| PartNumber | ATMEGA2561V-8AU | ATMEGA2561V-8AI | ATMEGA2561V-8AUR |
| Description | 8-bit Microcontrollers - MCU 256kB Flash 4kB EEPROM 54 I/O Pins | 8-bit Microcontrollers - MCU AVR 256K FLASH 4K EE 8K SRAM ADC 1.8V | 8-bit Microcontrollers - MCU AVR 256K FLSH 4K EE 8K SRAM ADC 5V-8MHz |
| Manufacturer | Microchip | Microchip | Microchip |
| Product Category | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU |
| RoHS | Y | N | Y |
| Mounting Style | SMD/SMT | SMD/SMT | SMD/SMT |
| Package / Case | TQFP-64 | TQFP-64 | TQFP-64 |
| Series | ATmega256x | ATmega256x | ATmega256x |
| Core | AVR | AVR | AVR |
| Data Bus Width | 8 bit | 8 bit | 8 bit |
| Maximum Clock Frequency | 8 MHz | 8 MHz | 8 MHz |
| Program Memory Size | 256 kB | 256 kB | - |
| Data RAM Size | 8 kB | 8 kB | - |
| Number of I/Os | 54 I/O | 54 I/O | - |
| Operating Supply Voltage | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V |
| Minimum Operating Temperature | - 40 C | - 40 C | - |
| Maximum Operating Temperature | + 85 C | + 85 C | - |
| Packaging | Tray | - | Reel |
| Height | 1 mm | 1 mm | - |
| Length | 14 mm | 14 mm | - |
| Product | MCU | MCU | MCU |
| Program Memory Type | Flash | Flash | - |
| Width | 14 mm | 14 mm | - |
| Brand | Microchip Technology / Atmel | Microchip Technology / Atmel | Microchip Technology / Atmel |
| Data RAM Type | SRAM | SRAM | - |
| Data ROM Size | 4 kB | 4 kB | - |
| Data ROM Type | EEPROM | EEPROM | - |
| Interface Type | 2-Wire, SPI, USART | 2-Wire, SPI, USART | - |
| Moisture Sensitive | Yes | - | Yes |
| Number of Timers/Counters | 6 Timer | 6 Timer | - |
| Processor Series | megaAVR | megaAVR | megaAVR |
| Product Type | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU |
| Factory Pack Quantity | 90 | 90 | 1000 |
| Subcategory | Microcontrollers - MCU | Microcontrollers - MCU | Microcontrollers - MCU |
| Supply Voltage Max | 5.5 V | 5.5 V | - |
| Supply Voltage Min | 1.8 V | 1.8 V | - |
| Tradename | AVR | AVR | AVR |
| Unit Weight | 0.012720 oz | 0.012720 oz | 0.012720 oz |