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HomeProductsIntegrated Circuits (ICs)Embedded - MicrocontrollersATMEGA8535-16PU
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ATMEGA8535-16PU - Microchip Technology

Manufacturer Part Number
ATMEGA8535-16PU
Manufacturer
Microchip Technology
Allelco Part Number
32D-ATMEGA8535-16PU
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
10,616 pcs available, New & Original
Parts Description
IC MCU 8BIT 8KB FLASH 40DIP
Package
40-PDIP
Data sheet
ATMEGA8535-16PU.pdf

PCN Assembly/Origin

Mult Dev Assembly 28/May/2020.pdf
RoHs Status
ROHS3 Compliant
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In stock: 10616

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Specifications

ATMEGA8535-16PU Tech Specifications
Microchip Technology - ATMEGA8535-16PU technical specifications, attributes, parameters and parts with similar specifications to Microchip Technology - ATMEGA8535-16PU

Product Attribute Attribute Value
Manufacturer Microchip Technology
Voltage - Supply (Vcc/Vdd) 4.5V ~ 5.5V
Supplier Device Package 40-PDIP
Speed 16MHz
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 40-DIP (0.600", 15.24mm)
Package Tube
Product Attribute Attribute Value
Oscillator Type Internal
Operating Temperature -40°C ~ 85°C (TA)
Number of I/O 32
Mounting Type Through Hole
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 ROHS3 Compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8542.31.0001

Parts Introduction

ATMEGA8535-16PU Image
ATMEGA8535-16PU (1)

Manufacturer Part Number

ATMEGA8535-16PU

Manufacturer

Microchip Technology

Introduction

The ATMEGA8535-16PU is part of Microchip's popular AVR ATmega series of 8-bit microcontrollers, designed for a broad range of applications and known for its reliability and performance.

Product Features and Performance

8-Bit AVR Core Processor

16MHz Clock Speed

32 Programmable I/O Lines

8KB Flash Memory

512 Bytes EEPROM

512 Bytes Internal SRAM

In-system Programmable via SPI Port

Internal Oscillator for Simplified Operation

Product Advantages

High Performance with Low Power Consumption

Advanced RISC Architecture with 32 x 8 General Purpose Working Registers

Fully Static Operation for Power Saving

Up to 16 MIPS Throughput at 16 MHz

ATMEGA8535-16PU Image
ATMEGA8535-16PU (2)

Key Technical Parameters

I2C, SPI, UART/USART Connectivity

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

A/D Converter with 8 Channels and 10-bit Resolution

Operating Voltage Range of 4.5V to 5.5V

Through Hole Mounting with 40-PDIP Packaging

Quality and Safety Features

Extended Temperature Range from -40°C to 85°C

Data Retention Rated for 20 years at 85°C

Compatibility

Compatible with Microchip's Range of Development Tools and Software

Application Areas

Industrial Control Systems

Automotive

Consumer Electronics

Internet of Things (IoT) Devices

Robotics and Automation

Product Lifecycle

Active Status with Continued Manufacturer Support

Not Nearing Discontinuation

Several Key Reasons to Choose This Product

Robust Instruction Set Facilitates Programming and Reduces Time to Market

On-chip Debug Capability Improves Productivity

Wide Ecosystem of Development Tools and Community Support

Suitable for both Rapid Prototyping and Volume Production

Scalable Line of Microcontrollers for Future Upgrades

Frequently Asked Questions(FAQ)

How does the ATMEGA8535-16PU’s power consumption profile compare to other AVR MCUs in similar performance ranges, and what design considerations arise when operating at 5V versus 4.5V?
The ATMEGA8535-16PU draws approximately 1.8 mA during active operation at 16 MHz and 5V supply, scaling proportionally with voltage. At 4.5V, current drops by roughly 10%, which can extend battery life in portable applications but may affect timing margins due to slower internal oscillator drift. Compared to higher-end AVRs like the ATmega328P, the ATMEGA8535 trades reduced peripheral count for lower standby current—around 1 µA in power-down mode—making it suitable for energy-constrained designs where I/O flexibility outweighs memory expansion needs.
What are the key trade-offs between using the internal oscillator versus an external crystal on the ATMEGA8535-16PU, especially in precision-critical applications requiring UART or SPI communication over longer distances?
While the ATMEGA8535-16PU includes a calibrated 16 MHz internal RC oscillator (±10% accuracy), this variation can cause UART baud rate errors exceeding 5% under worst-case conditions, potentially leading to frame synchronization failures in asynchronous serial links beyond 1–2 meters. External crystals offer better stability (±30 ppm typical), reducing timing skew in multi-device SPI networks or RS-485 systems. However, adding an external resonator increases PCB real estate, cost, and assembly complexity. For most embedded control tasks with moderate speed requirements, the internal oscillator suffices if compensated via software calibration.
Can the ATMEGA8535-16PU reliably drive capacitive loads on its GPIO pins, and how should output stage configuration be managed when interfacing with modern LCD modules or long ribbon cables?
The ATMEGA8535-16PU’s CMOS outputs have limited sink/source capability (~20 mA per pin), which is generally adequate for low-speed digital signals but insufficient for directly driving high-capacitance loads such as unshielded flat cables (>100 pF) or multiplexed LCD segments without buffering. In such cases, series termination resistors (typically 100–470 Ω) help dampen ringing, while push-pull outputs should be enabled via PORTx registers rather than leaving pins floating or set as inputs. For critical signal integrity, consider inserting a buffer IC like the 74HC244 near the microcontroller.
How does the EEPROM endurance specification of the ATMEGA8535-16PU influence system-level data logging strategies, and what write cycle management practices are recommended for mission-critical parameter storage?
The ATMEGA8535-16PU guarantees 100,000 erase/write cycles on its 512-byte EEPROM at rated temperature. Assuming one parameter update per hour, this equates to approximately 11 years of continuous writes—sufficient for most firmware-controlled settings. However, aggressive logging (e.g., thousands of writes/day) will degrade memory well before end-of-life. Best practice involves batching writes into RAM buffers and committing them periodically, avoiding repeated updates to the same address. Additionally, implementing wear-leveling logic across multiple logical-to-physical address mappings significantly extends effective EEPROM lifespan.
What limitations exist in the analog front-end of the ATMEGA8535-16PU’s ADC when measuring slow-changing sensor signals, and how do input impedance and sampling capacitor effects impact measurement accuracy?
The ATMEGA8535-16PU features an 8-channel, 10-bit successive approximation ADC with ~13 clock cycle conversion time per channel. Its input impedance varies from ~30 kΩ to >1 GΩ depending on pin state, but during sampling, the internal switched-capacitor network presents a transient load that can interact with high-impedance sources like thermistors or piezoelectric sensors. To minimize settling errors, source impedances should stay below ~10 kΩ, and oversampling techniques combined with digital filtering improve effective resolution to ~12 bits for slowly varying signals. Always ensure proper decoupling on AVCC and use external reference voltages (e.g., AREF = 2.56 V) for stable gain.
When selecting between the ATMEGA8535-16PU and the ATMEGA8535L variant, what factors determine whether a low-power sub-1 GHz application justifies the additional cost of the -L version?
The ATMEGA8535L operates at reduced frequencies (up to 8 MHz) and consumes significantly less power in sleep modes due to lower core voltage scaling. If your design uses the internal oscillator at 8 MHz or less and leverages power-down modes more than 90% of the time, the L-variant reduces total system power draw by up to 60%. However, if you require full 16 MHz performance or rely heavily on interrupt-driven responsiveness, the standard ATMEGA8535-16PU offers better dynamic efficiency despite higher static current. Choose the -L only when battery longevity outweighs processing throughput demands.
How should bootloader implementation affect flash programming reliability on the ATMEGA8535-16PU, particularly regarding lock bit configurations and stack pointer initialization?
Bootloaders on the ATMEGA8535-16PU must preserve the reset vector and avoid overwriting critical interrupt vectors unless using a custom layout. Incorrect lock bit settings (e.g., disabling RWW protection) can render code unreadable via ISP. Additionally, bootloader routines should initialize the stack pointer early in execution to prevent crashes during nested interrupts. Most open-source bootloaders assume a 4 KB boot section; misalignment here causes hard faults when jumping from application to bootloader. Verify fuse settings match your physical hardware layout before deployment.
What thermal constraints apply when mounting the ATMEGA8535-16PU in a densely populated 40-pin DIP package, and how does junction temperature affect long-term reliability in industrial environments?
With a maximum junction-to-ambient thermal resistance (θJA) of ~75°C/W in still air, the ATMEGA8535-16PU can experience a 120°C rise above ambient when dissipating 1.6 W—exceeding its 85°C maximum case temperature at 16 MHz. In sealed enclosures without airflow, derating to ≤10 MHz operation is advisable. Prolonged exposure to temperatures near 80°C accelerates electromigration in bond wires, potentially causing latent defects. Ensure adequate copper pour on adjacent layers and avoid routing high-current traces beneath the MCU to maintain thermal headroom.

Parts with Similar Specifications

The three parts on the right have similar specifications to Microchip Technology ATMEGA8535-16PU

Product Attribute ATMEGA8535-16PI ATMEGA8535-16PC ATMEGA8535-16PI ATMEGA8535-16MU
Part Number ATMEGA8535-16PI ATMEGA8535-16PC ATMEGA8535-16PI ATMEGA8535-16MU
Manufacturer Microchip Technology Microchip Technology Atmel Microchip Technology
Data Converters - - - -
RAM Size - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Number of I/O - - - -
Core Processor - - - -
Series - - - -
Core Size - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
EEPROM Size - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Speed - - - -
Peripherals - - - -
Program Memory Type - - - -
Oscillator Type - - - -
Connectivity - - - -
Voltage - Supply (Vcc/Vdd) - - - -
Program Memory Size - - - -

ATMEGA8535-16PU Datasheet PDF

Download ATMEGA8535-16PU pdf datasheets and Microchip Technology documentation for ATMEGA8535-16PU - Microchip Technology.

Datasheets
ATMEGA8535(L) Complete.pdf ATMEGA8535(L) Summary.pdf
PCN Packaging
Boxes 07/Dec/2016.pdf Shipping Tube 19/Sep/2018.pdf
PCN Design/Specification
Copper Bonding Wire 17/Oct/2013.pdf Marking Chgs 11/Jul/2017.pdf
PCN Assembly/Origin
Mult Dev Assembly 28/May/2020.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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Delivery Time

In-stock items can be shipped within 24 hours. Some parts will be arranged for delivery within 1-2 days from the date all items arrive at our warehouse. And Allelco ships order once a day at about 17:00, except Sunday. Once the goods are shipped, the estimated delivery time depends on the shipping methods and Delivery destination. The table below shows are the logistic time for some common countries.

Delivery Cost

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Delivery Method

  1. Global Common Shipment by DHL / UPS / FedEx / TNT / EMS / SF we support.
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Common Countries Logistic Time Reference
Region Country Logistic Time(Day)
America United States 5
Brazil 7
Europe Germany 5
United Kingdom 4
Italy 5
Oceania Australia 6
New Zealand 5
Asia India 4
Japan 4
Middle East Israel 6
DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
The above table is for reference only. There may have some data bias for the uncontrollable factors.
Contact us if you have any questions.
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Allelco is committed to exceeding customer expectations through customer service excellence, order accuracy, and on-time delivery.
This is achieved through our commitment to the continual improvement of our processes, services, and products.


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Electrostatic Discharge Protection and Handling

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ATMEGA8535-16PU Image

ATMEGA8535-16PU

Microchip Technology
32D-ATMEGA8535-16PU

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