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ATXMEGA128A4U-AU
Microchip Technology
IC MCU 8/16BIT 128KB FLSH 44TQFP
1827 Pcs New Original In Stock
AVR AVR® XMEGA® A4U Microcontroller IC 8/16-Bit 32MHz 128KB (64K x 16) FLASH 44-TQFP (10x10)
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5.0 / 5.0
- (432 Ratings)
ATXMEGA128A4U-AU
Product Overview
1251021
DiGi Electronics Part Number
ATXMEGA128A4U-AU-DGManufacturer
Microchip Technology
ATXMEGA128A4U-AU
Description
IC MCU 8/16BIT 128KB FLSH 44TQFPInventory
1827 Pcs New Original In Stock
AVR AVR® XMEGA® A4U Microcontroller IC 8/16-Bit 32MHz 128KB (64K x 16) FLASH 44-TQFP (10x10)
Quantity
Minimum 1
Minimum 1
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ATXMEGA128A4U-AU Technical Specifications
Category
Embedded, Microcontrollers
Packaging
Tray
Series
AVR® XMEGA® A4U
Product Status
Active
DiGi-Electronics Programmable
Verified
Core Processor
AVR
Core Size
8/16-Bit
Speed
32MHz
Connectivity
I2C, IrDA, SPI, UART/USART, USB
Peripherals
Brown-out Detect/Reset, DMA, POR, PWM, WDT
Number of I/O
34
Program Memory Size
128KB (64K x 16)
Program Memory Type
FLASH
EEPROM Size
2K x 8
RAM Size
8K x 8
Voltage - Supply (Vcc/Vdd)
1.6V ~ 3.6V
Data Converters
A/D 12x12b; D/A 2x12b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C (TA)
Mounting Type
Surface Mount
Supplier Device Package
44-TQFP (10x10)
Package / Case
44-TQFP
Base Product Number
ATXMEGA128
Datasheet & Documents
Manuals
XMEGA AU Manual
HTML Datasheet
ATXMEGA128A4U-AU-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
3 (168 Hours)
REACH Status
REACH Unaffected
ECCN
5A992C
HTSUS
8542.31.0001
Additional Information
Other Names
ATXMEGA128A4UAU
Standard Package
160
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
항상 프로페셔널한 모습과 친절한 응대가 인상적입니다.
de desembre 02, 2025
Die Lieferung kam viel früher als gedacht und die Verpackung war äußerst robust—perfekt geschützt.
de desembre 02, 2025
The packaging is robust and well-designed, protecting the products during transit and preventing any damage.
de desembre 02, 2025
Excellent responsiveness from their after-sales department, very professional.
de desembre 02, 2025
Their green packaging and low prices make shopping both economical and sustainable.
de desembre 02, 2025
Their proactive inventory management allows us to count on timely deliveries.
de desembre 02, 2025
The packaging quality always exceeds my expectations and adds a touch of professionalism.
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Frequently Asked Questions (FAQ)
What are the key design risks when replacing an ATXMEGA128A4U-AU with a competing ARM Cortex-M0+ microcontroller like the SAMD21G18A in a battery-powered industrial sensor node?
Replacing the ATXMEGA128A4U-AU with a SAMD21G18A introduces several design risks despite similar core performance. The ATXMEGA128A4U-AU operates down to 1.6V, enabling ultra-low-power designs with minimal external regulation, while the SAMD21G18A requires a minimum of 1.62V but typically needs stable 1.8V or 3.3V rails, increasing quiescent current in sleep modes. Additionally, the ATXMEGA128A4U-AU integrates true 12-bit DACs and event system for peripheral-to-peripheral communication without CPU intervention—features not fully matched on the SAMD21. Migrating firmware also requires rewriting low-level drivers due to architectural differences in clocking, interrupt handling, and USB stack implementation, increasing validation effort and risk of timing-related bugs in real-time control loops.
How does the internal oscillator accuracy of the ATXMEGA128A4U-AU impact USB 2.0 Full-Speed communication in a cost-sensitive consumer device without an external crystal?
The ATXMEGA128A4U-AU includes a factory-trimmed internal 32MHz RC oscillator with ±0.5% accuracy over voltage and temperature, which meets USB 2.0 Full-Speed (±0.25% data rate tolerance) requirements only if the internal oscillator is recalibrated using the USB Start-of-Frame (SOF) packet as a reference. Without this calibration routine—commonly implemented via firmware during USB enumeration—the internal oscillator may drift beyond acceptable limits, causing enumeration failures or intermittent disconnects. For high-volume, cost-sensitive designs, this adds firmware complexity but avoids the BOM cost of an external 8MHz crystal. However, in environments with wide temperature swings (e.g., outdoor enclosures), periodic re-calibration or fallback to an external resonator may be necessary to ensure robust USB operation.
Can the ATXMEGA128A4U-AU safely drive 5V-tolerant logic inputs when powered at 3.3V in a mixed-voltage system with legacy TTL components?
Yes, the ATXMEGA128A4U-AU I/O pins are 5V-tolerant even when the MCU is powered at 3.3V, allowing direct interfacing with 5V TTL/CMOS logic without level shifters—a significant advantage in legacy system integration. However, this tolerance does not extend to analog inputs or ADC channels; applying >VCC + 0.3V to an ADC pin can cause substrate injection and measurement errors. Additionally, while digital inputs safely accept 5V signals, output high levels (VOH) will only reach ~3.3V, which may not reliably meet VIH of some 5V CMOS devices (typically ≥3.5V). For reliable bidirectional communication, use open-drain configurations with pull-ups to 5V or verify noise margins empirically under worst-case loading conditions.
What reliability concerns should be addressed when using the ATXMEGA128A4U-AU in automotive under-hood applications near its -40°C to 85°C operating limit?
Although the ATXMEGA128A4U-AU is rated for -40°C to 85°C (TA), sustained operation at temperature extremes in under-hood environments introduces reliability risks. At 85°C ambient, internal junction temperatures can exceed 100°C during high CPU load or flash programming, accelerating electromigration and reducing long-term flash endurance. The datasheet specifies 100,000 write/erase cycles for flash, but this assumes 25°C; at elevated temperatures, effective endurance drops significantly. Mitigation includes derating CPU frequency during thermal events, minimizing in-application flash writes, and adding thermal vias under the 44-TQFP package to improve heat dissipation. Also, ensure PCB layout minimizes thermal gradients across the package to prevent solder joint fatigue over thermal cycling.
Is it feasible to use the ATXMEGA128A4U-AU as a drop-in replacement for the older AT90USB1286 in a USB HID device design, and what firmware changes are critical?
The ATXMEGA128A4U-AU is not a direct drop-in replacement for the AT90USB1286 due to architectural and peripheral differences, despite both supporting USB. The ATXMEGA128A4U-AU uses a modern AVR XMEGA core with enhanced DMA, event system, and different USB endpoint architecture, requiring a complete rewrite of USB descriptor handling and endpoint management code. Clock configuration is also fundamentally different: the AT90USB1286 relies on an external crystal for USB, while the ATXMEGA128A4U-AU can use its internal oscillator with SOF calibration. Additionally, pinout and package differ (44-TQFP vs. 64-TQFP), necessitating PCB layout changes. However, the transition offers benefits like lower power, integrated DACs, and better real-time response—justifying the redesign effort for new builds, but not recommended for legacy board revisions without thorough signal integrity and timing validation.
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ATXMEGA128A4U-AU CAD Models
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