ATMEGA2560V-8AU - 256KB Flash, 1.8-5.5V AVR MCU | Microchip
MPN: ATMEGA2560V-8AU β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $13.72 | $13.72 |
| 10 | $13.2 | $132.00 |
| 100 | $12.6 | $1,260.00 |
| 500 | $11.9 | $5,950.00 |
| 1,000 | $11.3 | $11,300.00 |
ATMEGA2560V-8AU Overview
A microcontroller (MCU) is a complete computer-on-a-chip that integrates a CPU core, program and data memory, and peripherals such as timers, serial interfaces and analog converters on a single die. Within the power-management-and-embedded-systems hierarchy, the ATmega2560 family sits in the mainstream 8-bit flash MCU class, sitting above smaller ATmega parts (ATmega168, ATmega328P) and below 32-bit ARM-based MCUs for applications that need very large GPIO and peripheral counts.
Key features include the advanced AVR RISC architecture executing 131 powerful instructions, mostly in a single clock cycle, with 32 general purpose working registers and fully static operation for up to 16 MIPS throughput at 16 MHz (8 MHz maximum at the V low-voltage grade). The device integrates six flexible timer/counters with compare modes and PWM, four USARTs, a byte-oriented 2-wire serial interface (I2C/TWI), an SPI interface, a real-time counter, a watchdog timer, and a 16-channel 10-bit ADC. In-system programmable (ISP) flash enables field firmware updates without removing the chip.
The V suffix denotes the extended low-voltage operating range of 1.8 V to 5.5 V, which allows direct operation from two alkaline cells or a single lithium cell with a boost converter, making the ATMEGA2560V-8AU particularly attractive for battery-powered instruments. The Harvard-architecture dual-memory bus keeps program fetch and data access independent, sustaining efficient C-compiled code density. Internal RC oscillator options reduce external component count, while the crystal/oscillator inputs XTAL1/XTAL2 support precise timing for USART communication.
Typical applications include industrial automation controllers with large I/O counts, 3D printer mainboards (the Arduino Mega 2560 platform), robotics control boards, data loggers, and low-power battery-operated measurement equipment that must exploit the wide supply range and four USART channels.
Design consideration: at 1.8 V the maximum guaranteed clock rate drops well below 8 MHz, so consult the maximum frequency versus supply voltage curve in the manufacturer datasheet and scale your system clock accordingly to stay within safe operating bounds.
This page synthesizes distributor pricing, drop-in same-family alternatives, a full 100-pin TQFP pinout, and practical design notes not consolidated in the manufacturer datasheet. Pricing references are as of 2026-09-17.
Drop-in alternatives for ATMEGA2560V-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 ATMEGA2560V-8AU (same form factor and footprint) β differing in Package, ADC Channels, Instructions, Supply Voltage Range, Timers/Counters.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATMEGA2560-16AU
β Drop-Inβ In Stock
$8.87 / Unit
View Datasheet βATMEGA1280V-8AU
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$12.12 / Unit
View Datasheet βATMEGA1280-16AU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA640V-8AU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA640-16AU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA2560V-8AU Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit AVR RISC |
| Program Memory Size | 256 KB FLASH |
| SRAM Size | 8 KB |
| EEPROM Size | 4 KB |
| General Purpose I/O | 86 pins |
| Supply Voltage Range | 1.8 V to 5.5 V |
| Maximum Clock Frequency | 8 MHz |
| ADC | 16-channel, 10-bit |
| USART Count | 4 |
| Timer/Counters | 6 with compare modes and PWM |
| Serial Interfaces | 4x USART, TWI (2-wire), SPI |
| Throughput | up to 16 MIPS |
| Instructions | 131, most single-cycle |
| Operating Temperature | -40C to +85C |
| Package | 100-pin TQFP |
| Mounting Type | Surface Mount |
| Oscillator Type | Internal |
| In-System Programming | Yes (ISP FLASH) |
ATMEGA2560V-8AU Pin Configuration
| Pin 1 | PG5 β Port G / OC0B output compare |
| Pin 2 | PG2 β Port G / ALE external memory address latch enable |
| Pin 3 | PG1 β Port G / RD external memory read |
| Pin 4 | PG0 β Port G / WR external memory write |
| Pin 5 | VCC β Digital supply voltage |
| Pin 6 | GND β Ground |
| Pin 7 | PE2 β Port E / ALE (alternate) |
| Pin 8 | PE1 β Port E / TXD0 / PDO |
| Pin 9 | PE0 β Port E / RXD0 / PDI |
| Pin 10 | PB7 β Port B / OC2A / OC1C / PCINT7 |
| Pin 11 | PB6 β Port B / OC1B / PCINT6 |
| Pin 12 | PB5 β Port B / OC1A / PCINT5 |
| Pin 13 | PB4 β Port B / OC0A / PCINT4 |
| Pin 14 | PB3 β Port B / MISO (SPI) / PCINT3 |
| Pin 15 | PB2 β Port B / MOSI (SPI) / PCINT2 |
| Pin 16 | PB1 β Port B / SCK (SPI) / PCINT1 |
| Pin 17 | PB0 β Port B / SS (SPI) / PCINT0 |
| Pin 18 | PH0 β Port H / RXD2 |
| Pin 19 | PH1 β Port H / TXD2 |
| Pin 20 | PH2 β Port H / XCK2 |
| Pin 21 | PH3 β Port H / OC4A |
| Pin 22 | PH4 β Port H / OC4B |
| Pin 23 | PH5 β Port H / OC4C |
| Pin 24 | PH6 β Port H / OC2B |
| Pin 25 | VCC β Digital supply voltage |
| Pin 26 | GND β Ground |
| Pin 27 | PH7 β Port H / T4 |
| Pin 28 | PG3 β Port G / TOSC2 (RTC crystal) |
| Pin 29 | PG4 β Port G / TOSC1 (RTC crystal) |
| Pin 30 | RESET β Reset input / programming |
| Pin 31 | VCC β Digital supply voltage |
| Pin 32 | GND β Ground |
| Pin 33 | XTAL2 β Inverting oscillator output |
| Pin 34 | XTAL1 β Inverting oscillator input / external clock |
| Pin 35 | PL0 β Port L / ICP4 input capture |
| Pin 36 | PL1 β Port L / ICP5 input capture |
| Pin 37 | PL2 β Port L / T5 |
| Pin 38 | PL3 β Port L / OC5A |
| Pin 39 | PL4 β Port L / OC5B |
| Pin 40 | PL5 β Port L / OC5C |
| Pin 41 | PL6 β Port L, general purpose I/O |
| Pin 42 | PL7 β Port L, general purpose I/O |
| Pin 43 | PD0 β Port D / SCL (TWI) / INT0 |
| Pin 44 | PD1 β Port D / SDA (TWI) / INT1 |
| Pin 45 | PD2 β Port D / RXD1 / INT2 |
| Pin 46 | PD3 β Port D / TXD1 / INT3 |
| Pin 47 | PD4 β Port D / ICP1 input capture |
| Pin 48 | PD5 β Port D / XCK1 |
| Pin 49 | PD6 β Port D / T1 |
| Pin 50 | PD7 β Port D / T0 |
| Pin 51 | VCC β Digital supply voltage |
| Pin 52 | GND β Ground |
| Pin 53 | PC0 β Port C / A8 external memory address |
| Pin 54 | PC1 β Port C / A9 external memory address |
| Pin 55 | PC2 β Port C / A10 external memory address |
| Pin 56 | PC3 β Port C / A11 external memory address |
| Pin 57 | PC4 β Port C / A12 external memory address |
| Pin 58 | PC5 β Port C / A13 external memory address |
| Pin 59 | PC6 β Port C / A14 external memory address |
| Pin 60 | PC7 β Port C / A15 external memory address |
| Pin 61 | VCC β Digital supply voltage |
| Pin 62 | GND β Ground |
| Pin 63 | PA0 β Port A / AD0 external memory data/address |
| Pin 64 | PA1 β Port A / AD1 external memory data/address |
| Pin 65 | PA2 β Port A / AD2 external memory data/address |
| Pin 66 | PA3 β Port A / AD3 external memory data/address |
| Pin 67 | PA4 β Port A / AD4 external memory data/address |
| Pin 68 | PA5 β Port A / AD5 external memory data/address |
| Pin 69 | PA6 β Port A / AD6 external memory data/address |
| Pin 70 | PA7 β Port A / AD7 external memory data/address |
| Pin 71 | PJ0 β Port J / RXD3 / PCINT9 |
| Pin 72 | PJ1 β Port J / TXD3 / PCINT10 |
| Pin 73 | PJ2 β Port J / XCK3 / PCINT11 |
| Pin 74 | PJ3 β Port J / PCINT12 |
| Pin 75 | PJ4 β Port J / PCINT13 |
| Pin 76 | PJ5 β Port J / PCINT14 |
| Pin 77 | PJ6 β Port J / PCINT15 |
| Pin 78 | VCC β Digital supply voltage |
| Pin 79 | GND β Ground |
| Pin 80 | PJ7 β Port J, general purpose I/O |
| Pin 81 | PK0 β Port K / ADC8 / PCINT17 |
| Pin 82 | PK1 β Port K / ADC9 / PCINT18 |
| Pin 83 | PK2 β Port K / ADC10 / PCINT19 |
| Pin 84 | PK3 β Port K / ADC11 / PCINT20 |
| Pin 85 | PK4 β Port K / ADC12 / PCINT21 |
| Pin 86 | PK5 β Port K / ADC13 / PCINT22 |
| Pin 87 | PK6 β Port K / ADC14 / PCINT23 |
| Pin 88 | PK7 β Port K / ADC15 |
| Pin 89 | PF0 β Port F / ADC0 |
| Pin 90 | PF1 β Port F / ADC1 |
| Pin 91 | PF2 β Port F / ADC2 |
| Pin 92 | PF3 β Port F / ADC3 |
| Pin 93 | PF4 β Port F / ADC4 / TCK (JTAG) |
| Pin 94 | PF5 β Port F / ADC5 / TMS (JTAG) |
| Pin 95 | PF6 β Port F / ADC6 / TDO (JTAG) |
| Pin 96 | PF7 β Port F / ADC7 / TDI (JTAG) |
| Pin 97 | AREF β Analog reference for ADC |
| Pin 98 | GND β Ground |
| Pin 99 | AVCC β Analog supply voltage for ADC |
| Pin 100 | AGND β Analog ground |
Typical Applications
ATMEGA2560V-8AU is suitable for 6 applications: Industrial Automation Controllers, 3D Printer Mainboards, Battery-Powered Data Loggers, Robotics Control Boards, Multi-Channel Measurement Instruments, IoT and Smart-Home Gateway Nodes.
Industrial Automation Controllers
The ATMEGA2560V-8AU's 86 GPIO lines, six timer/counters and four USARTs make it a natural fit for PLC-style I/O modules, sensor hubs and machine controllers that must read many discrete inputs and drive relays or stepper drivers simultaneously. Four independent USART channels allow simultaneous RS-485 fieldbus, Modbus RTU, HMI and debug links without software multiplexing, while the 16-channel 10-bit ADC digitizes analog transducer signals across the full 0-VDD range. Because the V grade runs from 1.8 V to 5.5 V, the same controller design can be ported across 5 V industrial rails and 3.3 V logic backplanes without redesign. In-system programmable flash enables field firmware updates on installed equipment.
Recommended
3D Printer Mainboards
This is the classic ATmega2560 application: the Arduino Mega 2560 platform established the 100-pin TQFP AVR as the de facto 3D printer controller, coordinating up to five stepper axes, multiple thermistor inputs on the 16-channel ADC, heated-bed PWM from its timer/counters, and LCD plus SD-card SPI traffic concurrently. The ATMEGA2560V-8AU is functionally identical to the 16 MHz 5 V part used on official boards, though it is guaranteed only to 8 MHz, so designers should either clock it at 8 MHz or verify margin if running faster. Its abundant hardware PWM channels eliminate bit-banging for extruder and fan control, keeping loop timing deterministic for print quality.
Recommended
Battery-Powered Data Loggers
The extended 1.8 V to 5.5 V supply range of the ATMEGA2560V-8AU is the headline advantage for battery instruments: two alkaline cells (nominally 3 V, dropping to 1.8 V end-of-life) or a single lithium cell can power the MCU directly without a boost converter. Combined with power-down and power-save sleep modes, the real-time counter and watchdog, the device can spend most of its life dormant and wake on interval or interrupt to sample the 16-channel ADC and timestamp readings. Scaling the clock down at low voltage keeps operation within the safe frequency-versus-VCC envelope, trading throughput for drastically reduced energy per acquisition cycle.
Recommended
Robotics Control Boards
Robot controllers benefit from the ATmega2560's combination of large I/O count and hardware PWM: six timer/counters provide many simultaneous PWM channels for servo and motor-driver control, while four USARTs handle motor-controller command buses, an IMU link, and telemetry concurrently. The 10-bit ADC reads current-sense shunts and battery voltage for closed-loop supervision, and the external memory interface (ports A and C as AD/A buses) supports SRAM expansion for map-building or path-planning data structures. The V grade allows integration into 3.3 V sensor ecosystems and battery stacks directly, while in-system flash programming supports field retuning of control gains.
Recommended
Multi-Channel Measurement Instruments
Handheld and bench measurement products exploit the 16-channel 10-bit ADC and 86 GPIO lines of the ATMEGA2560V-8AU to multiplex many sensors through one MCU, including thermistors, strain gauges via front-end amplifiers, and voltage dividers. Four USARTs and SPI/TWI interfaces connect precision external converters (24-bit delta-sigma ADCs) when the internal 10-bit converter is insufficient, letting the AVR act as the system supervisor, display driver and communications processor. The internal oscillator reduces BOM cost in cost-sensitive meters, while a crystal option delivers the timing accuracy needed for UART-based data upload. The wide 1.8-5.5 V range supports rechargeable-cell-powered portable instruments.
Recommended
IoT and Smart-Home Gateway Nodes
The ATMEGA2560V-8AU serves as a protocol-conversion hub in smart-building nodes: its four USARTs and TWI (I2C) master interface aggregate RF modules, Zigbee/LoRa radio shields, and wired sensor buses, while abundant GPIO drives relays, dimmers and status indicators. The 256 KB flash accommodates protocol stacks plus OTA-update buffering logic, and the 10-bit ADC reads mains-presence and temperature sensors. Because the V grade tolerates supply sag down to 1.8 V, the node can ride through brownouts on a small backup cell and log the event, improving installation reliability. SPI exposes SD-card or flash memory for local event buffering during network outages.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA2560V-8AU β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA2560-16AU | ATMEGA1280V-8AU | ATMEGA1280-16AU | ATMEGA640V-8AU | ATMEGA640-16AU |
|---|---|---|---|---|---|---|
| Package | TQFP-100 | TQFP-100 - same | TQFP-100 - same | TQFP-100 - same | TQFP-100 - same | TQFP-100 - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 256 KB | 256 KB | 128 KB | 128 KB | 64 KB | 64 KB |
| SRAM | 8 KB | 8 KB | 4 KB | 4 KB | 8 KB | 8 KB |
| EEPROM | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB |
| Supply Voltage | 1.8 V to 5.5 V | 4.5 V to 5.5 V | 1.8 V to 5.5 V | 4.5 V to 5.5 V | 1.8 V to 5.5 V | 4.5 V to 5.5 V |
| Max Clock Frequency | 8 MHz | 16 MHz | 8 MHz | 16 MHz | 8 MHz | 16 MHz |
| GPIO / Peripherals | 86 I/O, 4 USART, 16ch 10-bit ADC | 86 I/O, 4 USART, 16ch 10-bit ADC | 86 I/O, 4 USART, 16ch 10-bit ADC | 86 I/O, 4 USART, 16ch 10-bit ADC | 86 I/O, 4 USART, 16ch 10-bit ADC | 86 I/O, 4 USART, 16ch 10-bit ADC |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Key Differentiators
- Extended 1.8 V low-voltage operation (vs ATMEGA2560-16AU)
- Full 256 KB flash with identical footprint (vs ATMEGA1280V-8AU)
- Four USARTs and six timers on one chip (vs ATMEGA640V-8AU)
Design Notes
Respect the maximum-frequency-versus-VCC relationship of the V grade: while the -8AU is marketed to 8 MHz, the safe operating frequency degrades as supply voltage approaches 1.8 V. For battery designs that run below 2.7 V, clock the device at 4 MHz or lower, or add an undervoltage detector that forces a lower clock or sleep mode when the cell voltage droops. Distribute decoupling across all seven VCC pins (5, 25, 31, 51, 61, 78 plus AVCC at 99) with 100 nF ceramics placed within 2 mm of each supply pin.
Isolate the analog domain: AVCC (pin 99), AGND (pin 100) and AREF (pin 97) form a separate analog supply island. Connect AVCC to VCC through an LC filter (10 uH ferrite bead plus 100 nF and 10 uF capacitors) and tie AGND to the analog ground region of a split ground plane, joining the planes at a single star point near the ADC. Keep the ADC input nets (PK0-PK7, PF0-PF7) away from XTAL and USART switching lines. Bypass AREF with 100 nF to AGND only, never a large capacitor, to preserve ADC settling speed.
Bootloader and clock mismatches are the most common field issue: boards designed for the 16 MHz ATMEGA2560-16AU that receive an ATMEGA2560V-8AU run the 16 MHz crystal outside the V part's guaranteed range below 4.5 V, causing UART framing errors and bootloader failures as documented in Arduino community threads. Verify the fuses select the correct crystal setting, and confirm your firmware timing constants match the actual installed speed grade before mass programming. RESET (pin 30) needs a 10 k pull-up for reliable ISP entry.
Compliance Information
ATmega2560 series parts in TQFP packaging are RoHS-compliant and lead-free per Microchip product pages; REACH and conflict-mineral declarations not stated in the provided data.
