ATMEGA649V-8AI Equivalent & Substitute Parts

Part Overview

The ATMEGA649V-8AI is an 8-bit AVR microcontroller from Microchip Technology's ATmega series, featuring 64KB FLASH memory, 4KB RAM, and 2KB EEPROM. Designed for embedded applications requiring moderate processing capability and integrated peripherals including SPI, UART/USART, and USI connectivity. The device operates at 8MHz with a supply voltage range of 1.8V to 5.5V and includes integrated analog-to-digital conversion (8x10-bit), PWM, watchdog timer, and LCD driver support.

The ATMEGA649V-8AI is classified as obsolete. Identifying equivalent substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support long-term product availability for existing applications.

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
Voltage - Supply (Vcc/Vdd)	1.8V ~ 5.5V
Data Converters	A/D 8x10b
Number of I/O	53
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-TQFP (14x14)

Substitute Part Grouping Explanation

Substitution of the ATMEGA649V-8AI 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: 8MHz
Supply Voltage Range: 1.8V ~ 5.5V
Peripheral Set: SPI, UART/USART, USI, LCD driver, PWM, WDT, Brown-out Detect/Reset, POR
I/O Count: 53 pins
Data Conversion: 8-channel 10-bit ADC
Package: 64-TQFP (14x14)
Mounting: Surface Mount

The ATMEGA649V-8AU meets all substitution criteria. Both parts share identical electrical specifications, memory architecture, peripheral functionality, and physical packaging. The primary difference is product status and packaging format (Tray vs. standard packaging).

Parameter Comparison

Parameter	ATMEGA649V-8AI	ATMEGA649V-8AU	Match
Manufacturer	Microchip Technology	Microchip Technology	✓
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	✓
Voltage - Supply (Vcc/Vdd)	1.8V ~ 5.5V	1.8V ~ 5.5V	✓
Data Converters	A/D 8x10b	A/D 8x10b	✓
Number of I/O	53	53	✓
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	✓
Package / Case	64-TQFP (14x14)	64-TQFP (14x14)	✓
Product Status	Obsolete	Active	—
RoHS Status	RoHS non-compliant	ROHS3 Compliant	—

Engineering Selection Recommendations

The ATMEGA649V-8AU is a direct functional equivalent to the ATMEGA649V-8AI. Both devices are pin-compatible and electrically identical across all specified parameters.

Product Status Consideration: The ATMEGA649V-8AI is classified as obsolete, while the ATMEGA649V-8AU maintains active product status. For new designs or ongoing production requiring long-term component availability, the ATMEGA649V-8AU is the appropriate selection.

Compliance Consideration: The ATMEGA649V-8AU is ROHS3 compliant, whereas the ATMEGA649V-8AI is RoHS non-compliant. Applications subject to RoHS regulatory requirements must use the ATMEGA649V-8AU.

Packaging Format: The ATMEGA649V-8AU is supplied in Tray packaging. Verify packaging compatibility with assembly and storage requirements.

Frequently Asked Questions (FAQ)

Q: Are ATMEGA649V-8AI and ATMEGA649V-8AU pin-compatible?

A: Yes. Both devices use the 64-TQFP (14x14) package with identical pin assignments, electrical characteristics, and functional specifications. Direct PCB substitution is supported without design modification.

Q: What is the difference between ATMEGA649V-8AI and ATMEGA649V-8AU?

A: The devices are functionally and electrically identical. Differences are limited to product status (Obsolete vs. Active) and RoHS compliance status (non-compliant vs. ROHS3 compliant). The ATMEGA649V-8AU is the active production equivalent.

Q: Can I use ATMEGA649V-8AU in place of ATMEGA649V-8AI in existing designs?

A: Yes. The ATMEGA649V-8AU is a direct substitute. No firmware, software, or hardware modifications are required. Existing firmware compiled for the ATMEGA649V-8AI will execute identically on the ATMEGA649V-8AU.

Q: Why is the ATMEGA649V-8AI obsolete?

A: Product obsolescence is determined by the manufacturer. The ATMEGA649V-8AU represents the current active production equivalent and is the recommended selection for all new and ongoing applications.

Q: Are there memory or performance differences between these parts?

A: No. Both devices feature identical 64KB FLASH, 4KB RAM, 2KB EEPROM, 8MHz operation, and peripheral configurations. Performance and memory capacity are equivalent.

Q: What packaging options are available for the substitute part?

A: The ATMEGA649V-8AU is supplied in Tray packaging. Confirm packaging compatibility with your assembly process and storage infrastructure.

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