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| PartNumber | ATXMEGA256A3B-MH | ATXMEGA256A3B-AU | ATXMEGA256A3B-AUR |
| Description | 8-bit Microcontrollers - MCU 8/16 bit 1.6V-3.6V 256K+8K; Batt Backup | 8-bit Microcontrollers - MCU 256K FLASH 4K EE 16K SRAM 3.6V | 8-bit Microcontrollers - MCU 256KB FL 4KB EE 16K SRAM IND 1.6-3.6V |
| Manufacturer | Microchip | Microchip | Microchip |
| Product Category | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU |
| RoHS | Y | Y | Y |
| Mounting Style | SMD/SMT | SMD/SMT | SMD/SMT |
| Package / Case | QFN-64 | TQFP-64 | TQFP-64 |
| Series | XMEGA A3B | XMEGA A3B | XMEGA A3B |
| Core | AVR | AVR | AVR |
| Data Bus Width | 8 bit/16 bit | 8 bit/16 bit | 8 bit/16 bit |
| Maximum Clock Frequency | 32 MHz | 32 MHz | 32 MHz |
| Program Memory Size | 256 kB | 256 kB | 256 kB |
| Data RAM Size | 16 kB | 16 kB | 16 kB |
| ADC Resolution | 12 bit | 12 bit | - |
| Number of I/Os | 49 I/O | 49 I/O | 49 I/O |
| Operating Supply Voltage | 1.6 V to 3.6 V | 1.6 V to 3.6 V | 1.6 V to 3.6 V |
| Minimum Operating Temperature | - 40 C | - 40 C | - 40 C |
| Maximum Operating Temperature | + 85 C | + 85 C | + 85 C |
| Packaging | Tray | Tray | Reel |
| Height | 0.88 mm | - | - |
| Length | 9 mm | - | - |
| Product | MCU | MCU | MCU |
| Program Memory Type | Flash | Flash | - |
| Width | 9 mm | - | - |
| Brand | Microchip Technology / Atmel | Microchip Technology / Atmel | Microchip Technology / Atmel |
| Data RAM Type | SRAM | SRAM | - |
| Data ROM Size | 4 kB | 4 kB | 4 kB |
| Data ROM Type | EEPROM | EEPROM | - |
| Interface Type | I2C, SPI, USART | 2-Wire, SPI, USART | - |
| Number of ADC Channels | 8 | 16 Channel | - |
| Number of Timers/Counters | 7 Timer | 7 Timer | 7 Timer |
| Processor Series | AVR XMEGA | AVR XMEGA | AVR XMEGA |
| Product Type | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU |
| Factory Pack Quantity | 260 | 90 | 1000 |
| Subcategory | Microcontrollers - MCU | Microcontrollers - MCU | Microcontrollers - MCU |
| Tradename | XMEGA | XMEGA | XMEGA |
| Unit Weight | 0.007277 oz | 0.012720 oz | 0.012720 oz |
| Analog Supply Voltage | - | - | - |
| DAC Resolution | - | 12 bit | - |
| I/O Voltage | - | 1.6 V to 3.6 V | - |
| Moisture Sensitive | - | Yes | - |
| Supply Voltage Max | - | 3.6 V | - |
| Supply Voltage Min | - | 1.6 V | - |
| Watchdog Timers | - | Watchdog Timer | - |