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| PartNumber | AT32UC3A0256-ALUT | AT32UC3A0256-ALUR | AT32UC3A0256-CTUR |
| Description | 32-bit Microcontrollers - MCU 32-bit 256KB Flash | 32-bit Microcontrollers - MCU 256KB, 144LQFP 85deg. Green | 32-bit Microcontrollers - MCU 256KB, 144FFBGA Ind |
| Manufacturer | Microchip | Microchip | Microchip |
| Product Category | 32-bit Microcontrollers - MCU | 32-bit Microcontrollers - MCU | 32-bit Microcontrollers - MCU |
| RoHS | Y | Y | Y |
| Mounting Style | SMD/SMT | SMD/SMT | SMD/SMT |
| Package / Case | LQFP-144 | LQFP-144 | FFBGA-144 |
| Series | AT32UC3A0 | AT32UC3A0 | AT32UC3A0 |
| Core | AVR | AVR | AVR |
| Data Bus Width | 32 bit | 32 bit | 32 bit |
| Maximum Clock Frequency | 66 MHz | 66 MHz | 66 MHz |
| Program Memory Size | 256 kB | 256 kB | 256 kB |
| Data RAM Size | 64 kB | 64 kB | 64 kB |
| ADC Resolution | 10 bit | 10 bit | 10 bit |
| Number of I/Os | 109 I/O | 109 I/O | 109 I/O |
| Operating Supply Voltage | 1.8 V, 3.3 V | 1.8 V, 3.3 V | 1.8 V, 3.3 V |
| Minimum Operating Temperature | - 40 C | - 40 C | - 40 C |
| Maximum Operating Temperature | + 85 C | + 85 C | + 85 C |
| Packaging | Tray | Reel | Reel |
| Program Memory Type | Flash | Flash | Flash |
| Brand | Microchip Technology / Atmel | Microchip Technology / Atmel | Microchip Technology / Atmel |
| Interface Type | 2-Wire, RS-485, SPI, USART | 2-Wire, RS-485, SPI, USART | 2-Wire, SPI, USART |
| Moisture Sensitive | Yes | - | - |
| Number of ADC Channels | 8 Channel | 8 Channel | 8 Channel |
| Number of Timers/Counters | 1 x 16 bit | 1 x 16 bit | 1 x 16 bit |
| Processor Series | AT32UC3x | AT32UC3x | AT32UC3x |
| Product Type | 32-bit Microcontrollers - MCU | 32-bit Microcontrollers - MCU | 32-bit Microcontrollers - MCU |
| Factory Pack Quantity | 60 | 800 | 2000 |
| Subcategory | Microcontrollers - MCU | Microcontrollers - MCU | Microcontrollers - MCU |
| Supply Voltage Max | 1.95 V, 3.6 V | 1.95 V, 3.6 V | 1.95 V, 3.6 V |
| Supply Voltage Min | 1.65 V, 3 V | 1.65 V, 3 V | 1.65 V, 3 V |
| Tradename | AVR | AVR | AVR |
| Watchdog Timers | Watchdog Timer | Watchdog Timer | Watchdog Timer |
| Unit Weight | 0.045518 oz | 0.045518 oz | - |
| Height | - | 1.45 mm | 0.79 mm |
| Length | - | 20.1 mm | 11 mm |
| Width | - | 20.1 mm | 11 mm |