ATMEGA645V-8AI Equivalent & Substitute Parts

Part Overview

The ATMEGA645V-8AI 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, an 8-channel 10-bit analog-to-digital converter, and communication interfaces including SPI, UART/USART, and USI. The part is classified as obsolete, making identification of active equivalent components essential for new designs and production continuity.

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	1.8V ~ 5.5V
Data Converters	A/D 8x10b
Connectivity	SPI, UART/USART, USI
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT
Operating Temperature	-40°C ~ 85°C
Package / Case	64-TQFP (14x14)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution of the ATMEGA645V-8AI is determined by strict equivalence across the following critical parameters:

Core Architecture: AVR processor family
Memory Configuration: 64KB FLASH, 4KB RAM, 2KB EEPROM
I/O Count: 53 pins
Operating Frequency: 8MHz
Voltage Range: 1.8V ~ 5.5V
Package: 64-TQFP (14x14) surface mount
Peripheral Set: SPI, UART/USART, USI, ADC, PWM, WDT, Brown-out Detect/Reset, POR

The ATMEGA645V-8AU meets all these criteria and serves as a direct functional equivalent. The primary distinction is product status: the original part is obsolete, while the substitute is active in production.

Parameter Comparison

Parameter	ATMEGA645V-8AI	ATMEGA645V-8AU
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	1.8V ~ 5.5V	1.8V ~ 5.5V
Data Converters	A/D 8x10b	A/D 8x10b
Connectivity	SPI, UART/USART, USI	SPI, UART/USART, USI
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT	Brown-out Detect/Reset, POR, PWM, WDT
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
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
REACH Status	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

The ATMEGA645V-8AU is the appropriate selection for applications currently using or specifying the ATMEGA645V-8AI. Both devices are electrically and functionally identical across all operational parameters. The substitute part offers the following advantages:

Active Production Status: The ATMEGA645V-8AU is in active production, ensuring long-term availability and supply chain stability.
Regulatory Compliance: The substitute meets ROHS3 compliance requirements, whereas the original part does not.
Inventory Availability: The substitute part maintains significantly higher stock levels (2432 units versus 934 units).

Pin-to-pin compatibility, memory configuration, peripheral functionality, and package dimensions are identical. No circuit modifications or firmware changes are required for substitution.

Frequently Asked Questions (FAQ)

Q: Are the ATMEGA645V-8AI and ATMEGA645V-8AU pin-compatible?

A: Yes. Both devices use the 64-TQFP (14x14) package with identical pin assignments, voltage ratings, and I/O configurations.

Q: Can I use the ATMEGA645V-8AU as a direct replacement in existing designs?

A: Yes. The substitute part is functionally equivalent across all electrical and mechanical parameters. No PCB redesign or firmware modification is necessary.

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

A: The primary differences are product status (obsolete versus active) and RoHS compliance (non-compliant versus ROHS3 compliant). All functional specifications are identical.

Q: Are there any temperature or voltage rating differences?

A: No. Both parts operate across the identical voltage range (1.8V ~ 5.5V) and temperature range (-40°C ~ 85°C).

Q: Which part should I specify for new designs?

A: Specify the ATMEGA645V-8AU for new designs. This part is in active production and meets current regulatory requirements.

Q: Is the package size the same?

A: Yes. Both parts use the 64-TQFP (14x14) surface mount package with identical footprint and pinout.

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