ATMEGA1280-16AUR - 16MHz 128KB AVR MCU | Microchip
MPN: ATMEGA1280-16AUR ✓ ActiveATMEGA1280-16AUR Overview
An AVR microcontroller is a single-chip embedded controller that executes compact instructions from internal Flash memory while integrating memory, I/O, timers, communication interfaces, and analog conversion functions. Within the product hierarchy, the ATMEGA1280 belongs to the 8-bit AVR family of RISC-based microcontrollers, positioned for industrial and embedded systems that need more I/O and memory than smaller entry-level MCUs provide.
The key features include 128 KB ISP Flash, 8 KB SRAM, 4 KB EEPROM, 86 general-purpose I/O lines, 32 general-purpose working registers, and 53 I/O ports. The device also provides six flexible timer/counters, real-time counter capability, programmable timer PWM, a 10-bit ADC, and multiple serial interfaces for connected embedded systems.
Its communication resources include two USARTs, SPI, and a byte-oriented 2-wire serial interface. The ADC supports 16 channels and 10-bit resolution, while an on-chip analog comparator and watchdog timer broaden the functions available for control, monitoring, and communications-oriented designs. These integrated peripherals reduce the need for external logic in suitable applications.
Typical applications include industrial automation controllers, data-acquisition systems, communication hubs, instrumentation, and embedded control platforms with substantial external connectivity. The 86 I/O lines are particularly useful when a design needs multiple digital interfaces, while 128 KB Flash provides room for a larger embedded firmware image than many compact 8-bit MCUs.
Designers should preserve the required decoupling capacitors and keep sensitive analog and communication routes away from fast-switching nodes. Firmware replacement must also account for boot-loader behavior, fuse settings, and the distinct peripheral organization of related megaAVR devices rather than assuming every 100-pin AVR has identical pin multiplexing.
This page consolidates verified manufacturer and distributor information, same-package drop-in candidates, pricing context, and practical selection guidance. It also distinguishes verified electrical facts from fields that still require confirmation from the complete manufacturer datasheet before a board-level design is released.
Drop-in alternatives for ATMEGA1280-16AUR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ATMEGA1280-16AUR (same form factor and footprint) — differing in Package, ADC, Operating Temperature, Analog Comparator, Flash Memory.
ATMEGA2560-16AUR
✅ Drop-InContact for price
View Datasheet →ATMEGA2561-16AUR
✅ Drop-InContact for price
View Datasheet →ATMEGA640-16AUR
✅ Drop-InContact for price
View Datasheet →ATMEGA1281-16AUR
✅ Drop-In ⚠️ Specs UnverifiedContact for price
View Datasheet →ATMEGA2560-16CUR
✅ Drop-InContact for price
View Datasheet →ATMEGA1280-16AUR Maximum Ratings & Electrical Characteristics
| Microcontroller Type | 8-bit AVR RISC microcontroller |
| Maximum Clock Speed | 16 MHz |
| Flash Memory | 128 KB (64K x 16) |
| SRAM | 8 KB |
| EEPROM | 4 KB |
| General-Purpose I/O Lines | 86 lines |
| I/O Ports | 53 |
| General-Purpose Working Registers | 32 |
| Supply Voltage Range | 2.7 V to 5.5 V |
| ADC Resolution | 10-bit |
| ADC Channels | 16 |
| Timer/Counter Count | 6 |
| USART Count | 2 |
| Serial Interface | SPI and byte-oriented 2-wire serial interface |
| Analog Comparator | 1 on-chip comparator |
| Watchdog Timer | Programmable with separate on-chip oscillator |
| Operating Temperature | -40°C to +85°C |
| Package | 100-TQFP (14 x 14 mm) |
| Mounting Type | Surface mount |
| Lifecycle Stage | Active |
ATMEGA1280-16AUR 100-tqfp (14 x 14 mm) Pin Configuration Guide
Pin configuration for ATMEGA1280-16AUR (100-tqfp (14 x 14 mm) package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for ATMEGA1280-16AUR.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA1280-16AUR is suitable for 6 applications: Industrial Automation Controller, Data Acquisition System, Serial Communication Gateway, Programmable Logic Controller, Instrumentation and Measurement, Multi-Protocol Embedded Platform.
Industrial Automation Controller
The ATMEGA1280-16AUR fits industrial automation controllers that coordinate sensors, actuators, operator interfaces, and multiple communications ports. Its 86 general-purpose I/O lines provide substantial board-level connectivity, while six timer/counters support timing, PWM, and event-control functions. The 16 MHz AVR core executes control logic directly from 128 KB of in-system programmable Flash, and the verified -40°C to +85°C range suits extended-temperature equipment. At the same time, the 2.7 V to 5.5 V supply range allows integration with 3.3 V and 5 V system rails. Designers should preserve the device's pin multiplexing, provide local decoupling, and isolate industrial wiring from sensitive analog and communication routes.
Recommended
Data Acquisition System
ATMEGA1280-16AUR is appropriate for compact data-acquisition equipment requiring analog inputs, digital status signals, and local data processing. Its 16-channel, 10-bit ADC handles sensor signals within the microcontroller, while 86 general-purpose I/O lines can support switches, indicators, communications transceivers, and external data sources. The 128 KB Flash provides room for acquisition routines and nonvolatile configuration data, and 8 KB SRAM supports working buffers. Compared with a host-based acquisition arrangement, the MCU can perform local filtering and control. The 2.7 V to 5.5 V operating range simplifies integration with mixed-voltage peripherals, although analog grounding and reference-noise control remain essential.
Recommended
Serial Communication Gateway
The ATMEGA1280-16AUR suits serial gateways that bridge multiple embedded devices through UART, SPI, and 2-wire interfaces. Two USARTs support independent point-to-point links, while SPI and the byte-oriented 2-wire interface provide additional channels to sensors, memory, transceivers, or expansion devices. Its 16 MHz clock supports protocol handling and framing tasks, and 128 KB Flash can accommodate firmware for several interfaces. The large 86-line I/O complement also leaves adequate pins for indicators and controls. In a gateway implementation, prioritize deterministic interrupt handling and buffer management, and place serial lines away from switching nodes to reduce susceptibility to electromagnetic and signal-integrity problems.
Recommended
Programmable Logic Controller
ATMEGA1280-16AUR can serve as the core of a compact programmable logic controller for machinery, test systems, or building automation. Six flexible timer/counters, programmable timer PWM, a watchdog timer, and 86 general-purpose I/O lines provide the timing and discrete I/O resources commonly required by PLC-style products. The 128 KB Flash stores application logic, while 8 KB SRAM and 4 KB EEPROM provide working and nonvolatile storage. Its 2.7 V to 5.5 V supply range supports both common logic voltages, and the -40°C to +85°C rating covers extended industrial environments. Firmware should include safe-state behavior, output reset defaults, and watchdog servicing because the MCU may directly control external equipment.
Recommended
Instrumentation and Measurement
The ATMEGA1280-16AUR fits instrumentation requiring local measurement, operator communication, and flexible control outputs. Its 16-channel 10-bit ADC supports analog measurement channels, and the on-chip analog comparator can support threshold or basic waveform-detection functions. Two USARTs plus SPI and 2-wire serial interfaces allow simultaneous connections to displays, transducers, memory, or laboratory equipment. With 128 KB Flash, the controller can combine acquisition, calibration, and communications routines without relying on external program storage. The extended -40°C to +85°C range supports industrial measurement environments. Designers should account for ADC accuracy limits, reference stability, analog input filtering, and separate routing of analog and digital return currents.
Recommended
Multi-Protocol Embedded Platform
ATMEGA1280-16AUR supports embedded platforms that combine monitoring, control, and serial connectivity without a separate programmable-logic device. The 86 general-purpose I/O lines leave room for sensors, relays, status indicators, and communication interfaces, while six timers provide independent timing resources. Its AVR architecture and 16 MHz clock are well suited to straightforward supervisory firmware in 128 KB of Flash. The device can also use 2.7 V to 5.5 V power rails to interface with mixed-voltage logic in industrial or commercial equipment. A practical design should reserve boot and programming access, validate the 10-bit ADC performance for the intended signals, and use short ground returns to protect communications and analog measurements from switching noise.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA1280-16AUR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA2560-16AUR | ATMEGA2561-16AUR | ATMEGA640-16AUR | ATMEGA1281-16AUR | ATMEGA2560-16CUR |
|---|---|---|---|---|---|---|
| Manufacturer | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 100-TQFP (14 x 14 mm) | 100-TQFP (14 x 14 mm) - same package | 100-TQFP (14 x 14 mm) - same package | 100-TQFP (14 x 14 mm) - same package | 100-TQFP (14 x 14 mm) - same package | 100-TQFP (14 x 14 mm) - same package |
| Maximum Clock Speed | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 16 MHz |
| Flash Memory | 128 KB | 256 KB | 256 KB | 64 KB | 128 KB | 256 KB |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
Key Differentiators
- Lower Flash capacity than the pin-compatible 2560-family option (vs ATMEGA2560-16AUR)
- Two-USART configuration compared with the larger 2560 device (vs ATMEGA2560-16AUR)
- Twice the Flash capacity of the ATMEGA640 same-package candidate (vs ATMEGA640-16AUR)
Design Notes
Keep the ATMEGA1280-16AUR within its verified 2.7 V to 5.5 V supply range and follow the capacitor recommendations in the complete Microchip ATmega1280 documentation. Place bulk and high-frequency bypass capacitance close to the appropriate supply pins, minimize loop area, and provide a low-impedance ground return. If the board combines 3.3 V and 5 V peripherals, analyze sequencing and level-shift requirements independently of the MCU supply.
Preserve access to the programming and boot interfaces when placing the 100-pin TQFP device. Route the 16 MHz clock and sensitive analog inputs away from high-current switching paths, and keep the ADC ground connection consistent with the device's recommended analog layout. Because related megaAVR devices use the same footprint but can have different peripheral pin assignments, verify the final pin multiplexing against the exact replacement MPN rather than relying only on package dimensions.
Do not assume that every 16 MHz, 100-pin megaAVR is a transparent software substitute. ATMEGA2560-16AUR doubles Flash and offers four USARTs, ATMEGA640-16AUR reduces Flash to 64 KB, and related parts can differ in timer, communication, and pin-multiplex resources. Check memory usage, interrupt vectors, peripheral assignments, fuse settings, boot-loader assumptions, and package orientation before approving a drop-in replacement.
Compliance Information
The supplied verified source set does not explicitly provide compliance declarations for ATMEGA1280-16AUR. The -40°C to +85°C operating range is a temperature specification and does not by itself establish AEC-Q100 qualification.
