ATMEGA8535-16AC Equivalent & Substitute Parts

Part Overview

The ATMEGA8535-16AC is an 8-bit AVR microcontroller manufactured by Microchip Technology, featuring 8KB FLASH program memory, 512 bytes EEPROM, and 512 bytes RAM. This device operates at 16MHz with integrated peripherals including I2C, SPI, UART/USART connectivity, brown-out detection, PWM, and watchdog timer functionality in a 44-TQFP surface mount package.

The ATMEGA8535-16AC carries an Obsolete product status. Locating equivalent substitute parts is necessary for ongoing production support, design revisions, and inventory replenishment where original stock availability is limited or discontinued.

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
Connectivity	I2C, SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT
Data Converters	A/D 8x10b
Voltage Supply (Vcc/Vdd)	4.5V ~ 5.5V
Oscillator Type	Internal
Package / Case	44-TQFP (10x10)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution of the ATMEGA8535-16AC is determined by strict equivalence across the following critical parameters:

Core Architecture: AVR processor family
Memory Configuration: 8KB FLASH, 512 bytes EEPROM, 512 bytes RAM
Operating Frequency: 16MHz
Peripheral Set: I2C, SPI, UART/USART, brown-out detection, PWM, watchdog timer
I/O Count: 32 pins
Package: 44-TQFP (10x10) surface mount
Voltage Range: 4.5V ~ 5.5V supply

The ATMEGA8535-16AU qualifies as a direct substitute based on identical electrical specifications, memory configuration, peripheral functionality, and package format. Differences in product status, operating temperature range, and compliance certifications do not affect functional interchangeability in applications designed for the ATMEGA8535-16AC.

Parameter Comparison

Parameter	ATMEGA8535-16AC	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
Connectivity	I2C, SPI, UART/USART	I2C, SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT	Brown-out Detect/Reset, POR, PWM, WDT
Data Converters	A/D 8x10b	A/D 8x10b
Voltage Supply (Vcc/Vdd)	4.5V ~ 5.5V	4.5V ~ 5.5V
Oscillator Type	Internal	Internal
Package / Case	44-TQFP (10x10)	44-TQFP (10x10)
Mounting Type	Surface Mount	Surface Mount
Product Status	Obsolete	Active
Operating Temperature	0°C ~ 70°C (TA)	-40°C ~ 85°C (TA)
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The ATMEGA8535-16AU is the direct functional equivalent for the obsolete ATMEGA8535-16AC. Selection of the ATMEGA8535-16AU is supported by:

Active Product Status: The ATMEGA8535-16AU maintains active manufacturing status, ensuring continued availability and supply chain reliability compared to the obsolete ATMEGA8535-16AC.
Enhanced Compliance: The ATMEGA8535-16AU meets ROHS3 compliance requirements, whereas the ATMEGA8535-16AC is non-compliant. This distinction is relevant for applications subject to RoHS regulations.
Extended Operating Temperature Range: The ATMEGA8535-16AU supports -40°C to 85°C operation, providing broader environmental tolerance than the ATMEGA8535-16AC (0°C to 70°C). Applications requiring extended temperature performance benefit from this specification.
Identical Electrical and Functional Specifications: All core electrical parameters, memory configuration, peripheral functionality, and package format are identical, ensuring drop-in compatibility in existing circuit designs.

Frequently Asked Questions (FAQ)

Q: Can the ATMEGA8535-16AU directly replace the ATMEGA8535-16AC in existing designs?

A: Yes. The ATMEGA8535-16AU is electrically and functionally identical to the ATMEGA8535-16AC across all critical parameters including processor architecture, memory configuration, operating frequency, peripheral set, I/O count, and package format. No circuit modifications are required.

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

A: The primary differences are product status, operating temperature range, and compliance certification. The ATMEGA8535-16AC is obsolete with 0°C to 70°C operation and RoHS non-compliance. The ATMEGA8535-16AU is active with -40°C to 85°C operation and ROHS3 compliance. Electrical and functional specifications are identical.

Q: Why is the ATMEGA8535-16AC listed as obsolete?

A: Microchip Technology has discontinued the ATMEGA8535-16AC from active production. The ATMEGA8535-16AU serves as the current production equivalent with identical functionality and enhanced compliance certifications.

Q: Are there any compatibility concerns with the 44-TQFP package?

A: No. Both the ATMEGA8535-16AC and ATMEGA8535-16AU use identical 44-TQFP (10x10) surface mount packaging. PCB footprints, soldering processes, and mechanical mounting are fully compatible.

Q: Does the extended operating temperature range of the ATMEGA8535-16AU affect my application?

A: The extended temperature range (-40°C to 85°C) of the ATMEGA8535-16AU is a superset of the ATMEGA8535-16AC range (0°C to 70°C). Applications operating within the original 0°C to 70°C window experience no change in performance. Applications requiring operation below 0°C or above 70°C benefit from the expanded range.

Q: Is RoHS compliance a requirement for my application?

A: RoHS compliance depends on your application's regulatory requirements and target markets. The ATMEGA8535-16AU meets ROHS3 standards, while the ATMEGA8535-16AC does not. Verify your compliance obligations before component selection.

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