ATMEGA128-16AC Equivalent & Substitute Parts

Part Overview

The ATMEGA128-16AC is an 8-bit AVR microcontroller from Microchip Technology featuring 128KB of FLASH program memory, 4KB EEPROM, and 4KB RAM. This device operates at 16MHz with a 64-pin TQFP package and supports multiple communication interfaces including SPI, I2C, and UART/USART. The ATMEGA128-16AC is classified as obsolete, making identification of active equivalent parts essential for new designs and ongoing production requirements.

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
Voltage Supply (Vcc/Vdd)	4.5V ~ 5.5V
Number of I/O	53
Data Converters	A/D 8x10b
Connectivity	EBI/EMI, I2C, SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT
Package / Case	64-TQFP (14x14)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution of the ATMEGA128-16AC is determined by strict equivalence across the following critical parameters:

Core Architecture: AVR processor family
Memory Configuration: 128KB FLASH, 4KB EEPROM, 4KB RAM
Clock Speed: 16MHz operation
Package Format: 64-pin TQFP (14x14mm)
Pin Count and I/O: 53 I/O lines
Voltage Range: 4.5V to 5.5V supply compatibility
Interface Protocols: EBI/EMI, I2C, SPI, UART/USART support
Peripheral Set: Brown-out Detect/Reset, POR, PWM, WDT

The ATMEGA128-16AU meets all these criteria and serves as a direct functional equivalent. The primary distinction lies in product status and compliance certifications rather than electrical or mechanical specifications.

Parameter Comparison

Parameter	ATMEGA128-16AC	ATMEGA128-16AU
Manufacturer	Microchip Technology	Microchip Technology
Core Processor	AVR	AVR
Core Size	8-Bit	8-Bit
Speed	16MHz	16MHz
Program Memory Size	128KB (64K x 16)	128KB (64K x 16)
Program Memory Type	FLASH	FLASH
EEPROM Size	4K x 8	4K x 8
RAM Size	4K x 8	4K x 8
Voltage Supply (Vcc/Vdd)	4.5V ~ 5.5V	4.5V ~ 5.5V
Number of I/O	53	53
Data Converters	A/D 8x10b	A/D 8x10b
Connectivity	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
Package / Case	64-TQFP (14x14)	64-TQFP (14x14)
Mounting Type	Surface Mount	Surface Mount
Operating Temperature	0°C ~ 70°C (TA)	-40°C ~ 85°C (TA)
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

The ATMEGA128-16AU is the active equivalent for the obsolete ATMEGA128-16AC. Both devices share identical electrical specifications, memory configurations, and pin assignments within the 64-TQFP package format.

Product Status Consideration: The ATMEGA128-16AC is classified as obsolete, while the ATMEGA128-16AU maintains active production status. For new designs and ongoing production, the ATMEGA128-16AU is the appropriate selection.

Compliance Difference: The ATMEGA128-16AU is ROHS3 compliant, whereas the ATMEGA128-16AC is RoHS non-compliant. This distinction is significant for applications subject to RoHS regulations and environmental compliance requirements.

Operating Temperature Range: The ATMEGA128-16AU supports an extended operating temperature range of -40°C to 85°C compared to the ATMEGA128-16AC range of 0°C to 70°C. Applications requiring operation outside the 0°C to 70°C window must use the ATMEGA128-16AU.

Pin and Package Compatibility: Both parts utilize identical 64-pin TQFP (14x14mm) packaging with 53 I/O lines, ensuring direct PCB layout compatibility and no redesign requirements for package migration.

Frequently Asked Questions (FAQ)

Q: Can ATMEGA128-16AU replace ATMEGA128-16AC in existing designs?

A: Yes. The ATMEGA128-16AU is electrically and mechanically equivalent to the ATMEGA128-16AC. Both devices feature identical core architecture, memory configuration, clock speed, pin count, and peripheral set. No PCB redesign is required for package substitution.

Q: What is the primary reason to substitute ATMEGA128-16AC with ATMEGA128-16AU?

A: The ATMEGA128-16AC is obsolete and no longer in production. The ATMEGA128-16AU is the active equivalent part maintained in current production by Microchip Technology.

Q: Are there operating temperature differences between these parts?

A: Yes. The ATMEGA128-16AC operates from 0°C to 70°C, while the ATMEGA128-16AU operates from -40°C to 85°C. Applications requiring extended temperature operation must use the ATMEGA128-16AU.

Q: Does the ATMEGA128-16AU meet RoHS compliance requirements?

A: Yes. The ATMEGA128-16AU is ROHS3 compliant. The ATMEGA128-16AC is RoHS non-compliant. For applications subject to RoHS regulations, the ATMEGA128-16AU is required.

Q: Are the pin assignments identical between ATMEGA128-16AC and ATMEGA128-16AU?

A: Yes. Both parts use the same 64-pin TQFP (14x14mm) package with identical pin assignments and 53 I/O lines. Direct socket compatibility is maintained.

Q: What is the moisture sensitivity level for both parts?

A: Both the ATMEGA128-16AC and ATMEGA128-16AU have a Moisture Sensitivity Level (MSL) of 3, corresponding to a 168-hour floor life requirement.

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