ATMEGA64-16MI Equivalent & Substitute Parts

Part Overview

The ATMEGA64-16MI is an 8-bit AVR microcontroller from Microchip Technology's ATmega series, featuring 64KB of FLASH program memory, 4KB of RAM, and 2KB of EEPROM. It operates at 16MHz with integrated peripherals including I2C, SPI, and UART/USART connectivity, along with brown-out detection, power-on reset, PWM, and watchdog timer functionality. The device is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Core Processor	AVR
Core Size	8-Bit
Speed	16MHz
Program Memory Size	64KB (32K x 16)
Program Memory Type	FLASH
RAM Size	4K x 8
EEPROM Size	2K x 8
Voltage Supply (Vcc/Vdd)	4.5V ~ 5.5V
Number of I/O	53
Data Converters	A/D 8x10b
Connectivity	I2C, SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	64-VFQFN Exposed Pad

Substitute Part Grouping Explanation

Substitution of the ATMEGA64-16MI is determined by strict equivalence across core electrical and mechanical parameters. The substitute part must maintain identical specifications in the following critical areas:

Core processor architecture (AVR)
Core size (8-Bit)
Operating frequency (16MHz)
Program memory capacity and type (64KB FLASH)
RAM and EEPROM sizes (4K x 8 and 2K x 8 respectively)
Supply voltage range (4.5V ~ 5.5V)
I/O count (53 pins)
Peripheral feature set (I2C, SPI, UART/USART, brown-out detection, POR, PWM, WDT)
Data converter specifications (A/D 8x10b)
Operating temperature range (-40°C ~ 85°C)
Physical package format (64-VFQFN Exposed Pad)

The ATMEGA64-16MU meets all these criteria and qualifies as a direct functional equivalent.

Parameter Comparison

Parameter	ATMEGA64-16MI	ATMEGA64-16MU
Manufacturer	Microchip Technology	Microchip Technology
Core Processor	AVR	AVR
Core Size	8-Bit	8-Bit
Speed	16MHz	16MHz
Program Memory Size	64KB (32K x 16)	64KB (32K x 16)
Program Memory Type	FLASH	FLASH
RAM Size	4K x 8	4K x 8
EEPROM Size	2K x 8	2K x 8
Voltage Supply (Vcc/Vdd)	4.5V ~ 5.5V	4.5V ~ 5.5V
Number of I/O	53	53
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
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount	Surface Mount
Package / Case	64-VFQFN Exposed Pad	64-VFQFN Exposed Pad
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	3 (168 Hours)

Engineering Selection Recommendations

The ATMEGA64-16MU is the direct functional equivalent for the obsolete ATMEGA64-16MI. Both devices are electrically and mechanically identical across all specified parameters, ensuring pin-for-pin and code-compatible replacement.

The ATMEGA64-16MU offers additional advantages for new designs and production continuity:

Active product status ensures ongoing availability and manufacturer support
ROHS3 compliance meets current environmental and regulatory requirements
Verified programmability status through DiGi-Electronics confirms production readiness

The difference in Moisture Sensitivity Level (MSL 1 versus MSL 3) reflects standard handling and storage practices. MSL 3 requires controlled humidity storage for 168 hours prior to soldering, which is standard industry practice for surface-mount components and does not affect electrical performance or long-term reliability.

Frequently Asked Questions (FAQ)

Q: Can ATMEGA64-16MU be used as a direct replacement for ATMEGA64-16MI in existing designs?

A: Yes. The ATMEGA64-16MU is electrically and mechanically identical to the ATMEGA64-16MI. All electrical specifications, pin assignments, memory configurations, and peripheral features are equivalent. No design modifications are required.

Q: What is the difference between the two part numbers?

A: The suffix designates packaging format. The ATMEGA64-16MI uses tube packaging, while the ATMEGA64-16MU uses tray packaging. The electrical specifications and physical package dimensions remain identical.

Q: Does the RoHS compliance difference affect compatibility?

A: No. RoHS compliance is a manufacturing and environmental standard that does not affect electrical performance or functional compatibility. The ATMEGA64-16MU's ROHS3 compliance is advantageous for meeting current regulatory requirements in new production.

Q: What does MSL 3 (168 Hours) mean for handling?

A: Moisture Sensitivity Level 3 requires that the component be stored in controlled humidity conditions and used within 168 hours of exposure to ambient humidity. This is standard handling practice for surface-mount components and does not indicate reduced reliability or performance.

Q: Are there any pin-count or package dimension differences?

A: No. Both devices use the 64-VFQFN Exposed Pad package with identical pin assignments and physical dimensions. PCB layouts and footprints are fully compatible.

Q: Is firmware or software modification required when switching to ATMEGA64-16MU?

A: No. The instruction set, memory architecture, and peripheral interfaces are identical. Existing firmware requires no modification.

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