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ATMEGA328P-AU

8-bit AVR picoPower MCU, 32KB Flash, 2KB SRAM, 23 I/O, 8ch 10-bit ADC, TQFP-32, Arduino Uno MCU

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Manufacturer Part：

ATMEGA328P-AU

Package：

TQFP-32 (7.0 x 7.0 x 1.05mm)

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Description

Product Overview

The ATMEGA328P-AU from Microchip Technology is a high-performance 8-bit picoPower AVR RISC microcontroller in a 32-pin TQFP package. It features 32KB ISP Flash, 2KB SRAM, 1KB EEPROM, 23 I/O pins, 8-channel 10-bit ADC, 6 PWM channels, and operates from 1.8V to 5.5V at up to 20MHz. This is the MCU at the heart of the Arduino Uno.

Key Specifications

Core AVR (8-bit RISC)
Max Frequency 20MHz (20 MIPS)
Program Memory 32KB ISP Flash (read-while-write)
Data SRAM 2KB
Data EEPROM 1KB
I/O Pins 23
ADC 8-channel 10-bit (TQFP/QFN)
PWM Channels 6
Timers 2 x 8-bit, 1 x 16-bit
Serial Interfaces USART, SPI, I2C (TWI)
Watchdog Timer Yes (separate oscillator)
Analog Comparator 1
Supply Voltage 1.8V to 5.5V
Package TQFP-32 (7 x 7mm)
Operating Temperature -40°C to +85°C
Life Cycle NRND (Not Recommended for New Designs)

Features

  • 131 instructions, most single-clock-cycle execution
  • 32 x 8-bit general purpose working registers
  • 32KB ISP Flash with 10K write/erase cycles
  • 1KB EEPROM with 100K write/erase cycles
  • 2KB SRAM with direct ALU access
  • picoPower technology for ultra-low power consumption
  • Six software-selectable power-saving modes
  • Programmable serial USART with frame error detection
  • Master/Slave SPI serial interface
  • Byte-oriented 2-wire serial interface (I2C compatible)
  • Capacitive touch sensing (16 channels)
  • Temperature sensor

Applications

  • Arduino Uno and compatible boards
  • IoT sensor nodes and gateways
  • Consumer electronics and remote controls
  • Industrial automation and control
  • Battery-powered portable instruments

The ATMEGA328P-AU from Microchip Technology is the iconic 8-bit AVR microcontroller at the heart of the Arduino Uno, packaged in a 32-pin TQFP. Based on the AVR enhanced RISC architecture executing 131 instructions with most in a single clock cycle, it achieves up to 20 MIPS at 20MHz. It integrates 32KB ISP Flash with read-while-write capability, 2KB SRAM, and 1KB EEPROM. The picoPower technology enables ultra-low power consumption across six sleep modes, while 23 I/O pins provide access to 8-channel 10-bit ADC, 6 PWM channels, USART, SPI, and I2C interfaces. The device operates from 1.8V to 5.5V. Note: This device is NRND; ATMEGA328PB-AU is recommended for new designs.

The ATMEGA328P uses the AVR enhanced RISC architecture with a 2-stage pipeline and Harvard bus structure, allowing most instructions to execute in a single clock cycle. The 32 general-purpose working registers are directly connected to the ALU, enabling two independent registers to be accessed in one instruction. The Flash memory supports In-System Programming (ISP) and read-while-write operation through a boot loader section. The picoPower technology minimizes power consumption through clock gating, sleep modes (Idle, ADC Noise Reduction, Power-save, Power-down, Standby, Extended Standby), and a brown-out detector that can be disabled in software. The 16-bit Timer/Counter with input capture and output compare supports precise PWM generation for motor control and audio.

Pin Name Type Function
1-3 PD3-PD1 I/O Port D / INT1 / OC2B / TXD
4 PD0/RXD I/O Port D / INT0 / RXD
5-6 PD4, VCC I/O/Power Port D / XCK / Supply
7 GND Power Ground
8-9 PB6-PB7 I/O Port B / XTAL1-XTAL2 / TOSC1-2
10-17 PB5-PB0 I/O Port B / SCK/MISO/MOSI/SS / OC1A-1B/OC0A-0B
18-19 AVCC, AREF Power/Analog Analog supply / ADC reference
20-25 PC0-PC5 I/O Port C / ADC0-5 / SDA/SCL
26-28 PC6, PD7, PD6 I/O RESET / OC0A / OC0B
29-32 PD5-PD2 I/O Port D / OC0B / OC0A / INT0
  • Arduino Uno and compatible development boards
  • IoT sensor nodes with ultra-low-power sleep modes
  • Custom embedded control systems with Arduino ecosystem
  • Battery-powered data loggers with 1.8V minimum supply
  • Capacitive touch user interfaces for consumer devices
Manufacturer Part Number Package Notes
Microchip ATMEGA328PB-AU TQFP-32 Recommended replacement: 2nd USART, 2nd SPI, 2nd I2C
Microchip ATMEGA328-AUR TQFP-32 Same device, tape & reel packaging
Microchip ATMEGA328P-PU PDIP-28 DIP version for through-hole prototyping
ST STM32F103C8T6 LQFP-48 32-bit Cortex-M3, 72MHz upgrade path
Espressif ESP32-WROOM-32 Module Wi-Fi + BLE, dual-core 240MHz
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Quality Assurance

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Shipping & Payment

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Service & Packaging

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

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