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| PartNumber | ATMEGA329P-20ANR | ATMEGA329P-20AU | ATMEGA329P-20AN |
| Description | 8-bit Microcontrollers - MCU AVR 32K FLSH 2K SRAM 1KB EE-20 MHZ 105C | 8-bit Microcontrollers - MCU AVR 32K FLSH 2K SRAM 1KB EE - 20 MHZ 5V | 8-bit Microcontrollers - MCU AVR 32K FLSH 2K SRAM 1KB EE-20 MHZ 105C |
| Manufacturer | Microchip | Microchip | Microchip |
| Product Category | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU |
| RoHS | Y | Y | Y |
| Package / Case | TQFP-64 | TQFP-64 | - |
| Series | ATmega329P | ATmega329P | ATmega329P |
| Core | AVR | AVR | AVR |
| Data Bus Width | 8 bit | 8 bit | 8 bit |
| Maximum Clock Frequency | 20 MHz | 20 MHz | 20 MHz |
| Operating Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| Packaging | Reel | Tray | Tray |
| Product | MCU | MCU | MCU |
| Brand | Microchip Technology / Atmel | Microchip Technology / Atmel | Microchip Technology / Atmel |
| Processor Series | megaAVR | megaAVR | megaAVR |
| Product Type | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU |
| Factory Pack Quantity | 1000 | 90 | 90 |
| Subcategory | Microcontrollers - MCU | Microcontrollers - MCU | Microcontrollers - MCU |
| Tradename | AVR | AVR | AVR |
| Mounting Style | - | SMD/SMT | - |
| Program Memory Size | - | 32 kB | - |
| Data RAM Size | - | 2 kB | - |
| ADC Resolution | - | 10 bit | - |
| Number of I/Os | - | 54 I/O | - |
| Minimum Operating Temperature | - | - 40 C | - |
| Maximum Operating Temperature | - | + 85 C | - |
| Height | - | 1 mm | - |
| Length | - | 14 mm | - |
| Program Memory Type | - | Flash | - |
| Width | - | 14 mm | - |
| Data RAM Type | - | SRAM | - |
| Data ROM Size | - | 1 kB | - |
| Data ROM Type | - | EEPROM | - |
| Interface Type | - | SPI, USART, USI | - |
| Moisture Sensitive | - | Yes | - |
| Number of ADC Channels | - | 8 | - |
| Number of Timers/Counters | - | 3 Timer | - |
| Supply Voltage Max | - | 5.5 V | - |
| Supply Voltage Min | - | 2.7 V | - |
| Unit Weight | - | 0.012720 oz | - |