ATMEGA8535-16AI Equivalent & Substitute Parts

Part Overview

The ATMEGA8535-16AI is an 8-bit AVR microcontroller manufactured by Microchip Technology, featuring 8KB of FLASH program memory, 512 bytes of EEPROM, and 512 bytes of RAM. This device operates at 16MHz with a 44-TQFP surface mount package and supports multiple communication interfaces including I2C, SPI, and UART/USART.

The ATMEGA8535-16AI carries an obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure component availability, and support ongoing production requirements for applications utilizing this microcontroller architecture.

Key Parameters

Parameter	Value
Core Processor	AVR
Core Size	8-Bit
Speed	16MHz
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)	4.5V ~ 5.5V
Data Converters	A/D 8x10b
Connectivity	I2C, SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	44-TQFP (10x10)
Oscillator Type	Internal

Substitute Part Grouping Explanation

Substitution of the ATMEGA8535-16AI is determined by strict equivalence across all electrical and mechanical parameters. The substitute part must maintain identical specifications for core processor architecture, memory configuration, I/O count, voltage supply range, operating temperature range, package type, and pin count.

The ATMEGA8535-16AU qualifies as a direct substitute based on the following matching parameters:

Core Processor: AVR (identical)
Core Size: 8-Bit (identical)
Speed: 16MHz (identical)
Program Memory: 8KB FLASH (identical)
EEPROM: 512 x 8 (identical)
RAM: 512 x 8 (identical)
I/O Count: 32 (identical)
Voltage Supply: 4.5V ~ 5.5V (identical)
Data Converters: A/D 8x10b (identical)
Connectivity: I2C, SPI, UART/USART (identical)
Peripherals: Brown-out Detect/Reset, POR, PWM, WDT (identical)
Operating Temperature: -40°C ~ 85°C (identical)
Package: 44-TQFP (10x10) (identical)
Oscillator Type: Internal (identical)

Parameter Comparison

Parameter	ATMEGA8535-16AI	ATMEGA8535-16AU
Manufacturer	Microchip Technology	Microchip Technology
Core Processor	AVR	AVR
Core Size	8-Bit	8-Bit
Speed	16MHz	16MHz
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
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
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount	Surface Mount
Package / Case	44-TQFP (10x10)	44-TQFP (10x10)
Oscillator Type	Internal	Internal
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

The ATMEGA8535-16AU is the direct functional equivalent of the ATMEGA8535-16AI. Both devices share identical electrical specifications, memory architecture, I/O configuration, and package dimensions.

The primary distinction between these parts is product lifecycle status and regulatory compliance. The ATMEGA8535-16AI is classified as obsolete, while the ATMEGA8535-16AU maintains active product status from Microchip Technology. The ATMEGA8535-16AU additionally carries ROHS3 compliance certification, whereas the ATMEGA8535-16AI is RoHS non-compliant.

For new designs or production continuity, the ATMEGA8535-16AU is the appropriate selection. Both devices are functionally interchangeable at the circuit level, with identical pin assignments, electrical characteristics, and operational parameters. The 44-TQFP package geometry and pinout are identical, permitting direct board-level substitution without design modification.

Frequently Asked Questions (FAQ)

Q: Can the ATMEGA8535-16AU be used as a direct replacement for the ATMEGA8535-16AI in existing designs?

A: Yes. The ATMEGA8535-16AU is electrically and mechanically identical to the ATMEGA8535-16AI. All electrical parameters, memory specifications, I/O configuration, and package dimensions are equivalent. Direct substitution is possible without circuit modification.

Q: What is the difference between the ATMEGA8535-16AI and ATMEGA8535-16AU?

A: The devices are functionally identical. The primary differences are product status and compliance certification. The ATMEGA8535-16AI is obsolete and RoHS non-compliant. The ATMEGA8535-16AU is an active product with ROHS3 compliance.

Q: Are the pin assignments identical between these two parts?

A: Yes. Both the ATMEGA8535-16AI and ATMEGA8535-16AU use the 44-TQFP (10x10) package with identical pinout. No PCB redesign is required for substitution.

Q: What is the operating voltage range for both devices?

A: Both devices operate within a supply voltage range of 4.5V to 5.5V (Vcc/Vdd).

Q: Do both parts support the same communication protocols?

A: Yes. Both the ATMEGA8535-16AI and ATMEGA8535-16AU support I2C, SPI, and UART/USART connectivity interfaces.

Q: What is the memory configuration for these microcontrollers?

A: Both devices feature 8KB of FLASH program memory (4K x 16), 512 bytes of EEPROM, and 512 bytes of RAM.

Q: Are there any differences in the number of I/O pins?

A: No. Both devices provide 32 I/O pins in the 44-TQFP package.

Q: What is the operating temperature range?

A: Both devices operate across a temperature range of -40°C to 85°C (TA).

Q: Does the ATMEGA8535-16AU have the same internal oscillator as the ATMEGA8535-16AI?

A: Yes. Both devices feature an internal oscillator type and operate at 16MHz.

Q: What are the moisture sensitivity requirements for handling these components?

A: Both devices carry a Moisture Sensitivity Level (MSL) rating of 3, with a 168-hour exposure limit.

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