ATMEGA128-16AI Equivalent & Substitute Parts

Part Overview

The ATMEGA128-16AI is an 8-bit AVR microcontroller manufactured by Microchip Technology, featuring 128KB of FLASH program memory, 4KB EEPROM, and 4KB RAM. Operating at 16MHz with a 64-TQFP package, this device integrates comprehensive connectivity options including SPI, I2C, UART/USART, and EBI/EMI interfaces, along with integrated peripherals such as PWM, watchdog timer, and brown-out detection.

The ATMEGA128-16AI carries an Obsolete product status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production requirements for legacy systems utilizing this microcontroller.

Key Parameters

Parameter	Value
Core Processor	AVR
Core Size	8-Bit
Speed	16MHz
Program Memory Size	128KB (64K x 16)
Program Memory Type	FLASH
EEPROM Size	4K x 8
RAM Size	4K x 8
Number of I/O	53
Voltage Supply (Vcc/Vdd)	4.5V ~ 5.5V
Data Converters	A/D 8x10b
Connectivity	EBI/EMI, I2C, SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	64-TQFP (14x14)
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitute parts for the ATMEGA128-16AI are determined by strict equivalence across the following critical parameters:

Core Architecture: AVR processor family
Memory Configuration: 128KB FLASH, 4KB EEPROM, 4KB RAM
Operating Frequency: 16MHz
I/O Count: 53 pins
Supply Voltage Range: 4.5V ~ 5.5V
Package Type: 64-TQFP (14x14)
Peripheral Set: Identical connectivity and integrated functions

The identified substitute parts maintain full functional and electrical equivalence to the ATMEGA128-16AI. Differences exist only in product status, packaging format, and compliance certifications, which do not affect core microcontroller operation or pin-level compatibility.

Parameter Comparison

Parameter	ATMEGA128-16AI	ATMEGA128-16AU	ATMEGA128-16AUR
Manufacturer	Microchip Technology	Microchip Technology	Microchip Technology
Core Processor	AVR	AVR	AVR
Core Size	8-Bit	8-Bit	8-Bit
Speed	16MHz	16MHz	16MHz
Program Memory Size	128KB (64K x 16)	128KB (64K x 16)	128KB (64K x 16)
Program Memory Type	FLASH	FLASH	FLASH
EEPROM Size	4K x 8	4K x 8	4K x 8
RAM Size	4K x 8	4K x 8	4K x 8
Number of I/O	53	53	53
Voltage Supply (Vcc/Vdd)	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Data Converters	A/D 8x10b	A/D 8x10b	A/D 8x10b
Connectivity	EBI/EMI, I2C, SPI, UART/USART	EBI/EMI, I2C, SPI, UART/USART	EBI/EMI, 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
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Package / Case	64-TQFP (14x14)	64-TQFP (14x14)	64-TQFP (14x14)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	Standard	Tray	Cut Tape (CT) & Digi-Reel®

Engineering Selection Recommendations

ATMEGA128-16AU is suitable for applications where tray packaging is acceptable and active product status with ROHS3 compliance is required. This variant maintains full electrical and functional equivalence to the ATMEGA128-16AI while offering improved supply chain availability and regulatory compliance.

ATMEGA128-16AUR is the manufacturer-recommended substitute, offering the highest inventory availability and active product status. The Cut Tape and Digi-Reel® packaging format provides flexibility for both prototype and production-volume applications. ROHS3 compliance and verified programmability status support modern manufacturing and environmental standards.

Both substitute parts are pin-compatible and functionally identical to the ATMEGA128-16AI, requiring no design modifications for direct replacement in existing PCB layouts and firmware implementations.

Frequently Asked Questions (FAQ)

Q: Are ATMEGA128-16AU and ATMEGA128-16AUR pin-compatible with ATMEGA128-16AI?

A: Yes. All three parts share identical 64-TQFP (14x14) package geometry, pin count (53 I/O), and electrical specifications. Direct PCB substitution is possible without layout modifications.

Q: What is the primary difference between the substitute parts?

A: The ATMEGA128-16AU and ATMEGA128-16AUR differ only in packaging format (Tray versus Cut Tape & Digi-Reel®) and inventory availability. Both are Active products with ROHS3 compliance. The ATMEGA128-16AUR is the manufacturer-recommended option with significantly higher stock levels.

Q: Why is the ATMEGA128-16AI listed as Obsolete?

A: Obsolete status indicates the part is no longer in active production. The ATMEGA128-16AU and ATMEGA128-16AUR are active alternatives that provide continued access to the same microcontroller architecture and functionality.

Q: Does RoHS compliance affect functional compatibility?

A: No. RoHS compliance relates to material composition and environmental standards, not electrical performance or pin-level functionality. Both ROHS3-compliant substitutes operate identically to the non-compliant ATMEGA128-16AI.

Q: Can existing firmware be used with substitute parts without modification?

A: Yes. The substitute parts maintain identical core processor architecture, memory configuration, and peripheral set. Existing firmware requires no changes for operation on ATMEGA128-16AU or ATMEGA128-16AUR.

Q: What packaging format should be selected for production?

A: ATMEGA128-16AUR (Cut Tape & Digi-Reel®) is recommended for production environments due to manufacturer recommendation status and superior inventory availability. ATMEGA128-16AU (Tray) is suitable where tray-format handling is preferred.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message