| PartNumber | ATMEGA16U2-MU | ATMEGA16U2-AU | ATMEGA16U2-AUR |
| Description | 8-bit Microcontrollers - MCU AVR USB 8K FLASH AVR USB 16K FLASH | 8-bit Microcontrollers - MCU AVR USB 8K FLASH AVR,USB16K FLASH | 8-bit Microcontrollers - MCU USB 8K FLASH 16 MHz |
| 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-32 | TQFP-32 | TQFP-32 |
| Series | ATmega16U2 | ATmega16U2 | ATmega16U2 |
| Core | AVR | AVR | AVR |
| Data Bus Width | 8 bit | 8 bit | 8 bit |
| Maximum Clock Frequency | 16 MHz | 16 MHz | 16 MHz |
| Program Memory Size | 16 kB | 16 kB | - |
| Data RAM Size | 1.25 kB | 1.25 kB | - |
| ADC Resolution | No ADC | No ADC | - |
| Number of I/Os | 22 I/O | 22 I/O | - |
| Operating Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| Minimum Operating Temperature | - 40 C | - 40 C | - |
| Maximum Operating Temperature | + 85 C | + 85 C | - |
| Packaging | Tray | Tray | Reel |
| Height | 0.95 mm | 1 mm | - |
| Length | 5 mm | 7 mm | - |
| Product | MCU | MCU | MCU |
| Program Memory Type | Flash | Flash | - |
| Width | 5 mm | 7 mm | - |
| Brand | Microchip Technology / Atmel | Microchip Technology / Atmel | Microchip Technology / Atmel |
| Data RAM Type | SRAM | SRAM | - |
| Data ROM Size | 512 B | 512 B | - |
| Data ROM Type | EEPROM | EEPROM | - |
| Interface Type | SPI, UART | SPI, UART | - |
| Number of Timers/Counters | 2 Timer | 2 Timer | - |
| Processor Series | megaAVR | megaAVR | megaAVR |
| Product Type | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU |
| Factory Pack Quantity | 490 | 250 | 2000 |
| Subcategory | Microcontrollers - MCU | Microcontrollers - MCU | Microcontrollers - MCU |
| Supply Voltage Max | 5.5 V | 5.5 V | - |
| Supply Voltage Min | 2.7 V | 2.7 V | - |
| Tradename | AVR | AVR | AVR |
| Unit Weight | 0.006653 oz | 0.002568 oz | 0.002568 oz |
| Moisture Sensitive | - | Yes | - |