ATMEGA329A-MUR Equivalent & Substitute Parts

Part Overview

The ATMEGA329A-MUR is an 8-bit AVR microcontroller from Microchip Technology's ATmega series, featuring 32KB FLASH memory, 2KB RAM, and 1KB EEPROM. This Surface Mount device operates at 20MHz with integrated peripherals including SPI, UART/USART, and USI connectivity. The component is Active in product status and widely used in embedded applications requiring moderate processing capability and memory capacity. Identifying equivalent substitute parts ensures design flexibility, supply chain continuity, and procurement optimization when the primary part becomes unavailable or when alternative packaging options are required.

Key Parameters

Parameter	Value
Core Processor	AVR
Core Size	8-Bit
Speed	20MHz
Program Memory Size	32KB (16K x 16)
Program Memory Type	FLASH
RAM Size	2K x 8
EEPROM Size	1K x 8
Voltage Supply (Vcc/Vdd)	1.8V ~ 5.5V
Number of I/O	54
Data Converters	A/D 8x10b
Connectivity	SPI, UART/USART, USI
Peripherals	Brown-out Detect/Reset, LCD, POR, PWM, WDT
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	64-VFQFN Exposed Pad
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitute parts for the ATMEGA329A-MUR are determined by strict equivalence across all critical electrical and mechanical parameters. The substitution logic is based on matching the following parameters:

Core processor architecture (AVR)
Core size (8-Bit)
Operating frequency (20MHz)
Memory configuration (32KB FLASH, 2KB RAM, 1KB EEPROM)
I/O count (54 pins)
Voltage supply range (1.8V ~ 5.5V)
Connectivity interfaces (SPI, UART/USART, USI)
Peripheral feature set (Brown-out Detect/Reset, LCD, POR, PWM, WDT)
Data converter specifications (A/D 8x10b)
Operating temperature range (-40°C ~ 85°C)
Package type (64-VFQFN Exposed Pad)
Compliance certifications (ROHS3, REACH Unaffected)

Parts meeting all these criteria are classified as parametric equivalents and direct substitutes.

Parameter Comparison

Parameter	ATMEGA329A-MUR	ATMEGA329PA-MUR
Manufacturer	Microchip Technology	Microchip Technology
Series	AVR® ATmega	AVR® ATmega
Core Processor	AVR	AVR
Core Size	8-Bit	8-Bit
Speed	20MHz	20MHz
Program Memory Size	32KB (16K x 16)	32KB (16K x 16)
Program Memory Type	FLASH	FLASH
RAM Size	2K x 8	2K x 8
EEPROM Size	1K x 8	1K x 8
Voltage - Supply (Vcc/Vdd)	1.8V ~ 5.5V	1.8V ~ 5.5V
Number of I/O	54	54
Data Converters	A/D 8x10b	A/D 8x10b
Connectivity	SPI, UART/USART, USI	SPI, UART/USART, USI
Peripherals	Brown-out Detect/Reset, LCD, POR, PWM, WDT	Brown-out Detect/Reset, LCD, POR, PWM, WDT
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount	Surface Mount
Supplier Device Package	64-QFN (9x9)	64-QFN (9x9)
Package / Case	64-VFQFN Exposed Pad	64-VFQFN Exposed Pad
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)
REACH Status	REACH Unaffected	REACH Unaffected
Product Status	Active	Active

Engineering Selection Recommendations

The ATMEGA329PA-MUR is a direct parametric equivalent to the ATMEGA329A-MUR. Both components share identical electrical specifications, memory configurations, peripheral feature sets, and operating characteristics. Both parts maintain Active product status from Microchip Technology, ensuring continued availability and support. Both components comply with ROHS3 requirements and are REACH Unaffected, meeting current environmental and regulatory standards. The primary distinction between these parts is packaging availability: the ATMEGA329PA-MUR is available in Cut Tape (CT) and Digi-Reel® packaging options, offering greater procurement flexibility compared to the standard packaging of the ATMEGA329A-MUR. Selection between these equivalents should be based on packaging requirements and supply chain availability rather than technical performance considerations.

Frequently Asked Questions (FAQ)

Q: Can ATMEGA329PA-MUR be used as a direct replacement for ATMEGA329A-MUR in existing designs?

A: Yes. The ATMEGA329PA-MUR is a parametric equivalent with identical electrical specifications, memory configuration, I/O count, peripheral features, and package dimensions. No design modifications are required for substitution.

Q: What is the difference between ATMEGA329A-MUR and ATMEGA329PA-MUR?

A: The components are electrically and functionally identical. The primary difference is packaging format: ATMEGA329PA-MUR is available in Cut Tape (CT) and Digi-Reel® packaging, while ATMEGA329A-MUR uses standard packaging. Both use the same 64-VFQFN Exposed Pad package type.

Q: Are there any pin compatibility concerns when substituting these parts?

A: No. Both parts use the 64-VFQFN Exposed Pad package with identical pin assignments, pinout, and mechanical dimensions (9x9mm). Pin-for-pin compatibility is guaranteed.

Q: Do both parts support the same operating voltage range?

A: Yes. Both ATMEGA329A-MUR and ATMEGA329PA-MUR operate across the identical voltage supply range of 1.8V to 5.5V, ensuring compatibility in all power supply configurations.

Q: Are moisture sensitivity levels the same for both parts?

A: Yes. Both components have Moisture Sensitivity Level (MSL) 3 with a 168-hour floor life requirement. Identical handling and storage procedures apply to both parts.

Q: Do both parts meet the same compliance standards?

A: Yes. Both ATMEGA329A-MUR and ATMEGA329PA-MUR are ROHS3 Compliant and REACH Unaffected, meeting identical environmental and regulatory requirements.

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