ATMEGA8535L-8MC Equivalent & Substitute Parts

Part Overview

The ATMEGA8535L-8MC 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 peripherals including I2C, SPI, and UART/USART interfaces. The part is classified as obsolete, necessitating identification of active equivalent components 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
Mounting Type	Surface Mount
Package	44-VQFN (7x7)
Operating Temperature	0°C ~ 70°C (TA)

Substitute Part Grouping Explanation

Substitution of the ATMEGA8535L-8MC is determined by strict equivalence across core functional parameters: processor architecture (AVR), core size (8-Bit), clock speed (8MHz), program memory capacity (8KB FLASH), EEPROM size (512 x 8), RAM size (512 x 8), I/O count (32 pins), supply voltage range (2.7V ~ 5.5V), and package form factor (44-VQFN 7x7). The ATMEGA8535L-8MU qualifies as a direct substitute based on identical electrical specifications and pinout compatibility. Differences in product status, operating temperature range, RoHS compliance, and packaging format do not affect functional interchangeability in applications designed for the ATMEGA8535L-8MC.

Parameter Comparison

Parameter	ATMEGA8535L-8MC	ATMEGA8535L-8MU
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
Mounting Type	Surface Mount	Surface Mount
Package	44-VQFN (7x7)	44-VQFN (7x7)
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)	1 (Unlimited)	3 (168 Hours)

Engineering Selection Recommendations

The ATMEGA8535L-8MU is the direct functional equivalent for ATMEGA8535L-8MC applications. Selection between these parts is determined by compliance and production requirements rather than electrical performance.

For new designs and production environments requiring regulatory compliance, the ATMEGA8535L-8MU is the appropriate choice due to its active product status and ROHS3 compliance. The extended operating temperature range (-40°C ~ 85°C) of the ATMEGA8535L-8MU provides broader environmental coverage compared to the ATMEGA8535L-8MC (0°C ~ 70°C).

For legacy system maintenance or applications with existing ATMEGA8535L-8MC inventory, the ATMEGA8535L-8MC remains functionally compatible. The MSL rating difference (MSL 1 versus MSL 3) reflects different moisture sensitivity classifications; the ATMEGA8535L-8MU requires controlled storage conditions (168 hours at specified humidity).

Both parts share identical electrical specifications, pinout, and package form factor, ensuring direct substitution without circuit redesign.

Frequently Asked Questions (FAQ)

Q: Can ATMEGA8535L-8MU directly replace ATMEGA8535L-8MC in existing designs?

A: Yes. Both parts are electrically identical with matching pinout, package (44-VQFN 7x7), and functional specifications. No circuit modifications are required.

Q: What is the significance of the different operating temperature ranges?

A: The ATMEGA8535L-8MC operates from 0°C to 70°C, while the ATMEGA8535L-8MU operates from -40°C to 85°C. Selection depends on the application's environmental requirements. The extended range of the ATMEGA8535L-8MU accommodates industrial and automotive temperature specifications.

Q: Why is ATMEGA8535L-8MC classified as obsolete?

A: Obsolete status indicates the part is no longer in active production. The ATMEGA8535L-8MU serves as the active production equivalent.

Q: What does RoHS3 compliance mean for the ATMEGA8535L-8MU?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead and other hazardous materials. This is required for many commercial and industrial applications.

Q: How does MSL rating affect component handling?

A: MSL (Moisture Sensitivity Level) 1 indicates unlimited shelf life without moisture control. MSL 3 requires storage at controlled humidity levels for up to 168 hours before soldering. The ATMEGA8535L-8MU requires appropriate moisture-controlled storage and handling procedures.

Q: Are there packaging differences between these parts?

A: The ATMEGA8535L-8MC is supplied in standard packaging, while the ATMEGA8535L-8MU is supplied in Tray packaging. Both use the same 44-VQFN (7x7) component package.

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