| PartNumber | ATXMEGA128B3-MCU | ATXMEGA128B3-MHR | ATXMEGA128B3-MCUR |
| Description | 8-bit Microcontrollers - MCU AVR XMEGA 128KB FLASH 2KB EE 8K | 8-bit Microcontrollers - MCU AVR XMEGA 64KB FLASH1KB EE4KSRAM | 8-bit Microcontrollers - MCU AVR XMEGA 128KB FLASH 2KB EE 8K |
| Manufacturer | Microchip | Microchip | Microchip |
| Product Category | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU |
| Mounting Style | SMD/SMT | SMD/SMT | SMD/SMT |
| Package / Case | VQFN-64 | QFN-64 | VQFN-64 |
| Series | XMEGA B3 | XMEGA B3 | XMEGA B3 |
| Core | AVR | AVR | AVR |
| Data Bus Width | 8 bit | 8 bit/16 bit | 8 bit |
| Maximum Clock Frequency | 32 MHz | 32 MHz | 32 MHz |
| Program Memory Size | 128 kB | 128 kB | 128 kB |
| Data RAM Size | 8 kB | 8 kB | 8 kB |
| ADC Resolution | 12 bit | 12 bit | 12 bit |
| Number of I/Os | 36 I/O | 36 I/O | 36 I/O |
| Operating Supply Voltage | 3.6 V | 1.6 V to 3.6 V | 3.6 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 |
| Data RAM Type | SRAM | SRAM | SRAM |
| Data ROM Size | 2 kB | 2 kB | 2 kB |
| Data ROM Type | EEPROM | EEPROM | EEPROM |
| Interface Type | I2C, SPI, UART, USB | 2-Wire, SPI, USB | I2C, SPI, UART, USB |
| Moisture Sensitive | Yes | Yes | - |
| Number of ADC Channels | 8 | 8 | 8 |
| Number of Timers/Counters | 2 Timer | 4 Timer | 2 Timer |
| Processor Series | xmega128B3 | AVR XMEGA | xmega128B3 |
| Product Type | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU |
| Factory Pack Quantity | 360 | 4000 | 4000 |
| Subcategory | Microcontrollers - MCU | Microcontrollers - MCU | Microcontrollers - MCU |
| Supply Voltage Max | 3.6 V | - | 3.6 V |
| Supply Voltage Min | 1.6 V | - | 1.6 V |
| Tradename | XMEGA | XMEGA | XMEGA |
| Unit Weight | 0.008021 oz | 0.007277 oz | 0.008021 oz |
| RoHS | - | Y | - |