ATMEGA325-16AI Equivalent & Substitute Parts

Part Overview

The ATMEGA325-16AI is an 8-bit AVR microcontroller manufactured by Microchip Technology, featuring 32KB FLASH memory, 2KB RAM, and 1KB EEPROM. This device operates at 16MHz with a supply voltage range of 2.7V to 5.5V and is housed in a 64-TQFP package. The ATMEGA325-16AI is 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	32KB (16K x 16)
Program Memory Type	FLASH
EEPROM Size	1K x 8
RAM Size	2K x 8
Voltage - Supply (Vcc/Vdd)	2.7V ~ 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 ATMEGA325-16AI is determined by strict equivalence across all electrical and mechanical parameters. The substitute part must maintain identical specifications for core processor architecture, memory configuration, I/O count, peripheral set, voltage supply range, operating temperature range, and physical package dimensions.

The ATMEGA325-16AU qualifies as a direct substitute based on the following matching parameters:

Core Processor: AVR (identical)
Core Size: 8-Bit (identical)
Speed: 16MHz (identical)
Program Memory: 32KB FLASH (identical)
EEPROM: 1K x 8 (identical)
RAM: 2K x 8 (identical)
Voltage Supply: 2.7V ~ 5.5V (identical)
Number of I/O: 54 (identical)
Data Converters: A/D 8x10b (identical)
Connectivity: SPI, UART/USART, USI (identical)
Peripherals: Brown-out Detect/Reset, POR, PWM, WDT (identical)
Operating Temperature: -40°C ~ 85°C (identical)
Package: 64-TQFP (14x14) (identical)
Mounting Type: Surface Mount (identical)

Parameter Comparison

Parameter	ATMEGA325-16AI	ATMEGA325-16AU
Manufacturer	Microchip Technology	Microchip Technology
Core Processor	AVR	AVR
Core Size	8-Bit	8-Bit
Speed	16MHz	16MHz
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)	2.7V ~ 5.5V	2.7V ~ 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
RoHS Status	RoHS non-compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)
REACH Status	REACH Unaffected	REACH Unaffected
ECCN	EAR99	EAR99
HTSUS	8542.31.0001	8542.31.0001

Engineering Selection Recommendations

The ATMEGA325-16AU is the direct functional equivalent of the ATMEGA325-16AI. Both devices share identical electrical specifications, memory configuration, I/O architecture, and physical packaging. The primary distinction lies in product lifecycle status and regulatory compliance.

The ATMEGA325-16AI is classified as obsolete, whereas the ATMEGA325-16AU maintains active product status with current manufacturing support. The ATMEGA325-16AU achieves ROHS3 compliance, whereas the ATMEGA325-16AI is RoHS non-compliant. Both devices maintain identical moisture sensitivity levels and regulatory classifications under REACH and ECCN standards.

For new designs or system replacements, the ATMEGA325-16AU is the appropriate selection due to active availability and enhanced regulatory compliance. The electrical and mechanical compatibility ensures direct substitution without circuit modification or firmware revision.

Frequently Asked Questions (FAQ)

Q: Can the ATMEGA325-16AU directly replace the ATMEGA325-16AI in existing designs?

A: Yes. The ATMEGA325-16AU is electrically and mechanically identical to the ATMEGA325-16AI. All electrical parameters, memory specifications, I/O configuration, and package dimensions are equivalent. Direct substitution is possible without circuit redesign or firmware modification.

Q: What is the difference between the ATMEGA325-16AI and ATMEGA325-16AU?

A: The devices are functionally identical. The primary differences are product status (ATMEGA325-16AI is obsolete; ATMEGA325-16AU is active) and RoHS compliance (ATMEGA325-16AI is non-compliant; ATMEGA325-16AU is ROHS3 compliant). Packaging differs only in supplier format (ATMEGA325-16AI uses standard packaging; ATMEGA325-16AU is supplied in Tray).

Q: Are there any pin compatibility concerns when substituting these parts?

A: No. Both devices use the 64-TQFP (14x14) package with identical pinout and I/O configuration. Pin-to-pin compatibility is complete.

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

A: Both the ATMEGA325-16AI and ATMEGA325-16AU have a Moisture Sensitivity Level (MSL) of 3, with a floor life of 168 hours. Standard moisture control procedures apply during storage and handling.

Q: Are there supply voltage or operating temperature differences?

A: No. Both devices operate across the identical voltage range of 2.7V to 5.5V and the same temperature range of -40°C to 85°C (TA).

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