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| Part Number | ATMEGA16U4-AU | ATMEGA16U4-AUR | ATMEGA16U4-MU | ATMEGA16U2-AU |
|---|---|---|---|---|
| Manufacturer | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Product Status | Active | Active | Active | Active |
| Core Processor | AVR | AVR | AVR | AVR |
| Core Size | 8-Bit | 8-Bit | 8-Bit | 8-Bit |
| Speed | 16MHz | 16MHz | 16MHz | 16MHz |
| Connectivity | I²C, SPI, UART/USART, USB | I²C, SPI, UART/USART, USB | I²C, SPI, UART/USART, USB | SPI, UART/USART, USB |
| Peripherals | Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT | Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT | Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT | Brown-out Detect/Reset, POR, PWM, WDT |
| Number of I/O | 26 | 26 | 26 | 22 |
| Program Memory Size | 16KB (8K x 16) | 16KB (8K x 16) | 16KB (8K x 16) | 16KB (8K x 16) |
| Program Memory Type | Flash | Flash | Flash | Flash |
| EEPROM Size | 512 x 8 | 512 x 8 | 512 x 8 | 512 x 8 |
| RAM Size | 1.25K x 8 | 1.25K x 8 | 1.25K x 8 | 512 x 8 |
| Voltage - Supply (Vcc/Vdd) | 2.7V ~ 5.5V | 2.7V ~ 5.5V | 2.7V ~ 5.5V | 2.7V ~ 5.5V |
| Data Converters | A/D 12x10b | A/D 12x10b | A/D 12x10b | - |
| Oscillator Type | Internal | Internal | Internal | Internal |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Package / Case | 44-TQFP | 44-TQFP | 44-VFQFN Exposed Pad | 32-TQFP |
| Supplier Device Package | 44-TQFP (10x10) | 44-TQFP (10x10) | 44-VQFN (7x7) | 32-TQFP (7x7) |
