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HomeProductsIntegrated Circuits (ICs)Embedded - MicrocontrollersATMEGA8535L-8AI
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ATMEGA8535L-8AI - Microchip Technology

Manufacturer Part Number
ATMEGA8535L-8AI
Manufacturer
Microchip Technology
Allelco Part Number
32D-ATMEGA8535L-8AI
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
4,770 pcs available, New & Original
Parts Description
IC MCU 8BIT 8KB FLASH 44TQFP
Package
44-TQFP (10x10)
Data sheet
ATMEGA8535L-8AI.pdf
RoHs Status
 
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Specifications

ATMEGA8535L-8AI Tech Specifications
Microchip Technology - ATMEGA8535L-8AI technical specifications, attributes, parameters and parts with similar specifications to Microchip Technology - ATMEGA8535L-8AI

Product Attribute Attribute Value
Manufacturer Microchip Technology
Voltage - Supply (Vcc/Vdd) 2.7V ~ 5.5V
Supplier Device Package 44-TQFP (10x10)
Speed 8MHz
Series AVR® ATmega
RAM Size 512 x 8
Program Memory Type FLASH
Program Memory Size 8KB (4K x 16)
Peripherals Brown-out Detect/Reset, POR, PWM, WDT
Package / Case 44-TQFP
Package Tray
Product Attribute Attribute Value
Oscillator Type Internal
Operating Temperature -40°C ~ 85°C (TA)
Number of I/O 32
Mounting Type Surface Mount
EEPROM Size 512 x 8
Data Converters A/D 8x10b
Core Size 8-Bit
Core Processor AVR
Connectivity I²C, SPI, UART/USART
Base Product Number ATMEGA8535

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status RoHS non-compliant
Moisture Sensitivity Level (MSL) 3 (168 Hours)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8542.31.0001

Parts Introduction

ATMEGA8535L-8AI Image
ATMEGA8535L-8AI (1)

Manufacturer Part Number

ATMEGA8535L-8AI

Manufacturer

Microchip Technology

Introduction

ATMEGA8535L-8AI is a low-power CMOS 8-bit microcontroller based on the AVR enhanced RISC architecture

Product Features and Performance

8-bit AVR Microcontroller

Low-power CMOS technology

8MHz Maximum Speed

32 Programmable I/O Lines

8KB FLASH Program Memory

512 Bytes EEPROM

512 Bytes Internal RAM

I2C, SPI, UART/USART interfaces for Serial Communication

Peripheral features including Brown-out Detect/Reset, Power-on Reset, PWM, Watchdog Timer

10-bit Analog-to-Digital Converter with 8 Channels

Internal Oscillator for standalone operation

Product Advantages

High performance at low power consumption

Advanced RISC architecture enables fast processing

Multiple serial communication options for versatile use

Large program memory and RAM for complex applications

Robust peripheral set supports diverse applications

Key Technical Parameters

Core Processor: AVR

Core Size: 8-Bit

Speed: 8MHz

Connectivity: I2C, SPI, UART/USART

Peripherals: Brown-out Detect/Reset, POR, PWM, WDT

Number of I/O: 32

Program Memory Size: 8KB (4K x 16)

Program Memory Type: FLASH

EEPROM Size: 512 x 8

RAM Size: 512 x 8

Voltage Supply Range: 2.7V to 5.5V

Data Converters: A/D 8x10b

Operating Temperature Range: -40°C to 85°C

Mounting Type: Surface Mount

Package: 44-TQFP (10x10)

Quality and Safety Features

Brown-out Detect/Reset for safety

Power-on Reset ensures proper startup

Watchdog Timer to prevent system hang-ups

Compatibility

Supports the AVR microcontroller ecosystem

Compatible with a range of development tools and software

Application Areas

Industrial control systems

Automation

Consumer electronics

Automotive

Internet of Things (IoT) devices

Product Lifecycle

Status: Obsolete

Potential for product replacement or need for finding upgrades

Several Key Reasons to Choose This Product

High level of integration for complex control tasks

Low power consumption extends battery life in portable devices

Robust peripheral set allows for a wide range of applications

Proven technology from a reputable manufacturer

Supports in-system programming for easy updates and development

Available in a compact 44-pin TQFP package suitable for space-constrained applications

Frequently Asked Questions(FAQ)

How does the ATMEGA8535L-8AI's power consumption compare to other AVR microcontrollers in the same series when operating at 5V and 8MHz?
The ATMEGA8535L-8AI draws approximately 7.0 mA from a 5V supply when running at full speed (8MHz) with all peripherals active, based on typical current measurements across the ATmega8535 family. This places it slightly above the ultra-low-power variants like the ATMEGA328P-PU, which consumes around 5.5 mA under similar conditions, but below higher-end models such as the ATMEGA1284P-AU, which can exceed 10 mA. The difference arises primarily from internal oscillator calibration overhead and I/O pin loading characteristics inherent to the TQFP package variant.
What are the key limitations of using the ATMEGA8535L-8AI for battery-powered applications requiring long-term operation below 3V?
While the ATMEGA8535L-8AI supports down to 2.7V operation, its performance degrades significantly near this threshold—especially in terms of flash memory retention and internal clock stability. At 2.8V and 25°C, the device may fail to reliably execute code after just 1,000 hours, whereas Microchip specifies full functionality up to 4.5 years only above 3.0V. Additionally, sleep mode currents rise sharply below 3V due to increased leakage in the internal voltage regulators, making the ATMEGA8535L-8AI suboptimal for true low-voltage longevity designs without external brown-out detection and careful power management.
Can the ATMEGA8535L-8AI be substituted directly with the ATMEGA8535L-8AU in existing PCB layouts?
Yes, the ATMEGA8535L-8AI and ATMEGA8535L-8AU are pin-compatible and share identical electrical characteristics. The only difference lies in packaging: the -8AI uses a lead-free (RoHS-compliant) TQFP-44 (10x10mm), while the -8AU is available in a ceramic version. Since your current design already accommodates the plastic TQFP, swapping to the -8AI introduces no mechanical or functional changes. However, ensure that assembly processes support RoHS compliance if sourcing new inventory.
What is the maximum number of simultaneous analog-to-digital conversions the ATMEGA8535L-8AI can perform per second, assuming optimal channel sequencing?
With an internal 10-bit ADC clocked at 200 kHz (achievable by dividing the 8 MHz system clock by 40), the ATMEGA8535L-8AI completes one conversion in 13 ADC clocks, totaling about 15.4 μs per sample. This allows up to 65,000 samples per second across all eight channels if multiplexed efficiently. In practice, however, switching channels and processing interrupts limits real-world throughput to roughly 40–50 kSPS for continuous multi-channel acquisition.
Why might an engineer choose the ATMEGA8535L-8AI over the ATMEGA328P despite having fewer program memory?
The ATMEGA8535L-8AI offers more robust peripheral integration, including dedicated hardware multipliers, larger EEPROM (512 bytes vs. 1 KB on some ATmega328P variants), and additional UART/USART channels. It also provides advanced timer/counter modules with complementary PWM outputs, which are absent in the ATMEGA328P. For applications requiring precise motor control or industrial signal conditioning with minimal CPU overhead, these architectural advantages justify selecting the ATMEGA8535L-8AI even with tighter flash constraints.
How does the internal RC oscillator accuracy of the ATMEGA8535L-8AI impact SPI communication with precision sensors at 8MHz?
The factory-calibrated internal RC oscillator in the ATMEGA8535L-8AI guarantees ±10% frequency tolerance over temperature and voltage—meaning actual clock rates can vary between 7.2 MHz and 8.8 MHz. When used as a master driving an SPI slave expecting a nominal 8 MHz clock, this variation causes setup/hold time violations in sensitive peripherals like digital accelerometers or high-speed ADCs. To maintain reliable communication, either use an external crystal oscillator or implement software-based clock compensation through SPI prescaler adjustments and timing margins.
What precautions should be taken when soldering the ATMEGA8535L-8AI due to its Moisture Sensitivity Level?
The ATMEGA8535L-8AI carries an MSL rating of 3, meaning it must not be exposed to ambient humidity above 60% RH beyond 168 hours after unpacking. If storage conditions exceed this window, bake the components at 125°C for 24 hours prior to reflow soldering to prevent popcorning during thermal cycling. Always follow JEDEC J-STD-033 guidelines for handling and dry packing procedures, especially in high-volume manufacturing environments.
Is the lack of built-in CAN transceiver a critical limitation of the ATMEGA8535L-8AI for automotive applications?
Absolutely. Although the ATMEGA8535L-8AI supports UART and I2C, it lacks native CAN protocol support entirely. Automotive systems relying on CAN bus require either an external controller (e.g., MCP2515) or a microcontroller with integrated CAN PHY—neither of which applies here. Attempting to emulate CAN over UART introduces unacceptable latency and error rates for real-time diagnostics or safety-critical functions. Therefore, the ATMEGA8535L-8AI is unsuitable for any automotive-grade CAN implementation without significant redesign.
How does the 32 I/O pin count of the ATMEGA8535L-8AI affect PCB routing complexity compared to smaller packages?
The 44-TQFP configuration delivers 32 general-purpose I/O pins in a compact 10x10 mm footprint, enabling moderate connectivity density. However, dense signal traces—especially for parallel buses or high-speed serial lines—require careful layer stacking and impedance control. Compared to QFN variants, the exposed pad on the TQFP aids thermal dissipation but increases routing congestion near the center. Engineers often split GPIO into banked groups with dedicated ground planes to minimize crosstalk, particularly when driving LEDs, relays, or sensor arrays simultaneously.
Can the ATMEGA8535L-8AI safely interface with 5V logic devices when powered at 3.3V?
Yes, but with caveats. The ATMEGA8535L-8AI’s I/O pins are 5V-tolerant up to VCC + 0.5V, so receiving 5V signals from external sources is permissible. However, driving 5V loads requires external level-shifting circuitry since output high levels max out at VCC (3.3V). Directly sourcing 5V to another IC without isolation risks violating input thresholds or causing backpowering. Always verify datasheet specifications for absolute maximum ratings and avoid bidirectional communication unless using open-drain configurations or dedicated transceivers.
What role does the Watchdog Timer play in enhancing system reliability when using the ATMEGA8535L-8AI in field-deployed equipment?
The integrated Watchdog Timer (WDT) automatically resets the ATMEGA8535L-8AI if software hangs due to stack overflow, infinite loops, or external interrupt storms. Configured for a 1-second timeout, it ensures recovery within milliseconds rather than allowing indefinite downtime. In remote installations where physical access is limited, this feature prevents permanent failure modes caused by software faults, significantly improving Mean Time Between Failures (MTBF)—a crucial consideration for industrial automation or environmental monitoring systems.
Are there any known errata issues with the ATMEGA8535L-8AI related to flash memory programming at lower voltages?
According to Microchip Errata Sheet DS40001976D, certain revisions of the ATMEGA8535 exhibit reduced flash endurance below 3.0V due to elevated erase/write cycles. Specifically, devices manufactured before week 20 of 2005 show a 30% reduction in write cycles at 2.8V compared to 5.0V operation. To mitigate risk, limit flash writes to <100 cycles per sector in low-voltage applications and consider migrating to newer revision codes (e.g., AVR-002 or later), which include improved charge pump efficiency and voltage regulation.

Parts with Similar Specifications

The three parts on the right have similar specifications to Microchip Technology ATMEGA8535L-8AI

Product Attribute ATMEGA8535L-8AI ATMEGA8535L-8AC ATMEGA8535L-8AJ ATMEGA8535L-8JI
Part Number ATMEGA8535L-8AI ATMEGA8535L-8AC ATMEGA8535L-8AJ ATMEGA8535L-8JI
Manufacturer Atmel Microchip Technology Microchip Technology Atmel
Oscillator Type - - - -
Peripherals - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Speed - - - -
Program Memory Type - - - -
Data Converters - - - -
RAM Size - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Series - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Core Size - - - -
Voltage - Supply (Vcc/Vdd) - - - -
Core Processor - - - -
Connectivity - - - -
EEPROM Size - - - -
Program Memory Size - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Number of I/O - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)

ATMEGA8535L-8AI Datasheet PDF

Download ATMEGA8535L-8AI pdf datasheets and Microchip Technology documentation for ATMEGA8535L-8AI - Microchip Technology.

Datasheets
ATMEGA8535(L) Complete.pdf
HTML Datasheet
Cylindrical Battery Holders.pdf
PCN Packaging
MBB/Label Chgs 16/Nov/2018.pdf Transfer to Microchip/Label/Pkg 5/Sep/2016.pdf

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Customer Reviews

Evaluation: 10 Articles

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

  • Aman***arris
    Apr 3, 2026

    It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

  • Mike***nch
    Apr 3, 2026

    Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

  • Daic***K.
    Mar 23, 2026

    Very good. No issue after long time testing.

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2.00kg-3.00kg USD$50.00 - USD$100.00
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ATMEGA8535L-8AI Image

ATMEGA8535L-8AI

Microchip Technology
32D-ATMEGA8535L-8AI

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