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HomeProductsIntegrated Circuits (ICs)Embedded - MicrocontrollersATMEGA168PA-AN
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ATMEGA168PA-AN - Microchip Technology

Manufacturer Part Number
ATMEGA168PA-AN
Manufacturer
Microchip Technology
Allelco Part Number
32D-ATMEGA168PA-AN
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
20,372 pcs available, New & Original
Parts Description
IC MCU 8BIT 16KB FLASH 32TQFP
Package
32-TQFP (7x7)
Data sheet
ATMEGA168PA-AN.pdf

Errata

2.73KHz.pdf

PCN Assembly/Origin

2.73KHz.pdf
RoHs Status
ROHS3 Compliant
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In stock: 20372

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Specifications

ATMEGA168PA-AN Tech Specifications
Microchip Technology - ATMEGA168PA-AN technical specifications, attributes, parameters and parts with similar specifications to Microchip Technology - ATMEGA168PA-AN

Product Attribute Attribute Value
Manufacturer Microchip Technology
Voltage - Supply (Vcc/Vdd) 1.8V ~ 5.5V
Supplier Device Package 32-TQFP (7x7)
Speed 20MHz
Series AVR® ATmega
RAM Size 1K x 8
Program Memory Type FLASH
Program Memory Size 16KB (8K x 16)
Peripherals Brown-out Detect/Reset, POR, PWM, WDT
Package / Case 32-TQFP
Package Tray
Product Attribute Attribute Value
Oscillator Type Internal
Operating Temperature -40°C ~ 105°C (TA)
Number of I/O 23
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 ATMEGA168

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 3 (168 Hours)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8542.31.0001

Parts Introduction

ATMEGA168PA-AN Image
ATMEGA168PA-AN (1)

Manufacturer Part Number

ATMEGA168PA-AN

Manufacturer

Microchip Technology

Introduction

8-bit AVR RISC-based microcontroller with 16KB Flash, 1KB SRAM, and 512B EEPROM

Product Features and Performance

Powerful 8-bit AVR RISC-based CPU with up to 20 MIPS throughput at 20MHz

Advanced RISC Architecture with 130 powerful instructions, most in a single clock cycle

16KB of In-System Self-Programmable Flash program memory

1KB Internal SRAM

512 bytes of EEPROM

23 programmable I/O lines

8-channel 10-bit ADC

Dual 8-bit Timer/Counter with Separate Prescaler and Compare Mode

One 16-bit Timer/Counter with Separate Prescaler, Compare Mode, and Capture Mode

Real Time Counter with Separate Oscillator

Six PWM Channels

Watchdog Timer with Separate On-Chip Oscillator

Programmable Serial USART

SPI Serial Port

Brownout Detection with Programmable Trigger Level

Internal Bandgap Reference

On-chip Analog Comparator

Extensive Power Saving Modes: Idle, ADC Noise Reduction, Power-down, and Standby

Product Advantages

Low-power design

Wide operating voltage range: 1.8V to 5.5V

High performance and energy efficiency

Extensive peripheral set and flexible configuration

In-System Programmable via on-chip Boot Program

Non-volatile program and data memories

Peripheral features tailored for embedded control applications

Key Technical Parameters

8-bit AVR CPU

20MHz maximum operating frequency

16KB Flash program memory

1KB SRAM

512B EEPROM

23 I/O lines

8-channel 10-bit ADC

USART, SPI, and other communication interfaces

Quality and Safety Features

RoHS3 compliant

Wide operating temperature range: -40°C to 105°C

Compatibility

Compatible with other AVR ATmega series microcontrollers

Application Areas

Embedded control systems

Industrial automation

Home appliances

Automotive electronics

Medical equipment

IoT devices

Product Lifecycle

Active product, no plans for discontinuation

Replacement and upgrade options available within the AVR ATmega series

Key Reasons to Choose This Product

High performance and energy efficiency

Flexible peripheral set and configuration

Wide operating voltage and temperature ranges

In-System Programmable via on-chip Boot Program

Extensive ecosystem and development tools support

Long-term availability and continuous product roadmap

Frequently Asked Questions(FAQ)

How does the ATMEGA168PA-AN’s operating voltage range of 1.8V to 5.5V influence system design in battery-powered applications?
The wide supply voltage tolerance enables flexible power architectures, allowing the ATMEGA168PA-AN to operate efficiently from single-cell lithium coin batteries down to ultra-low-voltage regulators. At 1.8V operation, current consumption drops significantly compared to 5V systems, extending battery life in portable devices. Designers can use this flexibility to match power requirements across different subsystems without external level-shifting logic.
What are the performance implications of using the internal oscillator on the ATMEGA168PA-AN versus an external crystal at 20MHz?
While the internal oscillator provides cost and board space savings, it typically exhibits ±1% frequency accuracy over temperature and aging—insufficient for precise timing applications like UART baud rate generation or I2C clock stretching. External crystals offer better stability (±10–50 ppm), critical for USB CDC implementations or multi-device synchronization. For simple sensor polling at lower speeds, the internal oscillator may suffice but requires calibration code to compensate for drift.
Can the ATMEGA168PA-AN reliably drive multiple peripherals simultaneously while maintaining accurate ADC sampling?
Yes, provided proper attention to noise isolation. The device supports concurrent operation of SPI, UART, PWM, and ADC via interrupt-driven firmware. However, simultaneous switching on GPIO pins during high-speed data transfers can inject noise into analog ground paths. Separating digital and analog grounds and placing bypass capacitors near Vcc pins reduces interference. In practice, achieving 10-bit ADC resolution requires settling time management when other peripherals are active.
How does the 1K byte RAM limit affect real-time control algorithm implementation on the ATMEGA168PA-AN?
With only 1K bytes of SRAM, complex state machines or large lookup tables must be optimized. Real-time algorithms such as PID controllers should minimize stack usage, avoid dynamic memory allocation, and use fixed-size buffers. Data structures exceeding available RAM will cause crashes unless partitioned across program memory with efficient access patterns. Profiling memory usage early prevents runtime failures during peak load conditions.
What trade-offs exist between using the ATMEGA168PA-AN’s built-in watchdog timer versus implementing software-based fault detection?
The hardware WDT offers guaranteed recovery from hung states but consumes minimal power and cannot detect logical errors. Software monitoring adds overhead and may miss faults before they occur. Best practice combines both: the WDT handles unresponsive loops, while application-level checks validate sensor readings or communication integrity. This layered approach ensures robustness without sacrificing deterministic behavior.
How does the EEPROM size impact configuration storage strategies in embedded systems using the ATMEGA168PA-AN?
With 512 bytes of EEPROM, non-volatile settings like calibration offsets or user preferences fit comfortably. However, frequent write cycles (limited to ~100k writes) necessitate wear-leveling for long-term reliability. Instead of storing incremental changes, capture full configurations periodically or buffer writes in RAM until a save event. Avoid real-time logging; instead, batch transmit data to host systems for persistent storage.
Is the ATMEGA168PA-AN suitable for automotive environments requiring AEC-Q100 qualification?
No, the ATMEGA168PA-AN is not AEC-Q100 certified and operates only to 105°C junction temperature. While it functions within industrial temperature ranges, automotive-grade designs demanding full lifecycle validation under thermal cycling, EMI, and vibration must select alternative components explicitly qualified for automotive use. Misapplication risks functional failure in harsh environments despite nominal datasheet specifications.
How does the choice between TQFP and QFN packaging affect thermal performance and assembly yield for the ATMEGA168PA-AN?
The 32-TQFP (7x7) package features exposed pads and wider leads, improving heat dissipation compared to smaller QFNs. It also simplifies hand-soldering and rework during prototyping. However, QFN packages occupy less board area and have better signal integrity due to shorter lead lengths. High-current applications benefit from TQFP’s larger copper connections, though neither package exceeds the device’s thermal limits under normal loads.
What considerations apply when interfacing the ATMEGA168PA-AN with 3.3V sensors while powered by a 5V supply?
Direct connection risks damaging 3.3V-only sensors due to overvoltage on input pins. Level shifters or resistive dividers are required for bidirectional signals. Alternatively, configure unused I/O pins as inputs only and ensure all outputs from the MCU stay below 3.3V using internal pull-ups disabled and external resistors. Always verify logic thresholds meet both sides’ specifications to prevent undefined states.
Why might designers choose the ATMEGA168PA-AN over similar 8-bit MCUs with larger flash memory?
Despite having 16KB flash, the ATMEGA168PA-AN offers superior peripheral integration including dual USARTS, dedicated hardware multipliers, and advanced power-saving modes. For moderate-complexity tasks like sensor fusion or protocol bridging, its feature set justifies the constraint. Larger flash MCUs often sacrifice I/O count or add unnecessary cost if only basic functionality is needed. Evaluate based on peripheral requirements rather than memory alone.
How should firmware handle brown-out detection (BOD) configuration for stable operation across the ATMEGA168PA-AN’s full voltage range?
Enable BOD at 2.7V or 4.3V depending on minimum expected Vcc. Setting it too low risks erratic behavior during brief dips; too high may disable protection during legitimate low-power states. During brownouts, the BOD resets the MCU before voltages drop below safe levels. Test with variable bench supplies to confirm reset occurs within ±50mV of threshold, ensuring reliable startup under real-world conditions.

Parts with Similar Specifications

The three parts on the right have similar specifications to Microchip Technology ATMEGA168PA-AN

Product Attribute ATMEGA168PA-ANR ATMEGA168PA-15AZ ATMEGA168PA-AU ATMEGA168PA-AU
Part Number ATMEGA168PA-ANR ATMEGA168PA-15AZ ATMEGA168PA-AU ATMEGA168PA-AU
Manufacturer Microchip Technology Microchip Technology Microchip Technology Atmel
Oscillator Type - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Connectivity - - - -
Voltage - Supply (Vcc/Vdd) - - - -
Core Processor - - - -
Number of I/O - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Core Size - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Data Converters - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Program Memory Size - - - -
Program Memory Type - - - -
Speed - - - -
RAM Size - - - -
Peripherals - - - -
Series - - - -
EEPROM Size - - - -

ATMEGA168PA-AN Datasheet PDF

Download ATMEGA168PA-AN pdf datasheets and Microchip Technology documentation for ATMEGA168PA-AN - Microchip Technology.

Datasheets
Cylindrical Battery Holders.pdf
PCN Design/Specification
ATMEGA Datasheet 13/Dec/2018.pdf ATmega48A/PA/88A/PA/168A/PA/328/P 10/Sep/2020.pdf
Errata
2.73KHz.pdf
PCN Assembly/Origin
2.73KHz.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

  • Nath***rooks
    Jun 11, 2026

    Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.

  • 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.

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Shipment

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

  1. Use your express account for shipment if you have one.
  2. Use our account for the shipment. Refer to the table below for the approximate charges.
(Different time frame / countries / package size has different price.)

Delivery Method

  1. Global Common Shipment by DHL / UPS / FedEx / TNT / EMS / SF we support.
  2. Others more shipping ways, please get in touch with your customer manager.

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.
  • QC (Quality Warranty)
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QC (Quality Warranty)

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.


Strict quality inspection builds a solid foundation for electronic component quality.
  1. Visual inspection
  2. Performance testing and reliability verification
  3. Standardized full-process testing
  4. Precise control of every parameter
We eliminate defective components and ensure the stable operation of electronic devices through professional quality standards.
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Packaging

Electrostatic Discharge Protection and Handling

All electrostatic-sensitive components are handled in accordance with electrostatic discharge control procedures. The products are hermetically sealed in anti-static safe packaging to prevent electrostatic damage. Appropriate labeling is also applied for identification and traceability. This ensures product integrity during storage, handling and transportation.


ESD

Certifications & Memberships

Third-party certified, strict quality control. Our certification
  • ISO 9001: 2015
  • ISO 13485: 2016
  • ISO 14001: 2015
  • ISO 28000: 2007
  • ISO 45001: 2018
  • GB/T 27922-2011
  • SMTA
  • IPC
  • ESD
  • PSMA
ATMEGA168PA-AN Image

ATMEGA168PA-AN

Microchip Technology
32D-ATMEGA168PA-AN

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