AT90S8535-8AI Equivalent & Substitute Parts

Part Overview

The AT90S8535-8AI is an 8-bit AVR microcontroller manufactured by Microchip Technology, featuring 8KB FLASH program memory, 512 bytes EEPROM, and 32 I/O pins in a 44-TQFP surface mount package. This device is classified as obsolete and has been superseded by newer AVR microcontroller variants. Finding equivalent substitute parts is necessary due to the discontinued status of this component, which impacts long-term availability and supply chain reliability for new designs and production runs.

Key Parameters

Parameter	Value
Core Processor	AVR
Core Size	8-Bit
Speed	8MHz
Program Memory Size	8KB (4K x 16)
Program Memory Type	FLASH
EEPROM Size	512 x 8
RAM Size	512 x 8
Number of I/O	32
Voltage Supply (Vcc/Vdd)	4V ~ 6V
Data Converters	A/D 8x10b
Connectivity	SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT
Operating Temperature	-40°C ~ 85°C
Package / Case	44-TQFP (10x10)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the AT90S8535-8AI is determined by strict alignment of core electrical and mechanical parameters. The substitute part ATMEGA8535L-8AU maintains functional equivalence through identical specifications in the following critical areas: 8-bit AVR core processor architecture, 8MHz operating speed, 8KB FLASH program memory capacity, 512-byte EEPROM, 512-byte RAM, 32 I/O pins, 8x10-bit analog-to-digital converter, and identical 44-TQFP surface mount package dimensions (10x10mm).

The key substitution parameters are:

Core processor family (AVR)
Memory configuration (8KB FLASH, 512B EEPROM, 512B RAM)
I/O pin count (32)
Package type and dimensions (44-TQFP 10x10)
Operating temperature range (-40°C ~ 85°C)

Parameter Comparison

Parameter	AT90S8535-8AI	ATMEGA8535L-8AU
Manufacturer	Microchip Technology	Microchip Technology
Core Processor	AVR	AVR
Core Size	8-Bit	8-Bit
Speed	8MHz	8MHz
Program Memory Size	8KB (4K x 16)	8KB (4K x 16)
Program Memory Type	FLASH	FLASH
EEPROM Size	512 x 8	512 x 8
RAM Size	512 x 8	512 x 8
Number of I/O	32	32
Data Converters	A/D 8x10b	A/D 8x10b
Connectivity	SPI, UART/USART	I2C, SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT	Brown-out Detect/Reset, POR, PWM, WDT
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C (TA)
Voltage Supply (Vcc/Vdd)	4V ~ 6V	2.7V ~ 5.5V
Package / Case	44-TQFP (10x10)	44-TQFP (10x10)
Mounting Type	Surface Mount	Surface Mount
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The ATMEGA8535L-8AU is the direct substitute for the AT90S8535-8AI based on product lifecycle and compliance status. The original AT90S8535-8AI is obsolete, creating supply chain constraints for ongoing production and maintenance applications. The ATMEGA8535L-8AU is an active product with identical core functionality and pinout compatibility.

The substitute part offers improved compliance posture: ATMEGA8535L-8AU is ROHS3 compliant, whereas the original AT90S8535-8AI is RoHS non-compliant. Both parts maintain REACH Unaffected status and EAR99 export classification.

The ATMEGA8535L-8AU provides an expanded voltage supply range (2.7V ~ 5.5V) compared to the original part (4V ~ 6V), offering greater design flexibility for low-power applications. The substitute adds I2C connectivity in addition to the original SPI and UART/USART interfaces, providing enhanced communication protocol support without compromising existing functionality.

Frequently Asked Questions (FAQ)

Q: Are AT90S8535-8AI and ATMEGA8535L-8AU pin-compatible? A: Yes. Both devices use the 44-TQFP (10x10mm) package with identical pin assignments, enabling direct socket replacement without PCB redesign.

Q: What is the primary reason for substitution? A: The AT90S8535-8AI is classified as obsolete. The ATMEGA8535L-8AU is an active product from the same manufacturer, ensuring long-term availability and supply chain continuity.

Q: Are there memory differences between these parts? A: No. Both parts feature identical memory configurations: 8KB FLASH program memory, 512 bytes EEPROM, and 512 bytes RAM.

Q: Does the substitute part support the same operating temperature range? A: Yes. Both parts operate across -40°C to 85°C, maintaining thermal compatibility for industrial and extended-temperature applications.

Q: What is the voltage supply difference? A: The AT90S8535-8AI operates at 4V ~ 6V, while the ATMEGA8535L-8AU operates at 2.7V ~ 5.5V. The substitute supports a wider voltage range, enabling operation at lower supply voltages.

Q: Does the substitute part add new connectivity options? A: Yes. The ATMEGA8535L-8AU includes I2C connectivity in addition to SPI and UART/USART. Existing designs using only SPI and UART/USART remain fully compatible.

Q: Is the substitute part RoHS compliant? A: Yes. The ATMEGA8535L-8AU is ROHS3 compliant, whereas the original AT90S8535-8AI is RoHS non-compliant. This improves compliance for new designs and regulated markets.

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