ATMEGA168-20AI Equivalent & Substitute Parts

Part Overview

The ATMEGA168-20AI is an 8-bit AVR microcontroller manufactured by Microchip Technology, featuring 16KB FLASH memory, 1KB RAM, and 512 bytes EEPROM. Operating at 20MHz with a supply voltage range of 2.7V to 5.5V, this device integrates 23 I/O pins and comprehensive peripheral support including I2C, SPI, UART/USART, PWM, and watchdog timer functionality in a 32-TQFP surface mount package.

The ATMEGA168-20AI is classified as obsolete. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production requirements for applications utilizing this microcontroller architecture.

Substiute Parts

ATMEGA168-20AI

Microchip TechnologyIn Stock: 881ATMEGA168-20AI Datasheet

Current PartRFQ

ATMEGA168-20AU

Microchip TechnologyIn Stock: 22745ATMEGA168-20AU Datasheet

DirectRFQ

ATMEGA168P-20AU

Microchip TechnologyIn Stock: 1931ATMEGA168P-20AU Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ATMEGA168-20AI is determined by strict equivalence across the following critical parameters:

Core Architecture & Performance: AVR core processor, 8-bit configuration, 20MHz operating frequency Memory Configuration: 16KB FLASH program memory, 1KB RAM, 512 bytes EEPROM Electrical Specifications: 2.7V to 5.5V supply voltage range, -40°C to 85°C operating temperature Functional Integration: 23 I/O pins, I2C/SPI/UART connectivity, integrated PWM, watchdog timer, brown-out detection Physical Form Factor: 32-TQFP (7x7) surface mount package, MSL 3 rating

Substitute parts must maintain identical electrical and functional characteristics across all parameters listed above. Packaging format (tray vs. other configurations) and product status (active vs. obsolete) do not affect functional substitutability but influence availability and compliance posture.

Parameter Comparison

Engineering Selection Recommendations

ATMEGA168-20AU is the direct functional equivalent of the ATMEGA168-20AI. Both devices share identical electrical specifications, memory configuration, and peripheral integration. The ATMEGA168-20AU maintains active product status with ROHS3 compliance, providing superior supply chain availability compared to the obsolete ATMEGA168-20AI. This part is verified as programmable through DiGi-Electronics channels.

ATMEGA168P-20AU is a parametric equivalent offering identical core functionality, memory, and electrical characteristics. The ATMEGA168P variant represents an enhanced version within the ATmega series, maintaining full compatibility with ATMEGA168-20AI designs. This part is also ROHS3 compliant and maintains active product status. Programmability verification status differs from ATMEGA168-20AU.

Both substitute parts are suitable for direct replacement in applications currently utilizing the ATMEGA168-20AI, provided that design validation confirms compatibility with the specific application requirements.

Frequently Asked Questions (FAQ)

Q: Can ATMEGA168-20AU directly replace ATMEGA168-20AI in existing designs?

A: Yes. The ATMEGA168-20AU is functionally identical to the ATMEGA168-20AI across all electrical, memory, and peripheral specifications. Both devices operate at 20MHz, feature 16KB FLASH memory, 1KB RAM, and 512 bytes EEPROM in a 32-TQFP package. The primary difference is product status: ATMEGA168-20AU is active with ROHS3 compliance, while ATMEGA168-20AI is obsolete and RoHS non-compliant.

Q: What is the difference between ATMEGA168-20AU and ATMEGA168P-20AU?

A: Both parts are parametrically equivalent with identical core processor architecture, clock speed, memory configuration, and I/O count. The ATMEGA168P designation indicates an enhanced variant within the ATmega series. Both maintain the same 32-TQFP package, voltage range (2.7V to 5.5V), and operating temperature (-40°C to 85°C). Both are ROHS3 compliant and active products.

Q: Are there packaging differences between these substitute parts?

A: The ATMEGA168-20AI is supplied in standard packaging, while ATMEGA168-20AU and ATMEGA168P-20AU are supplied in tray packaging. Both substitute parts maintain the identical 32-TQFP (7x7) physical form factor and MSL 3 moisture sensitivity rating. Packaging format does not affect functional compatibility or electrical performance.

Q: What compliance considerations apply to substitution?

A: The ATMEGA168-20AI is RoHS non-compliant. Both substitute parts (ATMEGA168-20AU and ATMEGA168P-20AU) are ROHS3 compliant. If your application or supply chain requires RoHS compliance, substitution with either ATMEGA168-20AU or ATMEGA168P-20AU is necessary. Both parts maintain REACH unaffected status and EAR99 ECCN classification.

Q: How do I verify programmability compatibility?

A: ATMEGA168-20AU is verified as programmable through DiGi-Electronics. ATMEGA168P-20AU programmability verification status is not verified through DiGi-Electronics channels. Consult device datasheets and programming tool documentation to confirm compatibility with your specific development environment.

Q: What inventory considerations should I evaluate?

A: ATMEGA168-20AU maintains significantly higher inventory (22,734 pcs) compared to ATMEGA168P-20AU (1,900 pcs) and the obsolete ATMEGA168-20AI (777 pcs). For production continuity and supply chain reliability, ATMEGA168-20AU is the preferred substitute option.