ATmega328P
Popular 8-bit AVR MCU with 32KB Flash, 2KB SRAM, and 1KB EEPROM. Widely used in Arduino Uno and educational projects.
Product Overview
Description
The ATmega328P is one of the most popular 8-bit microcontrollers, best known as the heart of the Arduino Uno. It features 32KB of in-system programmable Flash, 2KB of SRAM, and 1KB of EEPROM.
Operating at up to 20MHz, this MCU provides sufficient performance for a wide range of embedded applications. The rich peripheral set includes 23 GPIO pins, 6-channel 10-bit ADC, UART, SPI, and I2C interfaces.
With its low power consumption and wide operating voltage range (1.8V-5.5V), the ATmega328P is ideal for battery-powered applications, educational projects, and cost-sensitive designs.
Product Series
ATmega
Primary Application
Arduino and maker projects
Key Features
- 32KB in-system programmable Flash
- 2KB SRAM and 1KB EEPROM
- 23 programmable GPIO pins
- 6-channel 10-bit ADC
- UART, SPI, and I2C interfaces
- Low power consumption
- Wide voltage range 1.8V-5.5V
- Arduino compatible
Specifications
| Architecture | 8-bit AVR |
|---|---|
| Flash Memory | 32KB |
| RAM | 2KB SRAM |
| EEPROM | 1KB |
| Max Frequency | 20MHz |
| GPIO | 23 pins |
| ADC | 10-bit, 6 channels |
| Operating Voltage | 1.8V - 5.5V |
| Package | DIP-28, TQFP-32, QFN-32 |
| Temperature Range | -40°C to +85°C (Industrial) |
Applications
Arduino and maker projects
Electronic system design
Educational development
Electronic system design
Battery-powered devices
Battery and charging management
Simple control systems
Industrial automation and control
Sensor interfaces
Sensor signal conditioning
Low-cost embedded designs
Electronic system design
FAE Expert Insights
"The ATmega328P is the workhorse of the maker community. Its popularity stems from the Arduino ecosystem, but it's a capable MCU in its own right. I recommend it for educational projects, simple control applications, and when Arduino compatibility is needed. The DIP package is perfect for breadboarding and learning. For production designs, consider the TQFP or QFN packages for smaller footprint."
Arduino-compatible with excellent educational resources and community support
— David Lee, BeiLuo
Frequently Asked Questions
What is the difference between ATmega328 and ATmega328P?
The ATmega328P is the picoPower version of the ATmega328. The 'P' indicates lower power consumption through additional power-saving features like the PRR (Power Reduction Register) which allows disabling individual peripherals. The ATmega328P also has a wider operating voltage range (1.8V-5.5V vs 2.7V-5.5V). Both are code-compatible, but the 328P is recommended for all new designs.
Always use ATmega328P for new designs - lower power and wider voltage range at the same price.
Can I use Arduino code on ATmega328P without Arduino board?
Yes, you can program the ATmega328P directly using the Arduino IDE and a programmer like USBasp or Arduino as ISP. Select 'ATmega328P' as the board and use 'Upload Using Programmer' option. You'll need to configure the fuses for the desired clock source (internal 8MHz or external crystal). The Arduino bootloader is not required for this approach, saving 2KB of Flash memory.
Use direct programming to save bootloader space and reduce cost for production designs.