AT90S4414-8AI Equivalent & Substitute Parts

Part Overview

The AT90S4414-8AI is an 8-bit AVR microcontroller from Microchip Technology's AVR 90S series, featuring 4KB of FLASH program memory and operating at 8MHz. This device is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. The part is available in a 44-TQFP surface mount package with RoHS non-compliant status.

Key Parameters

Parameter	Value
Manufacturer Part Number	AT90S4414-8AI
Manufacturer	Microchip Technology
Core Processor	AVR
Core Size	8-Bit
Speed	8MHz
Program Memory Size	4KB (2K x 16)
Program Memory Type	FLASH
EEPROM Size	256 x 8
RAM Size	256 x 8
Voltage - Supply (Vcc/Vdd)	4V ~ 6V
Number of I/O	32
Connectivity	SPI, UART/USART
Peripherals	PWM, WDT
Package / Case	44-TQFP (10x10)
Operating Temperature	-40°C ~ 85°C
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution for the AT90S4414-8AI is determined by the following critical parameters: AVR core processor architecture, 8-bit core size, 44-TQFP package compatibility, and operating temperature range of -40°C to 85°C. Both substitute parts maintain these core requirements while offering enhanced memory capacity and improved product status.

The ATMEGA8515L-8AU and ATMEGA8535-16AU are qualified substitutes based on:

Identical AVR core processor and 8-bit architecture
Same 44-TQFP (10x10) surface mount package
Matching operating temperature range (-40°C ~ 85°C)
Increased program memory (8KB vs 4KB) and EEPROM/RAM capacity
Active product status with RoHS3 compliance

Parameter Comparison

Parameter	AT90S4414-8AI	ATMEGA8515L-8AU	ATMEGA8535-16AU
Manufacturer	Microchip Technology	Microchip Technology	Microchip Technology
Core Processor	AVR	AVR	AVR
Core Size	8-Bit	8-Bit	8-Bit
Speed	8MHz	8MHz	16MHz
Program Memory Size	4KB (2K x 16)	8KB (4K x 16)	8KB (4K x 16)
Program Memory Type	FLASH	FLASH	FLASH
EEPROM Size	256 x 8	512 x 8	512 x 8
RAM Size	256 x 8	512 x 8	512 x 8
Voltage - Supply (Vcc/Vdd)	4V ~ 6V	2.7V ~ 5.5V	4.5V ~ 5.5V
Number of I/O	32	35	32
Connectivity	SPI, UART/USART	EBI/EMI, SPI, UART/USART	I2C, SPI, UART/USART
Peripherals	PWM, WDT	Brown-out Detect/Reset, POR, PWM, WDT	Brown-out Detect/Reset, POR, PWM, WDT, A/D 8x10b
Package / Case	44-TQFP (10x10)	44-TQFP (10x10)	44-TQFP (10x10)
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

Both substitute parts are active products with ROHS3 compliance, addressing the obsolete status and non-compliance of the AT90S4414-8AI. The ATMEGA8515L-8AU maintains the 8MHz operating speed of the original part while providing doubled memory capacity and extended voltage supply range (2.7V ~ 5.5V). The ATMEGA8535-16AU offers higher clock speed at 16MHz with integrated analog-to-digital conversion capability and I2C connectivity, suitable for applications requiring enhanced processing performance and sensor integration.

Selection between the two substitutes depends on application requirements: choose ATMEGA8515L-8AU for speed-matched replacement with improved memory and lower voltage operation; choose ATMEGA8535-16AU for applications benefiting from higher clock speed and analog conversion features.

Frequently Asked Questions (FAQ)

Q: Can ATMEGA8515L-8AU directly replace AT90S4414-8AI in existing designs?

A: Yes, the ATMEGA8515L-8AU is pin-compatible in the 44-TQFP package and maintains the same operating temperature range. The 8MHz speed matches the original part. Increased memory capacity is backward-compatible with designs utilizing less than 4KB program memory.

Q: What is the voltage supply difference between substitutes?

A: The AT90S4414-8AI operates at 4V ~ 6V. The ATMEGA8515L-8AU extends the lower limit to 2.7V, enabling operation in lower-voltage applications. The ATMEGA8535-16AU maintains 4.5V ~ 5.5V operation, requiring verification against original supply specifications.

Q: Are there connectivity differences between the parts?

A: The AT90S4414-8AI provides SPI and UART/USART connectivity. The ATMEGA8515L-8AU adds EBI/EMI support. The ATMEGA8535-16AU adds I2C connectivity and includes an 8-channel 10-bit analog-to-digital converter. Designs not utilizing these additional interfaces are unaffected.

Q: What is the impact of the 16MHz speed in ATMEGA8535-16AU?

A: The ATMEGA8535-16AU operates at double the clock speed of the original part. Applications sensitive to timing must account for this difference. Designs not dependent on specific clock frequency can operate at the higher speed without modification.

Q: Are moisture sensitivity levels identical?

A: Yes, all three parts share MSL 3 (168 Hours) rating, requiring identical handling and storage conditions.

Q: What is the significance of RoHS3 compliance in substitutes?

A: Both substitute parts meet ROHS3 compliance standards, addressing regulatory requirements that the obsolete AT90S4414-8AI does not satisfy. This is critical for new designs and production continuity in regulated markets.

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