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HomeProductsIntegrated Circuits (ICs)Embedded - MicrocontrollersATMEGA324PA-AUR
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ATMEGA324PA-AUR - Microchip Technology

Manufacturer Part Number
ATMEGA324PA-AUR
Manufacturer
Microchip Technology
Allelco Part Number
32D-ATMEGA324PA-AUR
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
9,995 pcs available, New & Original
Parts Description
IC MCU 8BIT 32KB FLASH 44TQFP
Package
44-TQFP (10x10)
Data sheet
ATMEGA324PA-AUR.pdf

PCN Assembly/Origin

2.73KHz.pdf
RoHs Status
ROHS3 Compliant
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In stock: 9995

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Specifications

ATMEGA324PA-AUR Tech Specifications
Microchip Technology - ATMEGA324PA-AUR technical specifications, attributes, parameters and parts with similar specifications to Microchip Technology - ATMEGA324PA-AUR

Product Attribute Attribute Value
Manufacturer Microchip Technology
Voltage - Supply (Vcc/Vdd) 1.8V ~ 5.5V
Supplier Device Package 44-TQFP (10x10)
Speed 20MHz
Series AVR® ATmega
RAM Size 2K x 8
Program Memory Type FLASH
Program Memory Size 32KB (16K x 16)
Peripherals Brown-out Detect/Reset, POR, PWM, WDT
Package / Case 44-TQFP
Package Tape & Reel (TR)
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 1K x 8
Data Converters A/D 8x10b
Core Size 8-Bit
Core Processor AVR
Connectivity I²C, SPI, UART/USART
Base Product Number ATMEGA324

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

ATMEGA324PA-AUR Image
ATMEGA324PA-AUR (1)

Manufacturer Part Number

ATMEGA324PA-AUR

Manufacturer

Microchip Technology

Introduction

The ATMEGA324PA-AUR is a high-performance, low-power 8-bit AVR RISC-based microcontroller from Microchip Technology. It combines 32KB of in-system self-programmable flash program memory, 2KB of SRAM, and 1KB of EEPROM.

Product Features and Performance

32KB of in-system self-programmable flash program memory

2KB of SRAM

1KB of EEPROM

8-bit AVR RISC-based CPU

20MHz maximum operating speed

8x10-bit ADC

32 programmable I/O lines

Serial communication interfaces (UART, SPI, I2C)

Peripheral features include brown-out detection, internal oscillator, and watchdog timer

Product Advantages

High-performance, low-power 8-bit AVR microcontroller

Wide operating voltage range (1.8V to 5.5V)

In-system programmable flash

Power-on reset and brown-out detection

Rich peripheral set for versatile applications

Key Technical Parameters

Manufacturer Part Number: ATMEGA324PA-AUR

Package: 44-TQFP (10x10)

Operating Temperature: -40°C to 85°C

Supply Voltage: 1.8V to 5.5V

Flash Program Memory: 32KB

SRAM: 2KB

EEPROM: 1KB

Oscillator: Internal

Maximum Operating Speed: 20MHz

Quality and Safety Features

RoHS3 Compliant

Brown-out detection and reset

Power-on reset

Compatibility

The ATMEGA324PA-AUR is compatible with the AVR ATmega series of microcontrollers and can be used in a wide range of embedded applications.

Application Areas

Industrial control systems

Automotive electronics

Home automation

Medical devices

IoT applications

Robotics

Portable devices

Product Lifecycle

The ATMEGA324PA-AUR is an active product and is not nearing discontinuation. Microchip Technology continues to offer this and other AVR microcontroller products with regular updates and improvements.

Key Reasons to Choose This Product

High-performance, low-power 8-bit AVR microcontroller

Extensive on-chip peripherals and features for versatile applications

Wide operating voltage range and in-system programmable flash

Excellent compatibility with the AVR ATmega series

Reliable and long-lasting product from a trusted manufacturer, Microchip Technology

Frequently Asked Questions(FAQ)

How does the ATMEGA324PA-AUR compare to other 8-bit AVR microcontrollers in terms of program memory size and I/O availability for industrial sensor monitoring applications?
The ATMEGA324PA-AUR offers 32KB of flash program memory and 32 programmable I/O pins, which provides sufficient code space and interface flexibility for complex sensor networks. When compared to smaller variants like the ATMEGA164P, it doubles the program memory while maintaining the same pin count, enabling more sophisticated data processing algorithms without requiring external memory. However, larger models such as the ATMEGA1284P offer 128KB flash but at higher pin counts and cost, making the ATMEGA324PA-AUR a balanced choice for mid-range embedded systems where power efficiency and peripheral integration are prioritized.
What considerations should be made when selecting the ATMEGA324PA-AUR for battery-powered devices operating below 3V?
The ATMEGA324PA-AUR operates reliably down to 1.8V, making it suitable for low-voltage applications such as portable instrumentation or remote sensing nodes. At 1.8V, clock speeds must be reduced from the rated 20MHz maximum to maintain stability—typically limited to around 7–8MHz—which may impact real-time response. Additionally, internal oscillator accuracy degrades with lower supply voltage, potentially affecting timing-critical operations like UART baud rate generation or ADC sampling intervals. Careful assessment of duty cycle, sleep mode utilization, and wake-up latency is essential to optimize battery life without compromising functionality.
Can the ATMEGA324PA-AUR support both internal and external clock sources simultaneously during system initialization?
No, the ATMEGA324PA-AUR cannot run both internal and external oscillators concurrently in normal operation. During startup, the device defaults to the internal RC oscillator unless configured otherwise by fuse settings. Once booted, switching between clock sources requires disabling one before enabling the other, typically through software control of the CLKPR (Clock Prescaler) and CKSEL fuses. For designs requiring precise timing (e.g., USB communication), an external crystal or resonator should be selected via fuse programming; attempting to bypass this may result in failed programming or unstable execution due to incorrect fuse configuration.
In what scenarios would the ATMEGA324PA-AUR’s built-in 8-channel 10-bit ADC be insufficient, and how might that affect system design?
While the ATMEGA324PA-AUR includes eight 10-bit successive approximation ADCs, its resolution and sampling rate may limit performance in high-precision measurement systems. For example, in medical or scientific instrumentation requiring better than 10-bit effective resolution, external delta-sigma ADCs are preferable. Similarly, if multiple sensors need simultaneous sampling, the shared SAR architecture means only one channel can sample at full speed at a time. Designers working with thermal arrays or multi-axis accelerometers often add external multiplexers and dedicated ADCs to overcome these limitations, increasing component count but improving measurement integrity.
How does the ATMEGA324PA-AUR handle brownout detection and reset during rapid voltage transients common in automotive environments?
The ATMEGA324PA-AUR features configurable brownout detection (BOD) that monitors Vcc and triggers a reset if the voltage drops below a user-defined threshold—typically selectable at 2.7V, 4.3V, or disabled. This helps prevent erratic behavior during brownouts but has response latency on the order of microseconds. In harsh automotive environments with fast load dumps or cold-crank conditions, additional external voltage supervisors (such as the MAX809) are recommended to provide faster fault response and protect the MCU from latchup. The internal watchdog timer (WDT) also assists in recovery from soft lockups but cannot compensate for sustained undervoltage events.
Is it advisable to use the ATMEGA324PA-AUR in applications requiring over 32KB of firmware storage?
No, the ATMEGA324PA-AUR contains exactly 32KB of flash memory, which limits firmware complexity and data logging capacity. If future expansion is anticipated, designers should consider migrating to a larger variant like the ATMEGA1284PA-AUR, which offers 128KB flash while retaining compatibility in the same package. Alternatively, external serial EEPROMs (e.g., 24LC256) can supplement non-volatile storage for calibration data or logs, though they lack execute capability and increase bus contention risks. Evaluating whether current code fits within 32KB using tools like avr-size is critical before finalizing part selection.
What are the implications of using the internal oscillator versus an external crystal on the ATMEGA324PA-AUR in precision timing applications?
The ATMEGA324PA-AUR’s internal 8MHz RC oscillator (±10% tolerance) lacks the stability needed for accurate baud rates over temperature or long durations. For UART communications requiring consistent bit timing, especially at high speeds (e.g., 115200 bps), an external 16MHz crystal provides better frequency accuracy (<±50ppm). Using the internal oscillator may lead to framing errors or data corruption in noisy environments or when interfacing with strict protocol standards like CAN or RS-485. Fuse settings must explicitly enable the external crystal mode, and PCB layout must ensure minimal trace length and proper load capacitors to maintain oscillation reliability.
How does the ATMEGA324PA-AUR’s package affect thermal performance in compact handheld devices?
The 44-pin TQFP (10x10mm) package has moderate thermal resistance, limiting heat dissipation under continuous high-load operation. In compact handheld devices with limited airflow, sustained CPU usage above 70% can cause local heating near the IC, potentially triggering thermal protection or throttling behavior indirectly via clock scaling or WDT resets. Thermal vias under the package and strategic ground plane routing improve conduction to adjacent layers, but designers must monitor worst-case power consumption—especially from peripherals like PWM-driven LEDs or high-speed SPI interfaces—to avoid exceeding junction temperature limits (-40°C to +85°C).
Can the ATMEGA324PA-AUR drive capacitive loads directly from its GPIO pins, and what are the risks?
The ATMEGA324PA-AUR can source/sink up to 40mA per I/O pin, but driving large capacitive loads (e.g., unterminated LCD segments or long PCB traces) risks excessive inrush current and potential latchup. Each pin has limited ESD protection (~2kV HBM), and repeated charge/discharge cycles degrade metal interconnect integrity over time. For capacitive loads exceeding 50pF, external drivers (e.g., 74HC04 buffers) or series resistors (100Ω–1kΩ) are advised to limit dI/dt and reduce electromagnetic interference. Software-controlled slew-rate adjustment via PORT register writes can further mitigate ringing in high-speed switching scenarios.
What role does the ATMEGA324PA-AUR’s USART module play in industrial communication protocols?
The integrated UART/USART supports full-duplex asynchronous communication at up to 2Mbps (with external crystal), enabling reliable interfacing with PROFIBUS, Modbus RTU, or custom serial protocols over RS-485 or optical links. Its hardware flow control (CTS/RTS) prevents buffer overflows in noisy environments, while automatic baud rate detection simplifies firmware development. However, achieving deterministic timing requires careful consideration of stop bits, parity, and interrupt latency—factors that vary between protocol implementations. Designs using Manchester encoding or bit-banged protocols may still require tighter timing margins than those achievable with the internal oscillator alone.
Why might a developer choose the ATMEGA324PA-AUR over ARM-based MCUs despite lower computational throughput?
The ATMEGA324PA-AUR offers significant advantages in ultra-low-power modes (down to 1.5µA in power-down with WDT), deterministic interrupt response, and rich analog peripherals (10-bit ADC, op-amp emulation), making it ideal for battery-operated or always-on sensor nodes. ARM Cortex-M0+ parts offer higher performance but consume more active and standby power, complicating energy harvesting designs. Additionally, the ATmega family’s mature toolchain (AVR-GCC, Atmel Studio), extensive library support, and proven reliability in legacy industrial systems make it a pragmatic choice where simplicity, cost, and power profile outweigh raw speed requirements.
How should decoupling capacitors be sized and placed when using the ATMEGA324PA-AUR in mixed-signal circuits?
Each Vcc/Vss pair on the ATMEGA324PA-AUR should have a 100nF ceramic capacitor placed within 5mm of the pin, supplemented by a bulk 10µF tantalum or ceramic across the entire board near the power entry point. High-frequency noise from digital switching couples into analog sections like the ADC reference, degrading SNR by 1–3dB if not suppressed. Use separate analog and digital ground planes connected at a single star point to prevent return current paths from contaminating sensitive signals. Ferrite beads on analog supplies can further isolate broadband noise, though they introduce DC resistance that must be compensated in low-dropout regulator designs.

Parts with Similar Specifications

The three parts on the right have similar specifications to Microchip Technology ATMEGA324PA-AUR

Product Attribute ATMEGA324PA-AU ATMEGA324PA-CUR ATMEGA324PA-CUR ATMEGA324PA-CU
Part Number ATMEGA324PA-AU ATMEGA324PA-CUR ATMEGA324PA-CUR ATMEGA324PA-CU
Manufacturer Microchip Technology Atmel Microchip Technology Microchip Technology
Peripherals - - - -
Program Memory Type - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Core Size - - - -
Connectivity - - - -
EEPROM Size - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Voltage - Supply (Vcc/Vdd) - - - -
Core Processor - - - -
Program Memory Size - - - -
Oscillator Type - - - -
Series - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Data Converters - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Number of I/O - - - -
Speed - - - -
RAM Size - - - -
Mounting Type - Surface Mount Through Hole Surface Mount

ATMEGA324PA-AUR Datasheet PDF

Download ATMEGA324PA-AUR pdf datasheets and Microchip Technology documentation for ATMEGA324PA-AUR - Microchip Technology.

Datasheets
Cylindrical Battery Holders.pdf
PCN Design/Specification
ATmega164A/PA/324A/PA/644A/PA/1284/P 20/Jan/2020.pdf ATmega324P/V 05/Apr/2018.pdf
PCN Assembly/Origin
2.73KHz.pdf
PCN Packaging
Tape and Reel Label Update 10/Feb/2015.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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Note:
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ATMEGA324PA-AUR Image

ATMEGA324PA-AUR

Microchip Technology
32D-ATMEGA324PA-AUR

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