ATMEGA8535L-8AC Equivalent & Substitute Parts

Part Overview

The ATMEGA8535L-8AC is an 8-bit AVR microcontroller manufactured by Microchip Technology, featuring 8KB FLASH program memory, 512 bytes EEPROM, and 512 bytes RAM. This device integrates 32 I/O pins, internal oscillator, and communication interfaces including I2C, SPI, and UART/USART. The ATMEGA8535L-8AC is classified as obsolete, which necessitates identification of functionally equivalent alternatives for new designs and production continuity.

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)	2.7V ~ 5.5V
Data Converters	A/D 8x10b
Connectivity	I2C, SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT
Package / Case	44-TQFP (10x10)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution of the ATMEGA8535L-8AC is determined by strict equivalence across the following critical parameters:

Core processor architecture (AVR)
Core size (8-Bit)
Operating frequency (8MHz)
Program memory capacity and type (8KB FLASH)
EEPROM and RAM sizes (512 x 8 each)
I/O pin count (32)
Supply voltage range (2.7V ~ 5.5V)
Peripheral feature set (I2C, SPI, UART/USART, Brown-out Detect/Reset, POR, PWM, WDT)
Package type (44-TQFP)

The ATMEGA8535L-8AU meets all these criteria and is therefore a direct functional equivalent. Differences exist only in product status, operating temperature range, RoHS compliance, and packaging format (Tray vs. unspecified).

Parameter Comparison

Parameter	ATMEGA8535L-8AC	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
Voltage Supply (Vcc/Vdd)	2.7V ~ 5.5V	2.7V ~ 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
Package / Case	44-TQFP (10x10)	44-TQFP (10x10)
Mounting Type	Surface Mount	Surface Mount
Operating Temperature	0°C ~ 70°C (TA)	-40°C ~ 85°C (TA)
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 ATMEGA8535L-8AU is the direct substitute for the ATMEGA8535L-8AC based on functional equivalence across all core electrical and mechanical parameters. Selection of the ATMEGA8535L-8AU is supported by the following factors:

Active product status ensures ongoing availability and manufacturing support
ROHS3 compliance satisfies current regulatory requirements for electronic components
Extended operating temperature range (-40°C ~ 85°C) provides broader environmental applicability compared to the original part (0°C ~ 70°C)
Identical core architecture, memory configuration, I/O count, and peripheral feature set ensure pin-for-pin and functional compatibility
44-TQFP package maintains mechanical compatibility with existing PCB designs

For applications requiring the original operating temperature range (0°C ~ 70°C), the ATMEGA8535L-8AU remains suitable as it exceeds the specified range. Applications requiring RoHS non-compliance must evaluate alternative sourcing strategies, as the substitute part is ROHS3 compliant.

Frequently Asked Questions (FAQ)

Q: Is the ATMEGA8535L-8AU a direct pin-for-pin replacement for the ATMEGA8535L-8AC?

A: Yes. Both devices use the 44-TQFP (10x10) package with identical pin assignments. The I/O pin count (32), connectivity interfaces (I2C, SPI, UART/USART), and peripheral configuration are identical.

Q: What are the differences between these two parts?

A: The primary differences are product status (Obsolete vs. Active), operating temperature range (0°C ~ 70°C vs. -40°C ~ 85°C), and RoHS compliance status (non-compliant vs. ROHS3 compliant). All functional and electrical parameters are equivalent.

Q: Can the ATMEGA8535L-8AU be used in applications designed for the ATMEGA8535L-8AC?

A: Yes. The extended operating temperature range and improved compliance status of the ATMEGA8535L-8AU make it suitable for all applications originally specified for the ATMEGA8535L-8AC.

Q: Are there any firmware or software modifications required when switching to the ATMEGA8535L-8AU?

A: No. The identical core processor architecture, memory configuration, and peripheral feature set ensure full software compatibility without modification.

Q: What is the significance of the different packaging formats (Tray vs. unspecified)?

A: Packaging format affects component handling, storage, and assembly processes but does not impact electrical or functional performance. The Tray format of the ATMEGA8535L-8AU is standard for active production parts and is compatible with automated assembly equipment.

Q: Is the ATMEGA8535L-8AU available in higher volumes than the ATMEGA8535L-8AC?

A: Yes. The ATMEGA8535L-8AU is an active product with 7707 units in stock, compared to the obsolete ATMEGA8535L-8AC with 2360 units. Active status ensures continued availability for production requirements.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message