ATXMEGA64A4-MU Equivalent & Substitute Parts

Part Overview

The ATXMEGA64A4-MU is an AVR® XMEGA® A4 Series microcontroller manufactured by Microchip Technology. This 8/16-bit embedded processor features 64KB of FLASH program memory, operates at 32MHz, and integrates multiple communication interfaces including I2C, IrDA, SPI, and UART/USART. The device is housed in a 44-VQFN (7x7) surface mount package with an exposed pad.

The ATXMEGA64A4-MU is classified as obsolete. Identifying equivalent substitute parts is necessary for design continuity, procurement planning, and system maintenance when original inventory becomes unavailable or when transitioning to active product lines.

Substiute Parts

ATXMEGA64A4-MU

Microchip TechnologyIn Stock: 933ATXMEGA64A4-MU Datasheet

Current PartRFQ

ATXMEGA32A4-MH

Microchip TechnologyIn Stock: 18243ATXMEGA32A4-MH Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ATXMEGA64A4-MU is determined by compatibility across the following critical parameters:

Mandatory Compatibility Parameters:

• Manufacturer: Microchip Technology
• Series: AVR® XMEGA® A4
• Core Processor: AVR
• Core Size: 8/16-Bit
• Operating Speed: 32MHz
• Package Type: 44-VQFN (7x7) Exposed Pad
• Mounting Type: Surface Mount
• Supply Voltage Range: 1.6V ~ 3.6V
• Connectivity: I2C, IrDA, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, DMA, POR, PWM, WDT
• Data Converters: A/D 12x12b; D/A 2x12b
• Operating Temperature: -40°C ~ 85°C

Variable Parameters (Allowable Differences):

• Program Memory Size
• EEPROM Size
• RAM Size
• I/O Count
• Part Status
• Compliance certifications

The ATXMEGA32A4-MH qualifies as a substitute part. While it features reduced program memory (32KB versus 64KB), EEPROM (1K x 8 versus 2K x 8), and maintains identical core functionality, speed, package, and connectivity specifications. This part is active in production status, providing long-term availability.

Parameter Comparison

Engineering Selection Recommendations

ATXMEGA32A4-MH as Primary Substitute:

The ATXMEGA32A4-MH is the qualified substitute for the obsolete ATXMEGA64A4-MU. Both parts share identical core architecture, processing speed, package footprint, and peripheral integration. The primary difference is reduced program memory capacity (32KB versus 64KB) and EEPROM storage (1K x 8 versus 2K x 8).

Compliance and Status Advantages:

The ATXMEGA32A4-MH holds active product status with Microchip Technology, ensuring continued manufacturing support, availability, and compliance maintenance. Both parts maintain ROHS3 compliance and REACH unaffected status. The substitute part carries verified programmability certification through DiGi-Electronics.

Selection Criteria:

Selection of the ATXMEGA32A4-MH is appropriate when:

• Application firmware and data storage requirements fit within 32KB program memory and 1K EEPROM
• Long-term component availability and supply chain continuity are required
• Design migration from obsolete to active product lines is planned
• Identical pin configuration and package footprint are required for PCB compatibility

Selection of the ATXMEGA64A4-MU is limited to existing inventory applications where the additional 32KB program memory and 1K EEPROM are mandatory and no redesign is feasible.

Frequently Asked Questions (FAQ)

Q: Can the ATXMEGA32A4-MH directly replace the ATXMEGA64A4-MU in existing designs?

A: Direct replacement is possible from a hardware perspective. Both parts use identical 44-VQFN (7x7) packages with matching pinouts, supply voltage ranges, and peripheral configurations. However, firmware and application data must fit within the reduced memory capacity of the ATXMEGA32A4-MH (32KB program memory and 1K EEPROM versus 64KB and 2K respectively).

Q: What are the memory differences between these parts?

A: The ATXMEGA64A4-MU provides 64KB (32K x 16) FLASH program memory and 2K x 8 EEPROM. The ATXMEGA32A4-MH provides 32KB (16K x 16) FLASH program memory and 1K x 8 EEPROM. RAM capacity remains identical at 4K x 8 in both parts.

Q: Are the package dimensions and pin configurations identical?

A: Yes. Both parts use the 44-VQFN (7x7) surface mount package with exposed pad. Pin configuration, I/O count (34 pins), and PCB footprint are identical, enabling direct socket compatibility.

Q: What is the availability status difference between these parts?

A: The ATXMEGA64A4-MU is classified as obsolete with limited remaining inventory. The ATXMEGA32A4-MH is active in production, providing long-term availability and supply chain continuity.

Q: Do both parts support the same communication interfaces?

A: Yes. Both the ATXMEGA64A4-MU and ATXMEGA32A4-MH support identical connectivity: I2C, IrDA, SPI, and UART/USART. Peripheral integration including Brown-out Detect/Reset, DMA, POR, PWM, and WDT are identical.

Q: Are there differences in data converter specifications?

A: No. Both parts feature identical analog-to-digital conversion (A/D 12x12b) and digital-to-analog conversion (D/A 2x12b) capabilities.

Q: What operating temperature range do these parts support?

A: Both parts operate across the identical temperature range of -40°C to 85°C (TA).

Q: Are both parts RoHS compliant?

A: Yes. Both the ATXMEGA64A4-MU and ATXMEGA32A4-MH are ROHS3 compliant and REACH unaffected.