ATMEGA64-16AI Equivalent & Substitute Parts

Part Overview

The ATMEGA64-16AI is an 8-bit AVR microcontroller manufactured by Microchip Technology, featuring 64KB of FLASH program memory, 4KB of RAM, and 2KB of EEPROM. This device operates at 16MHz with a 64-pin TQFP package and integrates multiple communication interfaces including I2C, SPI, and UART/USART connectivity.

The ATMEGA64-16AI is classified as obsolete. Identifying equivalent and 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	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)
Package / Case	64-TQFP (14x14)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution of the ATMEGA64-16AI is determined by strict equivalence across the following critical parameters:

Core Architecture: AVR processor family
Memory Configuration: 64KB FLASH, 4KB RAM, 2KB EEPROM
Operating Frequency: 16MHz
Electrical Specifications: 4.5V ~ 5.5V supply voltage range
Pin Count and Package: 64-pin TQFP (14x14) surface mount
Peripheral Set: I2C, SPI, UART/USART, PWM, WDT, Brown-out Detect/Reset, POR
I/O Count: 53 pins
Data Conversion: 8-channel 10-bit A/D converter
Temperature Range: -40°C ~ 85°C

The ATMEGA64-16AU meets all these criteria and is therefore a direct functional equivalent. Both parts share identical core specifications, memory architecture, and peripheral functionality. The primary difference is product status and compliance certification.

Parameter Comparison

Parameter	ATMEGA64-16AI	ATMEGA64-16AU
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)
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)
REACH Status	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

The ATMEGA64-16AU is the direct substitute for the ATMEGA64-16AI based on functional equivalence and technical specifications. Selection between these parts should be determined by the following factors:

Product Status: The ATMEGA64-16AI is obsolete, while the ATMEGA64-16AU is active. For new designs or ongoing production, the ATMEGA64-16AU is the appropriate choice due to continued manufacturer support and availability.

Compliance Certification: The ATMEGA64-16AU is ROHS3 compliant, whereas the ATMEGA64-16AI is RoHS non-compliant. Applications subject to RoHS regulations or customer requirements for compliant components must use the ATMEGA64-16AU.

Programmability Verification: The ATMEGA64-16AU is verified as programmable through DiGi-Electronics channels, providing assurance for production programming workflows.

Inventory and Supply: The ATMEGA64-16AU maintains significantly higher inventory levels (16,835 units) compared to the ATMEGA64-16AI (2,100 units), supporting consistent procurement and supply chain continuity.

Both parts are electrically and mechanically identical, ensuring direct pin-for-pin and functional compatibility in existing circuit designs.

Frequently Asked Questions (FAQ)

Q: Can the ATMEGA64-16AU be used as a direct replacement for the ATMEGA64-16AI in existing designs?

A: Yes. The ATMEGA64-16AU is a direct functional equivalent with identical core specifications, memory configuration, pin count, package type, and peripheral set. No circuit modifications are required for substitution.

Q: What is the difference between the ATMEGA64-16AI and ATMEGA64-16AU?

A: The primary differences are product status (obsolete vs. active), RoHS compliance (non-compliant vs. ROHS3 compliant), and packaging format (unspecified vs. Tray). All electrical and mechanical specifications are identical.

Q: Are there any compatibility concerns with the 64-TQFP package?

A: No. Both parts use the identical 64-pin TQFP (14x14) surface mount package. PCB footprints, soldering processes, and mechanical mounting are fully compatible.

Q: Does the ATMEGA64-16AU meet RoHS requirements?

A: Yes. The ATMEGA64-16AU is ROHS3 compliant. If your application requires RoHS-compliant components, the ATMEGA64-16AU is the appropriate selection.

Q: What is the moisture sensitivity level for these parts?

A: Both the ATMEGA64-16AI and ATMEGA64-16AU have a Moisture Sensitivity Level (MSL) of 3, with a floor life of 168 hours. Standard moisture control procedures during storage and handling are required.

Q: Are the supply voltage ranges identical?

A: Yes. Both parts operate within the 4.5V ~ 5.5V supply voltage range with identical electrical characteristics across this range.

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