ATMEGA323L-4AI Equivalent & Substitute Parts

Part Overview

The ATMEGA323L-4AI is an 8-bit AVR microcontroller manufactured by Microchip Technology, featuring 32KB FLASH memory, 2KB RAM, and 1KB EEPROM. Operating at 4MHz with a supply voltage range of 2.7V to 5.5V, this device is housed in a 44-TQFP package. The product is classified as Obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	ATMEGA323L-4AI
Manufacturer	Microchip Technology
Core Processor	AVR
Core Size	8-Bit
Speed	4MHz
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	32
Data Converters	A/D 8x10b
Connectivity	I2C, SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT
Package / Case	44-TQFP (10x10)
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 85°C
Product Status	Obsolete
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution for the ATMEGA323L-4AI is determined by the following critical parameters:

Core Processor Architecture: AVR processor family
Core Size: 8-Bit
Program Memory: 32KB FLASH (16K x 16)
EEPROM Size: 1K x 8
RAM Size: 2K x 8
Package: 44-TQFP (10x10)
Number of I/O: 32 pins
Connectivity: I2C, SPI, UART/USART support
Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
Data Converters: A/D 8x10b
Operating Temperature Range: -40°C ~ 85°C

The substitute parts ATMEGA324PA-AU and ATMEGA32L-8AU maintain identical memory configurations, I/O count, peripheral set, package form factor, and operating temperature range. Variations in operating speed (4MHz vs. 8MHz vs. 20MHz) and supply voltage ranges are within acceptable substitution parameters for this product category, as they represent enhanced or compatible variants of the same microcontroller family.

Parameter Comparison

Parameter	ATMEGA323L-4AI	ATMEGA32L-8AU	ATMEGA324PA-AU
Manufacturer	Microchip Technology	Microchip Technology	Microchip Technology
Core Processor	AVR	AVR	AVR
Core Size	8-Bit	8-Bit	8-Bit
Speed	4MHz	8MHz	20MHz
Program Memory Size	32KB (16K x 16)	32KB (16K x 16)	32KB (16K x 16)
Program Memory Type	FLASH	FLASH	FLASH
EEPROM Size	1K x 8	1K x 8	1K x 8
RAM Size	2K x 8	2K x 8	2K x 8
Voltage - Supply (Vcc/Vdd)	2.7V ~ 5.5V	2.7V ~ 5.5V	1.8V ~ 5.5V
Number of I/O	32	32	32
Data Converters	A/D 8x10b	A/D 8x10b	A/D 8x10b
Connectivity	I2C, SPI, UART/USART	I2C, SPI, UART/USART	I2C, SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT	Brown-out Detect/Reset, POR, PWM, WDT	Brown-out Detect/Reset, POR, PWM, WDT
Package / Case	44-TQFP (10x10)	44-TQFP (10x10)	44-TQFP (10x10)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

ATMEGA32L-8AU is suitable for applications requiring the original 2.7V to 5.5V supply voltage range with doubled operating speed (8MHz). This part maintains full compatibility with the ATMEGA323L-4AI pinout and memory architecture while offering Active product status and ROHS3 compliance.

ATMEGA324PA-AU is suitable for applications requiring extended supply voltage range (1.8V to 5.5V) and maximum operating speed (20MHz). This part provides the highest performance variant with Active product status and ROHS3 compliance. The extended voltage range enables operation in low-power applications.

Both substitute parts are Active products with ROHS3 compliance, addressing the Obsolete status and RoHS non-compliance of the original ATMEGA323L-4AI.

Frequently Asked Questions (FAQ)

Q: Can ATMEGA32L-8AU and ATMEGA324PA-AU be used interchangeably with ATMEGA323L-4AI?

A: Both parts share identical pinout (44-TQFP), memory configuration (32KB FLASH, 2KB RAM, 1KB EEPROM), I/O count (32), and peripheral set. They are pin-compatible and functionally compatible. Operating speed differences (4MHz, 8MHz, 20MHz) do not prevent substitution; applications designed for 4MHz operation function correctly at higher speeds.

Q: What is the primary difference between ATMEGA32L-8AU and ATMEGA324PA-AU?

A: The ATMEGA32L-8AU operates at 8MHz with a 2.7V to 5.5V supply range. The ATMEGA324PA-AU operates at 20MHz with an extended 1.8V to 5.5V supply range. Both maintain identical memory and I/O specifications.

Q: Are there packaging differences between these parts?

A: All three parts use 44-TQFP (10x10) surface mount packaging. No package conversion is required for substitution.

Q: Why is the original ATMEGA323L-4AI classified as Obsolete?

A: The ATMEGA323L-4AI is an older generation AVR microcontroller. Microchip Technology has transitioned to newer variants such as ATMEGA32L and ATMEGA324PA, which offer improved specifications and compliance certifications.

Q: Do the substitute parts meet current RoHS requirements?

A: Yes. Both ATMEGA32L-8AU and ATMEGA324PA-AU are ROHS3 compliant, whereas the original ATMEGA323L-4AI is RoHS non-compliant.

Q: What is the Moisture Sensitivity Level (MSL) for these parts?

A: All three parts have MSL 3 (168 Hours), indicating identical moisture handling requirements during storage and assembly.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message