ATMEGA8535-16PI Equivalent & Substitute Parts

Part Overview

The ATMEGA8535-16PI 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 supply voltage range of 4.5V to 5.5V and includes integrated peripherals such as I2C, SPI, UART/USART connectivity, PWM, watchdog timer, and brown-out detection. The part is mounted in a 40-pin DIP package with 32 I/O pins and an 8-channel 10-bit analog-to-digital converter.

The ATMEGA8535-16PI is classified as obsolete. Locating equivalent substitute parts is necessary for ongoing production support, design updates, and inventory management where original stock is depleted or unavailable.

Key Parameters

Parameter	Value
Core Processor	AVR
Core Size	8-Bit
Operating Speed	16MHz
Program Memory	8KB (4K x 16) FLASH
EEPROM Size	512 x 8
RAM Size	512 x 8
I/O Pins	32
Supply Voltage	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
Package Type	40-DIP (0.600", 15.24mm)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution of the ATMEGA8535-16PI 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
Supply Voltage Range: 4.5V ~ 5.5V
Peripheral Set: I2C, SPI, UART/USART, PWM, WDT, brown-out detection
I/O Count: 32 pins
Package Form Factor: 40-pin DIP with 0.600" (15.24mm) pitch
Mounting Technology: Through-hole

The ATMEGA8535-16PU qualifies as a direct substitute because it maintains identical electrical specifications, memory configuration, peripheral functionality, and physical package dimensions. The difference between these parts is limited to packaging format (DIP vs. tube) and product status (obsolete vs. active).

Parameter Comparison

Parameter	ATMEGA8535-16PI	ATMEGA8535-16PU	Match
Manufacturer	Microchip Technology	Microchip Technology	✓
Core Processor	AVR	AVR	✓
Core Size	8-Bit	8-Bit	✓
Operating Speed	16MHz	16MHz	✓
Program Memory	8KB (4K x 16) FLASH	8KB (4K x 16) FLASH	✓
EEPROM Size	512 x 8	512 x 8	✓
RAM Size	512 x 8	512 x 8	✓
I/O Pins	32	32	✓
Supply Voltage	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	-40°C ~ 85°C	✓
Package Type	40-DIP (0.600", 15.24mm)	40-DIP (0.600", 15.24mm)	✓
Mounting Type	Through Hole	Through Hole	✓
Product Status	Obsolete	Active	Different
RoHS Compliance	RoHS non-compliant	ROHS3 Compliant	Different

Engineering Selection Recommendations

The ATMEGA8535-16PU is a direct functional and electrical equivalent to the ATMEGA8535-16PI. Both parts share identical core architecture, memory specifications, operating frequency, supply voltage requirements, peripheral functionality, and physical package dimensions.

The primary distinctions are:

Product Status: The ATMEGA8535-16PI is classified as obsolete, while the ATMEGA8535-16PU maintains active product status. For new designs or ongoing production requiring long-term component availability, the ATMEGA8535-16PU is the appropriate selection.

RoHS Compliance: The ATMEGA8535-16PI is RoHS non-compliant. The ATMEGA8535-16PU is ROHS3 compliant, meeting current environmental and regulatory standards for electronic components in most jurisdictions.

Packaging Format: The ATMEGA8535-16PI is supplied in standard DIP packaging, while the ATMEGA8535-16PU is supplied in tube packaging. Both formats accommodate identical through-hole PCB assembly processes.

Selection of the ATMEGA8535-16PU is supported by active product status, regulatory compliance, and equivalent electrical performance.

Frequently Asked Questions (FAQ)

Q: Are the ATMEGA8535-16PI and ATMEGA8535-16PU pin-compatible?

A: Yes. Both parts use the 40-pin DIP package with 0.600" (15.24mm) pitch. Pin assignments, I/O functionality, and signal definitions are identical. Direct PCB substitution is possible without layout modification.

Q: What is the difference between the "-PI" and "-PU" suffixes?

A: The suffix designates packaging format. "-PI" indicates standard DIP packaging, while "-PU" indicates tube packaging. The electrical specifications and functional performance are identical.

Q: Can the ATMEGA8535-16PU replace the ATMEGA8535-16PI in existing designs?

A: Yes. The ATMEGA8535-16PU is a direct substitute. No circuit modifications, firmware changes, or PCB redesign are required. The parts are functionally and electrically equivalent.

Q: Why is the ATMEGA8535-16PI classified as obsolete?

A: The ATMEGA8535-16PI has reached end-of-life status with Microchip Technology. The ATMEGA8535-16PU remains in active production and is the recommended part for new designs and ongoing production support.

Q: Does the ATMEGA8535-16PU meet current RoHS requirements?

A: Yes. The ATMEGA8535-16PU is ROHS3 compliant. The ATMEGA8535-16PI is RoHS non-compliant. For applications subject to RoHS regulations, the ATMEGA8535-16PU is required.

Q: Are there memory or performance differences between these parts?

A: No. Both parts feature 8KB FLASH program memory, 512 bytes EEPROM, 512 bytes RAM, 16MHz operating frequency, and identical peripheral functionality. Memory capacity and performance are equivalent.

Q: What is the supply voltage requirement for the ATMEGA8535-16PU?

A: The supply voltage range is 4.5V to 5.5V for both parts. Circuit design and power supply specifications remain unchanged when substituting the ATMEGA8535-16PU.

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