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ATMEGA16A-AU
Microchip Technology
IC MCU 8BIT 16KB FLASH 44TQFP
32370 Pcs New Original In Stock
AVR AVR® ATmega Microcontroller IC 8-Bit 16MHz 16KB (8K x 16) FLASH 44-TQFP (10x10)
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5.0 / 5.0
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ATMEGA16A-AU
Product Overview
1295204
DiGi Electronics Part Number
ATMEGA16A-AU-DGManufacturer
Microchip Technology
ATMEGA16A-AU
Description
IC MCU 8BIT 16KB FLASH 44TQFPInventory
32370 Pcs New Original In Stock
AVR AVR® ATmega Microcontroller IC 8-Bit 16MHz 16KB (8K x 16) FLASH 44-TQFP (10x10)
CAD Models - PCB Symbols & Footprints
Quantity
Minimum 1
Minimum 1
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ATMEGA16A-AU Technical Specifications
Category
Embedded, Microcontrollers
Packaging
Tray
Series
AVR® ATmega
Product Status
Active
DiGi-Electronics Programmable
Verified
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
I2C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number of I/O
32
Program Memory Size
16KB (8K x 16)
Program Memory Type
FLASH
EEPROM Size
512 x 8
RAM Size
1K x 8
Voltage - Supply (Vcc/Vdd)
2.7V ~ 5.5V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C (TA)
Mounting Type
Surface Mount
Supplier Device Package
44-TQFP (10x10)
Package / Case
44-TQFP
Base Product Number
ATMEGA16
Datasheet & Documents
HTML Datasheet
ATMEGA16A-AU-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
3 (168 Hours)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.31.0001
Additional Information
Other Names
ATMEGA16AAU
Standard Package
160
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
問題があった際の対応もスピーディで、非常に頼りになりました。
Dec 02, 2025
The company's swift shipping processes significantly reduce downtime for projects.
Dec 02, 2025
Their after-sales service is top-notch, addressing any issues promptly.
Dec 02, 2025
I’m always pleased with the experience at DiGi Electronics.
Dec 02, 2025
DiGi Electronics always delivers on time and with excellent support.
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Frequently Asked Questions (FAQ)
What are the key design risks when replacing an ATMEGA16A-AU with a lower-cost 8-bit microcontroller like the PIC18F4520-I/P in a battery-powered sensor node?
Replacing the ATMEGA16A-AU with a PIC18F4520-I/P introduces several engineering risks: the PIC18F4520 requires a higher minimum operating voltage (4.2V vs. 2.7V for the ATMEGA16A-AU), which reduces usable battery life in low-voltage scenarios. Additionally, the PIC18F4520 lacks built-in brown-out detection with programmable thresholds, increasing susceptibility to erratic behavior during power dips. The ATMEGA16A-AU’s internal oscillator is factory-calibrated and more stable over temperature, whereas the PIC18F4520 often requires an external crystal for reliable UART timing, adding BOM cost and board space. If your design relies on sleep modes below 3V or tight timing without external components, the ATMEGA16A-AU remains the safer choice despite higher unit cost.
Can the ATMEGA16A-AU safely drive 32 LEDs directly from its I/O pins in a multiplexed display without external drivers?
No, the ATMEGA16A-AU should not directly drive 32 LEDs, even in a multiplexed configuration. Each I/O pin is rated for a maximum of 40mA absolute maximum current, but the total port current per Vcc/GND pair must not exceed 200mA. Driving multiple LEDs simultaneously—even briefly during multiplexing—can easily exceed these limits and cause overheating or permanent damage. Instead, use the ATMEGA16A-AU’s I/O pins to control external constant-current LED drivers (e.g., TLC5916 or ULN2003) or MOSFETs. This preserves reliability, improves brightness consistency, and protects the microcontroller from current-induced stress, especially in high-duty-cycle applications.
Is it safe to operate the ATMEGA16A-AU at 16MHz with a 3.3V supply in an industrial environment with temperature swings from -20°C to 70°C?
Operating the ATMEGA16A-AU at 16MHz with a 3.3V supply is within the datasheet’s specified range (2.7V–5.5V), but marginal timing margins at the lower end of the voltage range can cause intermittent failures under temperature stress. At -20°C, internal propagation delays increase, and at 3.3V, the noise margin for high-speed digital signals shrinks. For industrial reliability, consider reducing the clock to 8MHz or using an external 3.3V-regulated supply with tight tolerance (±2%) and decoupling capacitors near each power pin. Alternatively, switch to the ATMEGA16L variant, which is rated for 8MHz max at 2.7V–5.5V and offers more robust low-voltage operation, though it sacrifices speed.
How does the ATMEGA16A-AU compare to the newer ATMEGA328P-AU for a legacy industrial control board redesign aiming to reduce long-term supply risk?
While the ATMEGA328P-AU offers double the flash (32KB vs. 16KB) and is widely used in Arduino ecosystems, it is not a drop-in replacement for the ATMEGA16A-AU due to pinout and peripheral differences. The ATMEGA328P-AU has a different pin arrangement in the 44-TQFP package, requiring PCB layout changes. Additionally, the watchdog timer and ADC reference circuitry differ slightly, which may affect firmware compatibility. However, the ATMEGA328P-AU benefits from broader long-term availability and lower cost. If your application can accommodate firmware updates and layout changes, migrating improves supply chain resilience. Otherwise, sticking with the ATMEGA16A-AU and securing volume agreements with Microchip is safer for drop-in continuity.
What precautions are needed when programming the ATMEGA16A-AU in a high-noise automotive environment with frequent power cycling?
In high-noise, power-cycling environments, the ATMEGA16A-AU requires robust power integrity and programming safeguards. Always use a decoupling capacitor (100nF ceramic) within 5mm of each Vcc pin and add a bulk capacitor (10µF) near the power entry point to mitigate voltage dips during cranking or load dumps. Enable the brown-out detection (BOD) at 2.7V or 4.3V (depending on supply) to prevent execution from corrupted flash during brownouts. During in-system programming (ISP), isolate the SPI lines with series resistors (100–330Ω) to reduce noise coupling. Avoid programming during power transients, and consider using a watchdog timer in your bootloader to reset the ATMEGA16A-AU if programming hangs due to EMI. These steps prevent latch-up, flash corruption, and intermittent failures in harsh conditions.
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DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
ATMEGA16A-AU CAD Models
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