ATMEGA64L-8MC Equivalent & Substitute Parts

Part Overview

The ATMEGA64L-8MC is an 8-bit AVR microcontroller from Microchip Technology's ATmega series, featuring 64KB FLASH memory, 4KB RAM, and 2KB EEPROM. This device integrates 53 I/O pins, multiple communication interfaces (I2C, SPI, UART/USART), and analog-to-digital conversion capabilities in a 64-QFN surface mount package.

The ATMEGA64L-8MC is classified as obsolete. Identifying equivalent substitute parts is necessary to support legacy system maintenance, design updates, and procurement continuity when original inventory becomes unavailable.

Key Parameters

Parameter	Value
Core Processor	AVR
Core Size	8-Bit
Speed	8MHz
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	53
Voltage Supply Range	2.7V ~ 5.5V
Data Converters	A/D 8x10b
Connectivity	I2C, SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT
Mounting Type	Surface Mount
Package	64-QFN (9x9)

Substitute Part Grouping Explanation

Substitution of the ATMEGA64L-8MC is determined by strict equivalence across the following critical parameters:

Core processor architecture (AVR)
Memory configuration (64KB FLASH, 4KB RAM, 2KB EEPROM)
I/O pin count (53)
Operating voltage range (2.7V ~ 5.5V)
Communication interfaces (I2C, SPI, UART/USART)
Peripheral feature set (Brown-out Detect/Reset, POR, PWM, WDT)
Package type and pin count (64-QFN 9x9)
Data converter specifications (A/D 8x10b)

The ATMEGA64L-8MU meets all these criteria and qualifies as a direct substitute. Differences in operating temperature range, product status, and compliance certifications do not affect functional or electrical compatibility at the component level.

Parameter Comparison

Parameter	ATMEGA64L-8MC	ATMEGA64L-8MU
Manufacturer	Microchip Technology	Microchip Technology
Series	AVR® ATmega	AVR® ATmega
Core Processor	AVR	AVR
Core Size	8-Bit	8-Bit
Speed	8MHz	8MHz
Program Memory Size	64KB (32K x 16)	64KB (32K x 16)
Program Memory Type	FLASH	FLASH
EEPROM Size	2K x 8	2K x 8
RAM Size	4K x 8	4K x 8
Number of I/O	53	53
Voltage Supply Range	2.7V ~ 5.5V	2.7V ~ 5.5V
Data Converters	A/D 8x10b	A/D 8x10b
Connectivity	I2C, SPI, UART/USART	I2C, SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT	Brown-out Detect/Reset, POR, PWM, WDT
Mounting Type	Surface Mount	Surface Mount
Package / Case	64-VFQFN Exposed Pad	64-VFQFN Exposed Pad
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	3 (168 Hours)

Engineering Selection Recommendations

The ATMEGA64L-8MU is the direct substitute for the ATMEGA64L-8MC. Both devices share identical core architecture, memory configuration, I/O count, and peripheral feature sets.

Selection between these parts should be based on:

Product Status: The ATMEGA64L-8MU is active and currently manufactured, ensuring long-term availability and supply chain stability. The ATMEGA64L-8MC is obsolete.
Compliance Requirements: The ATMEGA64L-8MU is ROHS3 compliant, meeting current regulatory standards. The ATMEGA64L-8MC is RoHS non-compliant.
Operating Temperature Range: The ATMEGA64L-8MU supports -40°C ~ 85°C, providing broader environmental operating conditions compared to the ATMEGA64L-8MC (0°C ~ 70°C). Applications requiring extended temperature operation should specify the ATMEGA64L-8MU.
Moisture Sensitivity: The ATMEGA64L-8MU has MSL 3 (168 hours), requiring controlled storage conditions. The ATMEGA64L-8MC has MSL 1 (unlimited). Storage and handling procedures must reflect this difference.

Frequently Asked Questions (FAQ)

Q: Are ATMEGA64L-8MC and ATMEGA64L-8MU pin-compatible?

A: Yes. Both devices use the 64-QFN (9x9) package with identical pin assignments, memory organization, and peripheral configurations. Direct PCB-level substitution is supported without layout modifications.

Q: What is the difference between the packaging designations "MC" and "MU"?

A: The "MC" suffix indicates tube packaging; the "MU" suffix indicates tray packaging. This affects only the delivery format and storage requirements, not the electrical or functional characteristics of the device.

Q: Can the ATMEGA64L-8MU be used in applications originally designed for the ATMEGA64L-8MC?

A: Yes, provided the application's operating temperature requirements fall within -40°C ~ 85°C. If the original design operated only within 0°C ~ 70°C, the ATMEGA64L-8MU is fully compatible. Applications requiring temperatures below 0°C or above 70°C must confirm compatibility with the extended range.

Q: What are the implications of the different RoHS compliance statuses?

A: The ATMEGA64L-8MC is RoHS non-compliant; the ATMEGA64L-8MU is ROHS3 compliant. New designs and systems subject to RoHS regulations must use the ATMEGA64L-8MU. Legacy systems using the ATMEGA64L-8MC may continue operation but cannot be used in new RoHS-regulated applications.

Q: How does the Moisture Sensitivity Level (MSL) difference affect handling?

A: The ATMEGA64L-8MC (MSL 1) has unlimited shelf life under standard conditions. The ATMEGA64L-8MU (MSL 3) must be stored in controlled humidity environments and has a 168-hour floor life after opening. Proper moisture-barrier packaging and baking procedures are required before soldering the ATMEGA64L-8MU.

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