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HomeProductsIntegrated Circuits (ICs)Embedded - MicrocontrollersATMEGA16L-8AI
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ATMEGA16L-8AI - Microchip Technology

Manufacturer Part Number
ATMEGA16L-8AI
Manufacturer
Microchip Technology
Allelco Part Number
32D-ATMEGA16L-8AI
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
16,990 pcs available, New & Original
Parts Description
IC MCU 8BIT 16KB FLASH 44TQFP
Package
44-TQFP (10x10)
Data sheet
ATMEGA16L-8AI.pdf
RoHs Status
 
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In stock: 16990

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Specifications

ATMEGA16L-8AI Tech Specifications
Microchip Technology - ATMEGA16L-8AI technical specifications, attributes, parameters and parts with similar specifications to Microchip Technology - ATMEGA16L-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 1K x 8
Program Memory Type FLASH
Program Memory Size 16KB (8K 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 ATMEGA16

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

ATMEGA16L-8AI Image
ATMEGA16L-8AI (1)

Manufacturer Part Number

ATMEGA16L-8AI

Manufacturer

microchip-technology

Introduction

The ATMEGA16L-8AI is a low-power CMOS 8-bit microcontroller based on the AVR enhanced RISC architecture by Microchip Technology.

Product Features and Performance

8-bit AVR Core Processor

16KB Flash Program Memory

512B EEPROM

1KB RAM

Operates up to 8MHz

Internal Oscillator

Comprehensive connectivity with I2C, SPI, and UART/USART interfaces

Integrated Peripherals: Brown-out Detect/Reset, Power-on Reset (POR), Pulse Width Modulation (PWM), Watchdog Timer (WDT)

32 Programmable I/O Lines

A/D Converter with 8 channels and 10-bit resolution

Product Advantages

Low power consumption suitable for battery-operated applications

Rich set of peripherals enabling versatile application development

Large program memory for complex software applications

High integration level reduces external component count

Key Technical Parameters

Core Size: 8-Bit

Speed: 8MHz

Voltage Supply (Vcc/Vdd): 2.7V ~ 5.5V

Operating Temperature: -40°C ~ 85°C (TA)

Package / Case: 44-TQFP

Quality and Safety Features

Brown-out detection for system reliability

Power-on Reset (POR) ensures the proper start-up of microcontroller

Watchdog Timer (WDT) prevents system hang-up

Compatibility

Can interface with other I2C, SPI, and UART/USART devices

Compatible with a wide range of sensors and actuators due to versatile I/O options

Application Areas

Embedded systems

Automation

Consumer Electronics

IoT devices

Automotive

Product Lifecycle

Obsolete; consideration for future designs should include looking for replacements or upgrades.

Several Key Reasons to Choose This Product

High integration facilitates compact and efficient design.

Low power consumption extends battery life in portable applications.

Comprehensive connectivity options expand application potential.

16KB of programming memory supports complex algorithms and software functions.

Robust set of peripherals enhances functionality without needing many external components.

Frequently Asked Questions(FAQ)

What is the typical current consumption of the ATMEGA16L-8AI in active mode at 5V and 1MHz, and how does this compare to its power-saving modes for battery-operated designs?
The ATMEGA16L-8AI typically draws around 7.0 mA in active mode at Vcc = 5V and 1 MHz operation, with the full 8 MHz speed increasing this to approximately 9.0–12.0 mA depending on peripheral usage. In power-down mode, current drops to about 0.1 µA, while idle mode consumes roughly 1.0 mA at 1 MHz. This significant difference makes low-power modes essential for extending battery life in portable applications such as sensor nodes or remote monitoring systems.
How should I configure the internal oscillator and clock prescaler when using the ATMEGA16L-8AI in a system requiring precise timing but without an external crystal?
When relying solely on the internal RC oscillator of the ATMEGA16L-8AI, ensure that CKSEL fuses are set to select the internal 8 MHz calibration (typically CKSEL3:0 = 0010 or similar per calibration data). Due to ±10% frequency variation across temperature and voltage, apply software compensation in time-critical tasks. Use the CLKPR register to divide the clock down (e.g., /1, /2, /4) as needed, balancing responsiveness with power efficiency. Always verify startup stability with an oscilloscope if possible, especially after programming.
Can the ATMEGA16L-8AI reliably operate at 3.3V logic levels while interfacing with 5V peripherals, and what precautions must be taken regarding I/O pin thresholds?
Yes, the ATMEGA16L-8AI supports 2.7V to 5.5V operation, so it can run at 3.3V and communicate safely with 5V devices. However, input high threshold voltages (VIH) rise above 2.7V, meaning some 3.3V signals may not meet VIH at lower supply voltages. To avoid undefined states, either use level shifters or ensure all communication uses open-drain/open-collector topologies like I²C with pull-ups rated for mixed supplies. Avoid directly connecting 5V outputs to TTL-compatible inputs unless Vdd exceeds 3.3V.
What are the key differences between the ATMEGA16L-8AI and the ATMEGA16L-8AU in terms of packaging, availability, and long-term design stability?
The primary distinction lies in packaging: the ATMEGA16L-8AI uses lead-free (RoHS compliant) TQFP-44 (10x10), whereas the ATMEGA16L-8AU uses a traditional plastic QFN-44 with different pinout orientation. Both share identical electrical characteristics. For new designs targeting industrial or medical applications, prefer the ATMEGA16L-8AI due to better thermal performance in surface-mount assembly. Note that both parts are now considered end-of-life; consider migration paths early in product development.
Is it safe to access the EEPROM memory during normal program execution on the ATMEGA16L-8AI, and what latency should be expected for write cycles?
Yes, the ATMEGA16L-8AI allows concurrent execution and EEPROM access. Reads complete in a single cycle, while writes require approximately 3.3 ms worst-case (at minimum Vcc) to complete. Each byte has a rated endurance of 100k cycles, with data retention up to 20 years under typical conditions. To minimize wear, batch small writes into larger blocks and avoid frequent updates. Always check the fuse settings—EEPROM write enable is controlled by WDTON and EESAVE fuses, which may affect retention if altered.
How does the ADC in the ATMEGA16L-8AI perform in noisy environments, and what steps improve accuracy when sampling analog signals near digital switching circuits?
The ATMEGA16L-8AI’s 10-bit ADC achieves ~±2 LSB integral nonlinearity under ideal conditions but degrades in electrically noisy layouts. Noise from fast digital transitions couples through ground planes and power rails. Mitigation includes adding decoupling capacitors (100nF + 10µF) close to Vcc, using differential or single-ended inputs with proper reference selection (internal 2.56V vs external precision source), enabling the ADC prescaler to reduce sampling rate and allow settling, and applying oversampling or averaging in firmware. Shielding analog traces and separating analog/digital grounds with a star point minimizes interference.
What happens if the supply voltage to the ATMEGA16L-8AI drops below 2.7V, and how does its brown-out detection feature protect against undervoltage conditions?
If Vcc falls below 2.7V during operation, the ATMEGA16L-8AI may execute corrupted instructions or reset unpredictably. Its built-in brown-out detection (BOD) monitors Vcc and triggers a reset if voltage drops below a selectable threshold—commonly 2.7V, 4.3V, or user-defined via fuse bits. During reset, code execution halts until Vcc recovers above the threshold, preventing erratic behavior in unstable power scenarios. Ensure BOD is enabled during boot and test under simulated brown-out conditions during validation.
How much stack space should I allocate in RAM when developing firmware for the ATMEGA16L-8AI, and why is this important for interrupt-driven designs?
With only 1KB of SRAM, careful memory planning is critical. Reserve at least 64–128 bytes for the call stack, especially in nested interrupts or recursive functions. Interrupt service routines consume stack space on entry/exit, and UART or timer interrupts often trigger frequently. Monitor stack usage with tools like avr-size or custom assertions—overflow causes silent corruption or crashes. Keep ISRs short and defer processing to main loop tasks. Avoid dynamic allocation; use static buffers instead.
Can the ATMEGA16L-8AI drive inductive loads directly, and what protection circuitry must be added when controlling relays or solenoids?
No, the ATMEGA16L-8AI cannot source enough current (max 40mA per pin, 200mA total) to drive most inductive loads directly. Use a transistor or MOSFET driver stage. Add flyback diodes across inductive loads to suppress back EMF, which can exceed the MCU’s absolute maximum ratings and cause latch-up or damage. For higher currents, consider optoisolators to break ground loops and provide galvanic isolation. Always respect the 32 I/O limit and distribute load current across multiple pins if necessary.
Why might the ATMEGA16L-8AI fail to start after programming, even though the fuse bits appear correct, and what are common causes related to clock configuration?
Startup failure often stems from incorrect clock source selection in CKSEL fuses conflicting with hardware setup. If external crystal wiring is incomplete or absent but fuses expect it, the chip remains in reset. Similarly, setting SUT1:0 too low (e.g., 00 for slow rising power) without adequate bypass caps delays oscillator stabilization. Verify fuse settings match physical components: if using internal RC, confirm no external crystal is attached. Also check that RESET pin isn’t pulled high unintentionally. Use an in-circuit debugger to monitor clock status registers during boot.

Parts with Similar Specifications

The three parts on the right have similar specifications to Microchip Technology ATMEGA16L-8AI

Product Attribute ATMEGA16L-8AUR ATMEGA16L-8AQ ATMEGA16L-8AC ATMEGA16L-8AU
Part Number ATMEGA16L-8AUR ATMEGA16L-8AQ ATMEGA16L-8AC ATMEGA16L-8AU
Manufacturer Atmel Atmel Microchip Technology Microchip Technology
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Program Memory Size - - - -
Program Memory Type - - - -
Core Processor - - - -
Core Size - - - -
RAM Size - - - -
Voltage - Supply (Vcc/Vdd) - - - -
Connectivity - - - -
Data Converters - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Peripherals - - - -
Number of I/O - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Oscillator Type - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Series - - - -
EEPROM Size - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Speed - - - -

ATMEGA16L-8AI Datasheet PDF

Download ATMEGA16L-8AI pdf datasheets and Microchip Technology documentation for ATMEGA16L-8AI - Microchip Technology.

Datasheets
ATMEGA16(L) Datasheet.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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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

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(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.
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Electrostatic Discharge Protection and Handling

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ATMEGA16L-8AI Image

ATMEGA16L-8AI

Microchip Technology
32D-ATMEGA16L-8AI

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