The Microchip ATMEGA1281-16AU is an 8-bit AVR microcontroller that provides 128 KB of flash, 8 KB of SRAM and 4 KB of EEPROM in a 64-lead TQFP package, running at up to 16 MHz. It integrates a 10-bit ADC, two USARTs, SPI and TWI, together with a rich timer and PWM set, and operates across a 2.7 V to 5.5 V supply range. The larger SRAM makes it well suited to data-buffering embedded applications such as industrial control, communication gateways and data acquisition.
Key Specifications
| Manufacturer | Microchip Technology |
| Manufacturer Part Number | ATMEGA1281-16AU |
| Product Category | 8-bit Microcontrollers – MCU |
| Package / Case | 64-TQFP |
| Mounting Type | Surface Mount |
| Operating Temperature | -40°C to +85°C |
| Power Supply | 2.7 V to 5.5 V |
| Program Memory | 128 KB Flash |
| SRAM / EEPROM | 8 KB / 4 KB |
| Maximum Clock | 16 MHz |
| I/O Lines | 54 |
| ADC | 10-bit, 8 channels |
| Interfaces | 2x USART, SPI, TWI (I2C) |
| Lifecycle Status | Active |
| Official Documentation | View official documentation |
Key Features
- 128 KB flash program memory
- 8 KB SRAM for data buffering
- 2.7 V to 5.5 V supply range
- 8-channel 10-bit ADC
- Two USARTs plus SPI and TWI
- 16 MHz maximum clock
- PWM and multiple timer/counters
- Industrial temperature range
Applications
- Industrial control and automation
- Communication gateways
- Data acquisition systems
- Sensor interfaces
- Embedded control
Sourcing
Availability, lead time, date code and commercial terms are subject to confirmation at the time of quotation.
Quality
CHIPER sources brand-new, unused components and provides quality inspection, shortage and long lead-time sourcing, and one-stop BOM procurement. Every part is verified before shipment.
FAQ
What is the difference between ATmega1281 and ATmega128?
The ATmega1281 doubles the SRAM to 8 KB and provides a similar peripheral set in the same 64-lead TQFP package.
What temperature grade does the -AU suffix indicate?
The U suffix indicates the industrial temperature range of -40°C to +85°C.