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ATMEGA1284P-AU (8-Bit AVR Microcontroller - 44-TQFP SMD Package)

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When your custom PCB design requires the simplicity and robust 5V tolerance of an 8-bit AVR, but you have completely exhausted the memory and I/O limits of the ATmega328P, the ATMEGA1284P-AU is the ultimate drop-in upgrade. Affectionately known in the hardware community as the "MightyCore," this chip delivers a colossal 128KB of Flash memory and an enormous 16KB of SRAM. This provides incredible headroom for compiling heavy libraries, buffering massive graphics for TFT displays, or managing complex communication stacks.

The "-AU" designation signifies that this powerhouse is housed in a compact 44-pin Thin Quad Flat Package (TQFP). Unlike its massive, breadboard-hogging DIP-40 sibling, this surface-mount package is highly optimized for custom, space-constrained circuit boards. It features a forgiving 0.8mm pin pitch that is perfectly suited for automated pick-and-place manufacturing while remaining entirely manageable for skilled hand-soldering. With 32 programmable I/O pins, an integrated JTAG interface for live debugging, and dual hardware UARTs, it is the undisputed king of high-end 8-bit project boards.

Key Features & Functional Advantages:

  • Massive Memory Reserves: Features 128KB of Flash and an unparalleled 16KB of SRAM (eight times the RAM of an Arduino Uno), effortlessly handling heavy data arrays, JSON parsing, and RTOS implementations.

  • Dual Hardware UARTs: Equipped with two completely independent hardware serial ports, making it trivial to simultaneously communicate with a PC and a secondary serial device (like a GPS module, Wi-Fi modem, or Nextion display) without software serial bottlenecks.

  • Compact TQFP-44 Package: Significantly reduces your required PCB real estate compared to the through-hole version, allowing for sleek, professional device enclosures.

  • Integrated JTAG Interface: Unlike smaller AVR chips, the 1284P features a dedicated JTAG port (IEEE 1149.1 compliant) for extensive on-chip debugging and boundary-scan testing during prototype development.

  • Robust 5V Architecture: Natively supports 5V logic across all of its 32 I/O pins, completely eliminating the need for logic level shifters when interfacing with classic industrial sensors and relays.

Perfect For:

  • Custom IoT Gateways: The ultimate 8-bit controller for smart home hubs, utilizing the dual hardware UARTs to manage both a local sensor network and an external ESP32 or cellular modem.

  • Advanced 3D Printer Controllers: Historically heavily utilized as the main processor for reliable, 8-bit 3D printer motherboards (such as the Melzi board) due to its high pin count and memory.

  • Heavy Data-Logging Hardware: The massive 16KB SRAM buffer is perfect for accumulating high-speed, multi-channel sensor data before writing it in large blocks to an SD card to prevent data loss.

  • "MightyCore" Custom PCBs: Fully compatible with the popular third-party "MightyCore" Arduino framework, allowing you to scale your favorite Arduino code up to a massive, professional-grade circuit board.

Technical Specifications:

  • Core Processor: 8-Bit AVR RISC (PicoPower)

  • Maximum Clock Speed: 20 MHz

  • Program Memory (Flash): 128 KB

  • SRAM: 16 KB

  • EEPROM: 4 KB

  • Operating Voltage Range: 1.8V – 5.5V (Note: High-speed 16-20MHz operation requires 4.5V+)

  • Total I/O Pins: 32

  • Analog-to-Digital Converter (ADC): 8 Channels, 10-bit resolution

  • Communication Interfaces: 2 x UART/USART, 1 x SPI, 1 x I2C (Two-Wire Interface), 1 x JTAG

  • Hardware Timers: Four total (Two 8-bit, Two 16-bit)

  • Package / Case: 44-TQFP (Thin Quad Flat Package)

  • Mounting Type: Surface Mount (SMD/SMT)

  • Operating Temperature: -40°C to 85°C (Industrial)

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Please note, a delivery fee of €4.99 applies for orders under €50. For those in remote areas, be aware that our couriers may apply an extra surcharge. This additional fee helps cover the costs of transporting your items to harder-to-reach locations.