ATMEGA8535-16PC Equivalent & Substitute Parts

Part Overview

The ATMEGA8535-16PC 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. Operating at 16MHz with a 40-pin DIP package, this device integrates I2C, SPI, and UART/USART connectivity alongside PWM, watchdog timer, and brown-out detection peripherals.

The ATMEGA8535-16PC carries an Obsolete product status. Locating equivalent substitute parts is necessary for ongoing system support, maintenance, and new production runs where original inventory becomes unavailable.

Key Parameters

Parameter	Value
Manufacturer	Microchip Technology
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
Voltage Supply (Vcc/Vdd)	4.5V ~ 5.5V
Number of I/O	32
Data Converters	A/D 8x10b
Connectivity	I2C, SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT
Mounting Type	Through Hole
Package / Case	40-DIP (0.600", 15.24mm)
Supplier Device Package	40-PDIP

Substitute Part Grouping Explanation

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

Core Architecture: AVR processor family
Memory Configuration: 8KB FLASH, 512 x 8 EEPROM, 512 x 8 RAM
Operating Frequency: 16MHz
Supply Voltage Range: 4.5V ~ 5.5V
I/O Count: 32 pins
Peripheral Set: I2C, SPI, UART/USART, PWM, WDT, brown-out detection
Package Type: 40-pin DIP form factor
Pin Compatibility: Identical pinout required

The ATMEGA8535-16PU qualifies as a direct substitute based on identical electrical specifications, memory configuration, and pinout. Differences in product status, operating temperature range, and packaging format do not affect functional interchangeability in applications designed for the ATMEGA8535-16PC.

Parameter Comparison

Parameter	ATMEGA8535-16PC	ATMEGA8535-16PU
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
Voltage - Supply (Vcc/Vdd)	4.5V ~ 5.5V	4.5V ~ 5.5V
Number of I/O	32	32
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
Mounting Type	Through Hole	Through Hole
Package / Case	40-DIP (0.600", 15.24mm)	40-DIP (0.600", 15.24mm)
Supplier Device Package	40-PDIP	40-PDIP
Product Status	Obsolete	Active
Operating Temperature	0°C ~ 70°C (TA)	-40°C ~ 85°C (TA)
RoHS Status	RoHS non-compliant	ROHS3 Compliant
Packaging Format	Loose	Tube

Engineering Selection Recommendations

The ATMEGA8535-16PU is the direct functional equivalent of the ATMEGA8535-16PC. Both devices share identical core architecture, memory configuration, operating frequency, supply voltage, I/O count, and peripheral set. Pin-for-pin compatibility is maintained across all 40 pins.

Selection of the ATMEGA8535-16PU is supported by its Active product status, ensuring continued availability and supply chain stability. The ATMEGA8535-16PU carries ROHS3 compliance, meeting modern environmental and regulatory requirements. The extended operating temperature range of -40°C to 85°C provides broader thermal operating margins compared to the ATMEGA8535-16PC specification of 0°C to 70°C.

The ATMEGA8535-16PC remains functionally interchangeable in applications where the narrower temperature range and RoHS non-compliance status are acceptable. Packaging differences (loose versus tube format) do not affect electrical performance or board-level integration.

Frequently Asked Questions (FAQ)

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

A: Yes. Both devices are pin-for-pin compatible with identical electrical specifications, memory configuration, and peripheral functionality. No circuit modifications are required.

Q: What is the difference between the ATMEGA8535-16PC and ATMEGA8535-16PU?

A: The primary differences are product status (Obsolete versus Active), operating temperature range (0°C ~ 70°C versus -40°C ~ 85°C), RoHS compliance status (non-compliant versus ROHS3 compliant), and packaging format (loose versus tube). Electrical and functional specifications are identical.

Q: Are there any compatibility concerns with the 40-DIP package?

A: No. Both parts use the identical 40-pin DIP package with 0.600" (15.24mm) spacing. PCB footprints and socket compatibility are maintained.

Q: Does the extended temperature range of the ATMEGA8535-16PU affect performance?

A: The extended temperature range (-40°C ~ 85°C) of the ATMEGA8535-16PU does not affect performance within the original operating specification of 0°C ~ 70°C. The wider range provides additional thermal margin for applications requiring extended environmental operation.

Q: Is the ATMEGA8535-16PU suitable for new production designs?

A: Yes. The ATMEGA8535-16PU carries Active product status and ROHS3 compliance, making it suitable for new production designs and long-term supply chain planning.

Q: What does the suffix difference between -16PC and -16PU indicate?

A: The suffix indicates the package type. The "C" denotes ceramic DIP packaging, while the "U" denotes plastic DIP packaging. Both maintain identical pinout and electrical specifications.

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