ATmega328PB-AU — 8-Bit AVR Microcontroller | 20MHz, 32KB Flash, TQFP-32
Overview
The ATmega328PB-AU is an enhanced version of the iconic ATmega328P—used in millions of
embedded designs, including Arduino platforms. With more peripherals, additional timers,
expanded serial interfaces, and improved power efficiency, the ATmega328PB delivers powerful
performance in a compact TQFP-32 package.
Featuring 32KB Flash, 2KB SRAM, 20MHz operation, and rich analog/digital I/O, it is ideal for
automation, IoT, motor control, consumer electronics, and industrial applications requiring
long-term reliable performance.
🔧 Ideal for: Embedded systems, Arduino-compatible designs, robotics, automation, IoT nodes & sensor hubs.
Why ATmega328PB-AU?
The ATmega328PB builds upon the proven ATmega328P with more advanced hardware peripherals,
extended serial communication features, and enhanced power-saving modes. With dual USARTs,
dual I²C, more timers, and flexible pin mapping, it enables more complex designs without
increasing code complexity—making it an excellent choice for both hobbyists and professionals.
Key Advantages
- ⚡ 20MHz Max Clock Speed — Robust performance for time-critical applications.
- 📡 Dual USART, Dual I²C, Dual SPI — More communication channels for sensors & modules.
- 🔋 Low-Power Operation — Multiple sleep modes for battery-powered systems.
- 🎛️ Two 16-bit Timers + Three 8-bit Timers — Excellent for PWM, motor control & event timing.
- 📦 Compact TQFP-32 Package — Ideal for space-constrained embedded PCB designs.
Technical Specifications
| Parameter | Value | Notes |
|---|---|---|
| CPU Architecture | 8-bit AVR RISC | High-performance pipeline architecture |
| Program Flash | 32KB | Self-programmable |
| SRAM / EEPROM | 2KB / 1KB | Non-volatile storage available |
| Operating Voltage | 1.8V – 5.5V | Supports battery operation |
| Clock Frequency | Up to 20MHz | External crystal or internal oscillator |
| Timers | 2×16-bit, 3×8-bit | PWM, frequency generation |
| Interfaces | 2×USART, 2×I²C, 2×SPI | More peripherals than ATmega328P |
| ADC | 10-bit, 8 channels | High-resolution analog sensing |
| Package | TQFP-32 | ATmega328PB-AU |
Applications
Ideal for PWM-based speed and servo control.
Multiple communication interfaces for IoT stacks.
Reliable MCU for harsh environments.
Enhanced drop-in replacement for Arduino Uno/Nano MCUs.
Design Tips
- Use a 16MHz or 20MHz crystal with 22pF capacitors for maximum performance.
- Add 0.1µF decoupling capacitors close to each VCC/AVCC pin.
- Connect AVCC through a low-pass filter for improved ADC accuracy.
- Ensure proper RESET pull-up resistor (10kΩ).
