x5)
Voltage - Supply (Vcc/Vdd) 1.8V ~ 5.5V

Getting Started

To get started with the ATMEGA328P-MU, utilize Microchip Studio (formerly Atmel Studio) for development and programming. The Atmel-ICE programmer/debugger is a common tool for debugging and flashing AVR microcontrollers. Several development boards, including many Arduino-compatible platforms, use variants of the ATMEGA328P, providing accessible prototyping options.

ATMEGA328P Family

Comparing specs that differ across variants. The current part is highlighted.

Part Number I/O Pins Stock
ATMEGA328P-MU (this part) 23 5,629
ATmega328P 27 13,074
Also available as: ATMEGA328P-AUR, ATMEGA328P-PU, ATMEGA328P-AU

Also Consider

ATMEGA328P-AU MCHPMicrochip Technology - This is a similar ATMEGA328P variant in a TQFP package, which might be easier for hand soldering or specific PCB routing constraints.
ATMEGA328PB-AU MCHPMicrochip Technology - The ATMEGA328PB offers more peripherals and improved power efficiency while maintaining pin compatibility with some ATMEGA328P variants.
The 2026 Embedded Online Conference