ATMEGA2561-16AI Equivalent & Substitute Parts

Part Overview

The ATMEGA2561-16AI is an 8-bit AVR microcontroller manufactured by Microchip Technology, featuring 256KB of FLASH program memory, 8KB of RAM, and 4KB of EEPROM. This device operates at 16MHz with a 64-pin TQFP package and supports multiple communication interfaces including SPI, I2C, and UART/USART. The part is currently classified as obsolete, making identification of compatible substitutes essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Core Processor	AVR
Core Size	8-Bit
Speed	16MHz
Program Memory Size	256KB (128K x 16)
Program Memory Type	FLASH
RAM Size	8K x 8
EEPROM Size	4K x 8
Number of I/O	54
Voltage Supply (Vcc/Vdd)	4.5V ~ 5.5V
Data Converters	A/D 8x10b
Connectivity	EBI/EMI, I2C, SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	64-TQFP (14x14)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution of the ATMEGA2561-16AI is determined by strict equivalence across the following critical parameters:

Core Architecture: AVR processor family
Memory Configuration: 256KB FLASH, 8KB RAM, 4KB EEPROM
Clock Speed: 16MHz operation
I/O Count: 54 pins
Package Format: 64-pin TQFP (14x14mm)
Voltage Range: 4.5V to 5.5V supply
Peripheral Set: Identical connectivity and feature support

The ATMEGA2561-16AU meets all these criteria and qualifies as a direct substitute. The primary distinction between these parts is packaging format and product lifecycle status rather than functional or electrical characteristics.

Parameter Comparison

Parameter	ATMEGA2561-16AI	ATMEGA2561-16AU
Manufacturer	Microchip Technology	Microchip Technology
Core Processor	AVR	AVR
Core Size	8-Bit	8-Bit
Speed	16MHz	16MHz
Program Memory Size	256KB (128K x 16)	256KB (128K x 16)
RAM Size	8K x 8	8K x 8
EEPROM Size	4K x 8	4K x 8
Number of I/O	54	54
Voltage Supply (Vcc/Vdd)	4.5V ~ 5.5V	4.5V ~ 5.5V
Data Converters	A/D 8x10b	A/D 8x10b
Connectivity	EBI/EMI, I2C, SPI, UART/USART	EBI/EMI, 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)
Package / Case	64-TQFP (14x14)	64-TQFP (14x14)
Mounting Type	Surface Mount	Surface Mount
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

The ATMEGA2561-16AU is the appropriate substitute for the obsolete ATMEGA2561-16AI. Both devices share identical electrical specifications, memory architecture, and peripheral functionality. The ATMEGA2561-16AU maintains active product status with Microchip Technology, ensuring continued availability and support.

The ATMEGA2561-16AU carries ROHS3 compliance certification, whereas the ATMEGA2561-16AI is non-compliant. This distinction is significant for applications subject to regulatory requirements or procurement policies mandating RoHS compliance. Both parts maintain equivalent REACH status and ECCN classification.

Packaging format differs only in supplier delivery method: the ATMEGA2561-16AI uses tube packaging while the ATMEGA2561-16AU uses tray packaging. This distinction affects handling and storage procedures but does not impact functional performance or electrical characteristics.

Frequently Asked Questions (FAQ)

Q: Are the ATMEGA2561-16AI and ATMEGA2561-16AU electrically identical?

A: Yes. Both devices feature identical core architecture, memory configuration, clock speed, I/O count, voltage specifications, and peripheral sets. Electrical performance and functional capability are equivalent.

Q: What is the primary reason to substitute the ATMEGA2561-16AI?

A: The ATMEGA2561-16AI is classified as obsolete. The ATMEGA2561-16AU is an active product with ongoing manufacturer support and availability.

Q: Does the packaging difference affect circuit design or PCB layout?

A: No. Both parts use the same 64-pin TQFP (14x14mm) package format. PCB footprints, pin assignments, and layout requirements are identical. The packaging difference refers only to supplier delivery method (tube versus tray).

Q: Is RoHS compliance a functional difference?

A: No. RoHS compliance is a material composition and manufacturing process specification, not a functional characteristic. The ATMEGA2561-16AU meets ROHS3 standards while the ATMEGA2561-16AI does not. Selection depends on regulatory or procurement requirements specific to your application.

Q: Can I use the ATMEGA2561-16AU as a direct replacement in existing designs?

A: Yes. The ATMEGA2561-16AU is a direct functional and electrical equivalent. No design modifications, firmware changes, or PCB alterations are required.

Q: Are there any differences in moisture sensitivity handling?

A: No. Both parts carry identical MSL rating of 3 (168 Hours), requiring equivalent storage and handling procedures.

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