The ATMEGA8U2-AU is a low-power 8-bit AVR microcontroller with built-in USB support. Based on the AVR enhanced RISC architecture, it executes most instructions in a single clock cycle, achieving throughputs approaching 1 MIPS per MHz. It's commonly used as a USB-to-serial bridge on Arduino boards.

This is the TQFP-32 surface-mount package variant, suitable for custom PCB designs and replacement parts.

Key Features

• AVR RISC Architecture – Single-cycle instruction execution for efficient processing
• Built-in USB – Full-speed USB 2.0 controller
• 8KB Flash Memory – In-system programmable with read-while-write capability
• 512 Bytes EEPROM – Non-volatile data storage
• 512 Bytes SRAM – Working memory
• 22 GPIO Pins – General purpose I/O lines
• 32 Working Registers – Directly connected to ALU for fast execution

Specifications

• Microcontroller – ATMEGA8U2-AU
• Architecture – 8-bit AVR RISC
• Flash – 8KB (ISP)
• EEPROM – 512 bytes
• SRAM – 512 bytes
• GPIO – 22 pins
• Timers – 2× flexible timer/counters with compare modes and PWM
• Communication – 1× USART, SPI, USB 2.0, DebugWIRE
• Package – TQFP-32 (SMD)

Ideal For

• USB-to-serial bridge applications
• Arduino board replacements and repairs
• Custom USB device firmware development
• Embedded systems requiring USB connectivity

Package Contents

• 1× ATMEGA8U2-AU microcontroller (TQFP-32)

Resources

• ATMEGA8U2 Datasheet (PDF)