ATMEGA1280V-8AU - 8MHz 128KB Flash AVR MCU | Microchip
MPN: ATMEGA1280V-8AU β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $15.29 | $15.29 |
| 10 | $14.53 | $145.30 |
| 100 | $13.76 | $1,376.00 |
| 500 | $12.94 | $6,470.00 |
| 1,000 | $12.12 | $12,120.00 |
ATMEGA1280V-8AU Overview
An 8-bit microcontroller is a complete computing system on a single chip that integrates a CPU, program memory, data memory, and a rich set of peripherals. Within the power-management and embedded-control hierarchy, MCUs like the ATmega1280 family sit at the top of the 8-bit AVR lineup, succeeding the ATmega128 by quadrupling Flash and expanding I/O and peripheral count. They are the successors in the AVR architecture lineage originally developed by Atmel, now manufactured and supported by Microchip Technology.
Key differentiating features include the advanced RISC architecture with 133 powerful instructions, most executing in a single clock cycle, plus 32 general purpose working registers. The device provides six flexible timer/counters with compare modes and PWM, four USARTs for multi-channel serial communication, a byte-oriented 2-wire interface (I2C/TWI), an SPI interface, a 10-bit ADC, a real-time counter, and programmable Watchdog Timer with internal oscillator. In-System Programmable (ISP) Flash enables firmware updates without removing the part from the board.
Architecturally, the AVR Harvard structure separates program and data buses, allowing single-cycle instruction fetch and execution. The pipelined fetch/decode stage sustains throughput close to 1 MIPS per MHz, so at 8MHz the ATMEGA1280V-8AU delivers roughly 8 MIPS while remaining in the low-power V-class voltage envelope.
Typical applications include 3D printer and CNC controller boards, industrial automation nodes, dataloggers, and multi-serial-port gateway modules, where its four USARTs and 86 GPIO lines eliminate external port expanders.
A key design consideration: the V suffix denotes the low-voltage grade, so full-speed 8MHz operation is guaranteed across the 2.7V to 5.5V range - do not substitute a 16MHz speed-grade part without revisiting supply voltage and brown-out detector thresholds.
This page synthesizes distributor pricing, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet, adding unique comparison value beyond raw specification listings.
Drop-in alternatives for ATMEGA1280V-8AU β 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 ATMEGA1280V-8AU (same form factor and footprint) β differing in ADC Channels, EEPROM, Flash Memory, Package, SRAM.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATMEGA1280-16AU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA1280V-8CU
β Drop-Inβ In Stock
$6.1 / Unit
View Datasheet βATMEGA640V-8AU
β Drop-Inπ Reference alternative (not in catalog)
ATMEGA2560V-8AU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA2560-16AU
β Drop-Inπ Reference alternative (not in catalog)
ATMEGA640-16AU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA1280V-8AU Maximum Ratings & Electrical Characteristics
| Core Processor | AVR |
| Core Size | 8-Bit |
| Max Clock Speed | 8 MHz |
| Flash Memory | 128 KB (64K x 16) |
| SRAM | 8 KB |
| EEPROM | 4 KB |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Number of I/O | 86 |
| Timers/Counters | 6 (with compare modes and PWM) |
| USART | 4 |
| Communication Interfaces | I2C (TWI), SPI, 4x USART |
| ADC Channels | 16-channel, 10-bit |
| Instructions | 133 instructions, most single-cycle |
| Working Registers | 32 x 8-bit general purpose |
| Package | 100-TQFP (14 x 14 mm, 1.0 mm height) |
| Mounting Type | Surface Mount |
| Programming | In-System Programmable (ISP) |
| Watchdog Timer | Yes, with internal oscillator |
| Lifecycle Status | Active |
ATMEGA1280V-8AU 100-tqfp (14 x 14 mm, 1.0 mm height) Pin Configuration Guide
Pin configuration for ATMEGA1280V-8AU (100-tqfp (14 x 14 mm, 1.0 mm height) 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 ATMEGA1280V-8AU.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA1280V-8AU is suitable for 6 applications: 3D Printer and CNC Controller Boards, Industrial Automation and Control Nodes, Data Acquisition and Datalogging Systems, Multi-Port Serial Gateway Modules, Battery-Powered Portable Instruments, Hobby, Education, and Prototype Robotics.
3D Printer and CNC Controller Boards
The ATMEGA1280V-8AU fits motion-control boards because its 86 GPIO lines drive multiple stepper sockets, limit switches, heaters, and fans without external port expanders, while its four USARTs handle host serial links, SD-card modules, and debugging concurrently. Running at 8MHz from a 5V rail inside the 2.7V to 5.5V envelope, it executes the step-pulse timing needed for classic RAMPS-class electronics, and 128KB Flash accommodates feature-rich motion firmware with planner buffers. The 10-bit ADC reads thermistors for temperature loops, and six timer/counters generate PWM for heater and fan control - a quantified benefit of consolidating all motion, thermal, and communication tasks in one AVR die.
Recommended
Industrial Automation and Control Nodes
In industrial automation, the ATMEGA1280V-8AU serves as a sensor-aggregation and actuation node where its 86 GPIO and 16-channel 10-bit ADC digitize switches, encoders, and analog transducers across a machine cell. The 2.7V to 5.5V supply tolerance rides out brownouts common on factory floors, and the programmable Watchdog Timer with its own internal oscillator recovers the system if firmware locks up - a reliability feature valued in 24/7 equipment. Four USARTs allow simultaneous Modbus RTU links to multiple drives plus a human-machine interface, while the byte-oriented TWI (I2C) bus connects I/O expanders and RTC modules, consolidating functions that would otherwise require several smaller controllers.
Recommended
Data Acquisition and Datalogging Systems
The ATMEGA1280V-8AU is well matched to dataloggers: its 16-channel 10-bit ADC samples up to 16 analog sensors, 4KB EEPROM stores calibration constants through power cycles, and the 8KB SRAM buffers measurement records between writes to external Flash or SD storage over SPI. The V-grade 2.7V to 5.5V supply range allows direct operation from three-cell battery stacks around 3.3V to 4.5V, and the low-power AVR architecture supports sleep modes that stretch battery life between sampling bursts. The real-time counter keeps timestamped logs running through deep-sleep periods, and ISP Flash permits field firmware updates when logging requirements evolve, extending instrument service life.
Recommended
Multi-Port Serial Gateway Modules
Gateways that bridge serial protocols benefit directly from the ATMEGA1280V-8AU's four USARTs - a rarity in the 8-bit segment - enabling simultaneous RS-232, RS-485, and TTL links without software-multiplexed UART emulation. At 8MHz the core sustains roughly 8 MIPS, enough to forward, filter, and re-frame protocol traffic between a Modbus fieldbus and a supervisory link while meeting the byte-timing of multi-drop 9600-to-115200 bps buses. The 2.7V to 5.5V supply range matches common RS-485 transceiver rails, and 128KB Flash holds multiple protocol stacks plus configuration storage in EEPROM. TWI and SPI interfaces add expansion room for isolated digital I/O at the gateway edge.
Recommended
Battery-Powered Portable Instruments
For portable instruments, the ATMEGA1280V-8AU combines a 2.7V floor - compatible with two Li-cell or four NiMH stacks - with AVR sleep modes that cut supply current to microamp levels between measurements. Its 8MHz V-grade rating means no performance penalty at 3.3V, unlike standard-grade AVRs that must clock down, so sampling and display-update code run at full speed from a battery rail. The 10-bit ADC handles sensor inputs directly, EEPROM retains user calibration, and 86 GPIO drive keys, indicators, and interface peripherals on a single controller. SPI and TWI buses connect low-power displays and memory cards, keeping the whole bill of materials optimized for battery budgets.
Recommended
Hobby, Education, and Prototype Robotics
The ATMEGA1280V-8AU underpins large-pin-count robotics and educational platforms because the AVR toolchain (AVR-GCC, Microchip Studio, and Arduino-compatible bootloaders) is mature and well documented for beginners and professionals alike. Its 86 GPIO lines control multiple servos via hardware timers, read quadrature encoders, and drive LCDs simultaneously - tasks that force smaller AVRs into port expanders. Four USARTs support telemetry, Bluetooth modules, and PC links at once, while 128KB Flash leaves generous headroom for student projects that balloon with libraries. ISP and bootloader programming means no socket adapters are required, and the low-cost 100-TQFP keeps educational kits affordable per board.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA1280V-8AU β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA1280-16AU | ATMEGA1280V-8CU | ATMEGA640V-8AU | ATMEGA2560V-8AU | ATMEGA2560-16AU |
|---|---|---|---|---|---|---|
| Package | 100-TQFP (14x14 mm) | 100-TQFP (14x14 mm) - same | 100-TQFP (14x14 mm) - same | 100-TQFP (14x14 mm) - same | 100-TQFP (14x14 mm) - same | 100-TQFP (14x14 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 128 KB | 128 KB | 128 KB | 64 KB | 256 KB | 256 KB |
| SRAM | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB |
| EEPROM | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB |
| Max Clock Speed | 8 MHz | 16 MHz | 8 MHz | 8 MHz | 8 MHz | 16 MHz |
| Supply Voltage Range | 2.7 V to 5.5 V | 4.5 V to 5.5 V (full speed) | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 4.5 V to 5.5 V (full speed) |
| GPIO Count | 86 | 86 | 86 | 86 | 86 | 86 |
Key Differentiators
- Low-voltage grade with full 8MHz across the entire rail (vs ATMEGA1280-16AU)
- Double the Flash of the smaller family member (vs ATMEGA640V-8AU)
- Lower cost for designs under 128KB (vs ATMEGA2560V-8AU)
- Four USARTs consolidate multi-serial designs (vs ATMEGA1280V-8CU)
Design Notes
The V-grade ATMEGA1280V-8AU is specified from 2.7V to 5.5V, but ADC accuracy degrades as VCC approaches the 2.7V floor - Microchip's AVR datasheet family expresses ADC resolution in LSB relative to AVCC, so regulate AVCC cleanly and decouple AVCC with a 100nF ceramic plus 10uF bulk, with an LC or RC filter separating AVCC from noisy digital VCC. Place a 100nF decoupling capacitor at every VCC/AVCC pin pair of the 100-TQFP; the 14x14 mm body has several power pins, and omitting any local capacitor is the most common root cause of brown-out resets on this family.
For the 100-TQFP (0.5mm lead pitch), define footprint pads per Microchip's recommended landing pattern and allow a minimum of 2 extra grid positions for fanout vias on the four sides - 86 GPIO lines plus power almost always require two signal layers minimum. Route the crystal (XTAL1/XTAL2) traces short and guarded by ground, and keep the RESET trace away from switching loads; enable the internal brown-out detector (BOD) at a threshold compatible with your lowest operating voltage (e.g., 2.7V systems need a BOD level at or below the minimum rail) to prevent Flash corruption during slow power decay.
Do not clock the ATMEGA1280V-8AU above 8MHz: the V grade is tested and guaranteed to 8MHz across 2.7V to 5.5V, and running at 16MHz (as a 16MHz-grade part would) exceeds the device specification with no guaranteed margins. When substituting an AU-grade with a CU-grade or 2560 variant, confirm the JTAGEN and CKDIV8 fuse defaults, since revision differences have historically shipped different fuse settings that leave boards dead-on-arrival until reprogrammed via ISP.
With 86 GPIO switching, ground bounce on the 100-TQFP becomes measurable when many outputs toggle simultaneously. Mitigate by configuring unused outputs low rather than floating, staggering port writes in firmware, and maximizing the number of low-inductance GND returns under the package. For ADC channels sharing a port with fast-switching outputs, sample only after a settle delay or dedicate the ADC port exclusively to analog signals to preserve the 10-bit resolution the converter can otherwise deliver.
Compliance Information
Compliance data was not present in the provided web data. Modern Microchip ATmega parts are typically RoHS-compliant and lead-free, but confirm against the official Microchip product page or environmental datasheet before procurement.
