ATMEGA128A-U 8-bit AVR Microcontroller with 128KB ISP Flash
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Prices updated: 12 Oct 2026
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About this product
8-bit AVR microcontroller with 128 KB of in-system programmable flash. It suits embedded control, data logging and projects that need many I/O pins and more code space. It can be programmed through the ISP interface with a standard AVR programmer.
Specifications
- Core
- 8-bit AVR
- Flash memory
- 128 KB (ISP)
- SRAM
- 4 KB
- EEPROM
- 4 KB
Frequently asked questions
How do I program it?
Use the ISP interface with the MOSI, MISO, SCK and RESET pins, using an AVRISP, USBasp or an Arduino acting as an ISP programmer.
Is it compatible with Arduino Mega?
No. The Arduino Mega uses the ATmega2560, which has a different pinout and memory map. Code and board definitions must target the ATmega128 specifically.
