ATMEGA325V-8AI Equivalent & Substitute Parts

Part Overview

The ATMEGA325V-8AI is an 8-bit AVR microcontroller manufactured by Microchip Technology, featuring 32KB FLASH memory, 2KB RAM, and 1KB EEPROM. This device operates at 8MHz with a supply voltage range of 1.8V to 5.5V and is housed in a 64-TQFP package. The part is classified as obsolete, making identification of suitable substitutes essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Core Processor	AVR
Core Size	8-Bit
Speed	8MHz
Program Memory Size	32KB (16K x 16)
Program Memory Type	FLASH
EEPROM Size	1K x 8
RAM Size	2K x 8
Voltage - Supply (Vcc/Vdd)	1.8V ~ 5.5V
Number of I/O	54
Data Converters	A/D 8x10b
Connectivity	SPI, UART/USART, USI
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 ATMEGA325V-8AI is determined by strict equivalence across the following critical parameters:

Core processor architecture (AVR)
Core size (8-Bit)
Operating frequency (8MHz)
Memory configuration (32KB FLASH, 2KB RAM, 1KB EEPROM)
I/O count (54 pins)
Peripheral set (SPI, UART/USART, USI, Brown-out Detect/Reset, POR, PWM, WDT)
Analog-to-digital converter specification (8x10-bit)
Package type and pin count (64-TQFP)
Supply voltage range (1.8V ~ 5.5V)
Operating temperature range (-40°C ~ 85°C)

The ATMEGA325V-8AU meets all these criteria and is therefore a direct functional equivalent.

Parameter Comparison

Parameter	ATMEGA325V-8AI	ATMEGA325V-8AU	Match
Manufacturer	Microchip Technology	Microchip Technology	✓
Core Processor	AVR	AVR	✓
Core Size	8-Bit	8-Bit	✓
Speed	8MHz	8MHz	✓
Program Memory Size	32KB (16K x 16)	32KB (16K x 16)	✓
Program Memory Type	FLASH	FLASH	✓
EEPROM Size	1K x 8	1K x 8	✓
RAM Size	2K x 8	2K x 8	✓
Voltage - Supply (Vcc/Vdd)	1.8V ~ 5.5V	1.8V ~ 5.5V	✓
Number of I/O	54	54	✓
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 (TA)	-40°C ~ 85°C (TA)	✓
Package / Case	64-TQFP (14x14)	64-TQFP (14x14)	✓
Mounting Type	Surface Mount	Surface Mount	✓
Product Status	Obsolete	Active	Substitute is active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Substitute is compliant

Engineering Selection Recommendations

The ATMEGA325V-8AU is a direct functional substitute for the ATMEGA325V-8AI. Both devices share identical electrical specifications, memory configuration, peripheral set, and package format. The primary distinction is product status and regulatory compliance: the ATMEGA325V-8AU is classified as active and meets ROHS3 compliance requirements, whereas the ATMEGA325V-8AI is obsolete and RoHS non-compliant.

For new designs or production continuity where the ATMEGA325V-8AI is no longer available, the ATMEGA325V-8AU provides equivalent functionality without design modification. The difference in packaging (Tray for ATMEGA325V-8AU versus unspecified for ATMEGA325V-8AI) does not affect electrical or mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: Can ATMEGA325V-8AU be used as a direct replacement for ATMEGA325V-8AI?

A: Yes. Both devices are electrically and mechanically identical. All electrical parameters, memory specifications, peripheral configurations, and package dimensions match exactly. No circuit modifications are required.

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

A: The ATMEGA325V-8AU is the active production variant with ROHS3 compliance. The ATMEGA325V-8AI is obsolete. The suffix difference (-8AU versus -8AI) reflects packaging and compliance status, not functional capability.

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

A: No. Both parts use the identical 64-TQFP (14x14) package with 54 I/O pins. PCB footprints, pin assignments, and mechanical dimensions are identical.

Q: Does the supply voltage range remain the same?

A: Yes. Both devices operate across the identical supply voltage range of 1.8V to 5.5V (Vcc/Vdd).

Q: Is the operating temperature range affected?

A: No. Both devices maintain the same operating temperature range of -40°C to 85°C (TA).

Q: What about memory specifications?

A: Memory configuration is identical: 32KB FLASH, 2KB RAM, and 1KB EEPROM in both devices.

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