ATMEGA161-8AI Equivalent & Substitute Parts

Part Overview

The ATMEGA161-8AI is an 8-bit AVR microcontroller manufactured by Microchip Technology, featuring 16KB FLASH program memory, 1KB RAM, and 512 bytes EEPROM. This device operates at 8MHz with a 44-TQFP surface mount package and supports SPI and UART/USART connectivity. The ATMEGA161-8AI is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Core Processor	AVR
Core Size	8-Bit
Speed	8MHz
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	35
Voltage Supply Range	4V ~ 5.5V
Package Type	44-TQFP (10x10)
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 85°C

Substitute Part Grouping Explanation

Substitution of the ATMEGA161-8AI is determined by strict equivalence across the following critical parameters:

Core Architecture: AVR processor family
Memory Configuration: 16KB FLASH, 1KB RAM, 512 bytes EEPROM
I/O Count: 35 I/O pins
Package: 44-TQFP (10x10) surface mount
Operating Temperature Range: -40°C ~ 85°C
Connectivity Interfaces: SPI and UART/USART support

The ATMEGA162V-8AU qualifies as a direct substitute based on matching core architecture, memory capacity, I/O pin count, package form factor, and operating temperature specifications. Both devices maintain identical program memory, RAM, and EEPROM configurations, ensuring software and hardware compatibility at the functional level.

Parameter Comparison

Parameter	ATMEGA161-8AI	ATMEGA162V-8AU
Manufacturer	Microchip Technology	Microchip Technology
Core Processor	AVR	AVR
Core Size	8-Bit	8-Bit
Speed	8MHz	8MHz
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	35	35
Voltage Supply Range	4V ~ 5.5V	1.8V ~ 5.5V
Oscillator Type	External	Internal
Connectivity	SPI, UART/USART	EBI/EMI, SPI, UART/USART
Peripherals	POR, PWM, WDT	Brown-out Detect/Reset, POR, PWM, WDT
Package / Case	44-TQFP (10x10)	44-TQFP (10x10)
Mounting Type	Surface Mount	Surface Mount
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The ATMEGA162V-8AU is the qualified substitute for the obsolete ATMEGA161-8AI. Selection of the ATMEGA162V-8AU provides the following advantages:

Product Availability: Active product status ensures continued supply and manufacturing support
Regulatory Compliance: ROHS3 compliant, meeting current environmental and material restrictions
Enhanced Functionality: Includes brown-out detection/reset and internal oscillator options, providing additional design flexibility
Extended Supply Voltage Range: 1.8V ~ 5.5V operation accommodates broader power supply specifications compared to the 4V ~ 5.5V requirement of the original part
Identical Core Specifications: Maintains 8-bit AVR architecture, 16KB FLASH memory, 1KB RAM, 512 bytes EEPROM, 35 I/O pins, and 44-TQFP package compatibility

Frequently Asked Questions (FAQ)

Q: Are the ATMEGA161-8AI and ATMEGA162V-8AU pin-compatible?

A: Yes. Both devices use the 44-TQFP (10x10) package with identical pin counts and I/O configuration (35 I/O pins). Pin-to-pin compatibility is maintained for direct board-level substitution.

Q: What is the primary difference between these two microcontrollers?

A: The ATMEGA162V-8AU offers enhanced features including internal oscillator capability, brown-out detection/reset, and extended supply voltage range (1.8V ~ 5.5V versus 4V ~ 5.5V). Both devices share identical memory capacity and core processing specifications.

Q: Can firmware developed for the ATMEGA161-8AI run on the ATMEGA162V-8AU?

A: Firmware compatibility is maintained due to identical core architecture, memory configuration, and I/O specifications. The ATMEGA162V-8AU supports all instruction sets and peripheral functions required by ATMEGA161-8AI applications.

Q: Why is the ATMEGA161-8AI classified as obsolete?

A: The ATMEGA161-8AI has reached end-of-life status in Microchip's product portfolio. The ATMEGA162V-8AU represents the active successor offering equivalent functionality with enhanced features and regulatory compliance.

Q: What packaging options are available for the ATMEGA162V-8AU?

A: The ATMEGA162V-8AU is supplied in Tray packaging, maintaining the 44-TQFP (10x10) surface mount form factor identical to the original ATMEGA161-8AI.

Q: Are there supply voltage considerations when substituting these parts?

A: The ATMEGA162V-8AU supports a wider supply voltage range (1.8V ~ 5.5V) compared to the ATMEGA161-8AI (4V ~ 5.5V). Existing designs operating within the 4V ~ 5.5V window require no modification. Designs utilizing lower supply voltages may benefit from the extended range capability of the substitute part.

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