ATMEGA16-16AC Equivalent & Substitute Parts

Part Overview

The ATMEGA16-16AC is an 8-bit AVR microcontroller manufactured by Microchip Technology, featuring 16KB of FLASH program memory, 1KB of RAM, and 512 bytes of EEPROM. This device integrates 32 I/O pins, multiple communication interfaces (I2C, SPI, UART/USART), and operates at 16MHz with an internal oscillator. The ATMEGA16-16AC is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Core Processor	AVR
Core Size	8-Bit
Speed	16MHz
Program Memory Size	16KB (8K x 16)
Program Memory Type	FLASH
EEPROM Size	512 x 8
RAM Size	1K x 8
Number of I/O	32
Voltage Supply (Vcc/Vdd)	4.5V ~ 5.5V
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

Substitute Part Grouping Explanation

Substitution of the ATMEGA16-16AC is determined by strict equivalence across the following critical parameters:

Core Architecture: AVR processor family
Memory Configuration: 16KB FLASH, 1KB RAM, 512 bytes EEPROM
Operating Frequency: 16MHz
I/O Count: 32 pins
Supply Voltage Range: 4.5V ~ 5.5V
Package Format: 44-TQFP (10x10) surface mount
Peripheral Set: I2C, SPI, UART/USART, PWM, WDT, Brown-out Detect/Reset, POR
Data Conversion: 8-channel 10-bit A/D converter

The ATMEGA16-16AU meets all these criteria and qualifies as a direct functional equivalent. Substitution is valid when all parameters listed above remain unchanged between the main part and substitute.

Parameter Comparison

Parameter	ATMEGA16-16AC	ATMEGA16-16AU	Match
Manufacturer	Microchip Technology	Microchip Technology	✓
Core Processor	AVR	AVR	✓
Core Size	8-Bit	8-Bit	✓
Speed	16MHz	16MHz	✓
Program Memory Size	16KB (8K x 16)	16KB (8K x 16)	✓
Program Memory Type	FLASH	FLASH	✓
EEPROM Size	512 x 8	512 x 8	✓
RAM Size	1K x 8	1K x 8	✓
Number of I/O	32	32	✓
Voltage Supply (Vcc/Vdd)	4.5V ~ 5.5V	4.5V ~ 5.5V	✓
Data Converters	A/D 8x10b	A/D 8x10b	✓
Connectivity	I2C, SPI, UART/USART	I2C, SPI, UART/USART	✓
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT	Brown-out Detect/Reset, POR, PWM, WDT	✓
Package / Case	44-TQFP (10x10)	44-TQFP (10x10)	✓
Mounting Type	Surface Mount	Surface Mount	✓
Product Status	Obsolete	Active	—
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C	Extended Range
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Improved

Engineering Selection Recommendations

The ATMEGA16-16AU is the direct functional substitute for the ATMEGA16-16AC. Both devices share identical core architecture, memory configuration, I/O count, and peripheral set. Selection between these parts should be based on the following factors:

Product Status: The ATMEGA16-16AC is obsolete, while the ATMEGA16-16AU maintains active production status. For new designs or long-term production requirements, the ATMEGA16-16AU is the appropriate choice.

Compliance: The ATMEGA16-16AU is ROHS3 compliant, whereas the ATMEGA16-16AC is non-compliant. Applications subject to RoHS regulations require the ATMEGA16-16AU.

Operating Temperature Range: The ATMEGA16-16AU supports an extended operating temperature range of -40°C to 85°C compared to the ATMEGA16-16AC range of 0°C to 70°C. Applications requiring operation outside the 0°C to 70°C window necessitate the ATMEGA16-16AU.

Packaging: Both devices are supplied in 44-TQFP (10x10) surface mount packages. The ATMEGA16-16AU is supplied in Tray packaging, while the ATMEGA16-16AC packaging format is unspecified.

Frequently Asked Questions (FAQ)

Q: Can ATMEGA16-16AU be used as a direct replacement for ATMEGA16-16AC in existing designs?

A: Yes. The ATMEGA16-16AU is functionally equivalent across all critical parameters: core architecture, memory size, I/O count, operating frequency, supply voltage, and peripheral set. Pin-for-pin compatibility and identical instruction set ensure direct substitution without design modification.

Q: What are the key differences between ATMEGA16-16AC and ATMEGA16-16AU?

A: The primary differences are product status (obsolete vs. active), operating temperature range (0°C–70°C vs. -40°C–85°C), and RoHS compliance status (non-compliant vs. ROHS3 compliant). All functional and electrical parameters remain identical.

Q: Are there any package or pinout differences?

A: No. Both devices use the 44-TQFP (10x10) surface mount package with identical pinout and electrical characteristics.

Q: Why should I choose ATMEGA16-16AU over ATMEGA16-16AC?

A: The ATMEGA16-16AU is recommended for new designs and production continuity because it maintains active product status, meets RoHS3 compliance requirements, and supports an extended operating temperature range. The ATMEGA16-16AC is obsolete and should not be selected for new applications.

Q: Is the extended temperature range of ATMEGA16-16AU a requirement for my application?

A: The extended range (-40°C to 85°C) is necessary only if your application operates outside the 0°C to 70°C window. For applications within the standard range, both devices perform identically.

Q: What is the impact of RoHS compliance on component selection?

A: RoHS3 compliance is mandatory for products sold in regulated markets. The ATMEGA16-16AU meets this requirement, while the ATMEGA16-16AC does not. Regulatory requirements determine whether RoHS compliance is necessary for your application.

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