| 44-TQFP (10x10) | 512 | Surface Mount | 2.7 V | 5.5 V | EBI/EMI SPI UART/USART | 512 x 8 | Internal | AVR | 8 MHz | 8 KB | 44-TQFP | FLASH | 85 °C | -40 °C | 8-Bit | 35 | | |
| 44-VQFN (7x7) | 512 | Surface Mount | 4.5 V | 5.5 V | EBI/EMI SPI UART/USART | 512 x 8 | Internal | AVR | 16 MHz | 8 KB | 44-VFQFN Exposed Pad | FLASH | 85 °C | -40 °C | 8-Bit | 35 | | |
| 44-TQFP (10x10) | 512 | Surface Mount | 2.7 V | 5.5 V | EBI/EMI SPI UART/USART | 512 x 8 | Internal | AVR | 8 MHz | 8 KB | 44-TQFP | FLASH | 85 °C | -40 °C | 8-Bit | 35 | | |
| 44-TQFP (10x10) | 512 | Surface Mount | 4.5 V | 5.5 V | EBI/EMI SPI UART/USART | 512 x 8 | Internal | AVR | 16 MHz | 8 KB | 44-TQFP | FLASH | 85 °C | -40 °C | 8-Bit | 35 | | |
| 44-VQFN (7x7) | 512 | Surface Mount | 4.5 V | 5.5 V | EBI/EMI SPI UART/USART | 512 x 8 | Internal | AVR | 16 MHz | 8 KB | 44-VFQFN Exposed Pad | FLASH | 70 °C | 0 °C | 8-Bit | 35 | | |
| 44-PLCC (16.6x16.6) | 512 | Surface Mount | 4.5 V | 5.5 V | EBI/EMI SPI UART/USART | 512 x 8 | Internal | AVR | 16 MHz | 8 KB | 44-LCC (J-Lead) | FLASH | 85 °C | -40 °C | 8-Bit | 35 | | |
| 44-VQFN (7x7) | 512 | Surface Mount | 2.7 V | 5.5 V | EBI/EMI SPI UART/USART | 512 x 8 | Internal | AVR | 8 MHz | 8 KB | 44-VFQFN Exposed Pad | FLASH | 85 °C | -40 °C | 8-Bit | 35 | | |
| 44-TQFP (10x10) | 512 | Surface Mount | 4.5 V | 5.5 V | EBI/EMI SPI UART/USART | 512 x 8 | Internal | AVR | 16 MHz | 8 KB | 44-TQFP | FLASH | 70 °C | 0 °C | 8-Bit | 35 | | |
| 40-PDIP | 512 | Through Hole | 4.5 V | 5.5 V | EBI/EMI SPI UART/USART | 512 x 8 | Internal | AVR | 16 MHz | 8 KB | 40-DIP | FLASH | 85 °C | -40 °C | 8-Bit | 35 | 15.24 mm | 0.6 in |
| 44-TQFP (10x10) | 512 | Surface Mount | 2.7 V | 5.5 V | EBI/EMI SPI UART/USART | 512 x 8 | Internal | AVR | 8 MHz | 8 KB | 44-TQFP | FLASH | 85 °C | -40 °C | 8-Bit | 35 | | |