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ATXMEGA64A3U-AN Equivalent & Substitute Parts
Part Overview
The ATXMEGA64A3U-AN is an AVR XMEGA A3U microcontroller manufactured by Microchip Technology, designed for embedded applications requiring 8/16-bit processing capability. This Surface Mount device operates at 32MHz with 64KB FLASH program memory and is housed in a 64-TQFP package. The part maintains Active product status and is ROHS3 compliant. Substitute parts are identified to address inventory availability, packaging preferences, or specific operational temperature requirements while maintaining functional equivalence.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | Microchip Technology |
| Series | AVR® XMEGA® A3U |
| Core Processor | AVR |
| Core Size | 8/16-Bit |
| Speed | 32MHz |
| Program Memory Size | 64KB (32K x 16) |
| Program Memory Type | FLASH |
| EEPROM Size | 2K x 8 |
| RAM Size | 4K x 8 |
| Number of I/O | 50 |
| Voltage Supply (Vcc/Vdd) | 1.6V ~ 3.6V |
| Data Converters | A/D 16x12b; D/A 2x12b |
| Connectivity | I2C, IrDA, SPI, UART/USART, USB |
| Peripherals | Brown-out Detect/Reset, DMA, POR, PWM, WDT |
| Oscillator Type | Internal |
| Mounting Type | Surface Mount |
| Package / Case | 64-TQFP (14x14) |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 3 (168 Hours) |
| Product Status | Active |
Substitute Part Grouping Explanation
Substitution eligibility for the ATXMEGA64A3U-AN is determined by strict equivalence across the following critical parameters:
- Manufacturer & Series: Both parts must be Microchip Technology AVR® XMEGA® A3U devices
- Core Architecture: 8/16-Bit AVR processor
- Clock Speed: 32MHz operation
- Memory Configuration: 64KB FLASH, 2K x 8 EEPROM, 4K x 8 RAM
- I/O Count: 50 I/O pins
- Connectivity & Peripherals: Identical I2C, IrDA, SPI, UART/USART, USB, and peripheral support
- Package: 64-TQFP (14x14) Surface Mount
- Supply Voltage: 1.6V ~ 3.6V range
- Compliance: ROHS3 and REACH status
The ATXMEGA64A3U-AU qualifies as a direct substitute based on these parameters. Differences in packaging format (Tray vs. standard) and operating temperature range do not affect functional equivalence for applications within the overlapping temperature specification.
Parameter Comparison
| Parameter | ATXMEGA64A3U-AN | ATXMEGA64A3U-AU |
|---|---|---|
| Manufacturer | Microchip Technology | Microchip Technology |
| Series | AVR® XMEGA® A3U | AVR® XMEGA® A3U |
| Core Processor | AVR | AVR |
| Core Size | 8/16-Bit | 8/16-Bit |
| Speed | 32MHz | 32MHz |
| Program Memory Size | 64KB (32K x 16) | 64KB (32K x 16) |
| EEPROM Size | 2K x 8 | 2K x 8 |
| RAM Size | 4K x 8 | 4K x 8 |
| Number of I/O | 50 | 50 |
| Voltage Supply (Vcc/Vdd) | 1.6V ~ 3.6V | 1.6V ~ 3.6V |
| Data Converters | A/D 16x12b; D/A 2x12b | A/D 16x12b; D/A 2x12b |
| Connectivity | I2C, IrDA, SPI, UART/USART, USB | I2C, IrDA, SPI, UART/USART, USB |
| Peripherals | Brown-out Detect/Reset, DMA, POR, PWM, WDT | Brown-out Detect/Reset, DMA, POR, PWM, WDT |
| Oscillator Type | Internal | Internal |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | 64-TQFP (14x14) | 64-TQFP (14x14) |
| Operating Temperature | -40°C ~ 105°C (TA) | -40°C ~ 85°C (TA) |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 3 (168 Hours) | 3 (168 Hours) |
| Product Status | Active | Active |
Engineering Selection Recommendations
Both the ATXMEGA64A3U-AN and ATXMEGA64A3U-AU maintain Active product status from Microchip Technology and are ROHS3 compliant with identical MSL ratings. Selection between these parts should be based on:
Operating Temperature Requirements: The ATXMEGA64A3U-AN supports -40°C to 105°C operation, while the ATXMEGA64A3U-AU operates from -40°C to 85°C. Applications requiring operation above 85°C must use the ATXMEGA64A3U-AN.
Packaging & Inventory: The ATXMEGA64A3U-AU is supplied in Tray packaging with higher inventory availability (6560 Pcs vs. 947 Pcs). Selection may be driven by procurement volume requirements and supply chain considerations.
Functional Equivalence: Within the overlapping temperature range (-40°C to 85°C), both parts are functionally equivalent and interchangeable at the circuit level.
Frequently Asked Questions (FAQ)
Q: Can ATXMEGA64A3U-AU replace ATXMEGA64A3U-AN in all applications?
A: The ATXMEGA64A3U-AU is functionally equivalent for applications operating within -40°C to 85°C. Applications requiring operation above 85°C must use the ATXMEGA64A3U-AN, which is rated to 105°C.
Q: Are there differences in pin configuration between these parts?
A: No. Both parts use identical 64-TQFP (14x14) packaging with 50 I/O pins. Pin assignments and functionality are identical.
Q: What is the significance of the packaging difference (Tray vs. standard)?
A: Packaging format affects handling, storage, and procurement logistics but does not impact electrical or mechanical performance. Tray packaging typically accommodates higher-volume orders.
Q: Are both parts ROHS3 compliant?
A: Yes. Both ATXMEGA64A3U-AN and ATXMEGA64A3U-AU are ROHS3 compliant with identical Moisture Sensitivity Level (MSL) ratings of 3 (168 Hours).
Q: Can these parts be used interchangeably on the same PCB?
A: Yes, within the temperature operating range of -40°C to 85°C. No circuit modifications are required for substitution.
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