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AT90PWM81-16MN
Microchip Technology
IC MCU 8BIT 8KB FLASH 32VQFN
16486 Pcs New Original In Stock
AVR AVR® 90PWM Lighting Microcontroller IC 8-Bit 16MHz 8KB (8K x 8) FLASH 32-VQFN (5x5)
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5.0 / 5.0
- (483 Ratings)
AT90PWM81-16MN
Product Overview
1261402
DiGi Electronics Part Number
AT90PWM81-16MN-DGManufacturer
Microchip Technology
AT90PWM81-16MN
Description
IC MCU 8BIT 8KB FLASH 32VQFNInventory
16486 Pcs New Original In Stock
AVR AVR® 90PWM Lighting Microcontroller IC 8-Bit 16MHz 8KB (8K x 8) FLASH 32-VQFN (5x5)
Quantity
Minimum 1
Minimum 1
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AT90PWM81-16MN Technical Specifications
Category
Embedded, Microcontrollers
Packaging
Tray
Series
AVR® 90PWM Lighting
Product Status
Active
DiGi-Electronics Programmable
Not Verified
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
SPI
Peripherals
Brown-out Detect/Reset, PWM, WDT
Number of I/O
20
Program Memory Size
8KB (8K x 8)
Program Memory Type
FLASH
EEPROM Size
512 x 8
RAM Size
256 x 8
Voltage - Supply (Vcc/Vdd)
2.7V ~ 5.5V
Data Converters
A/D 11x10b; D/A 1x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 105°C (TA)
Mounting Type
Surface Mount
Supplier Device Package
32-VQFN (5x5)
Package / Case
32-VFQFN Exposed Pad
Base Product Number
AT90PWM81
Datasheet & Documents
HTML Datasheet
AT90PWM81-16MN-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
AT90PWM8116MN
1611-AT90PWM81-16MN
Standard Package
490
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
비교적 저렴한 가격에 뛰어난 서비스까지, 평소에도 꾸준히 추천하고 싶은 곳입니다.
Dec 02, 2025
Une entreprise qui respecte ses délais d’expédition et qui offre un support après-vente remarquable.
Dec 02, 2025
Rapid shipping and long-lasting quality—nothing more I could ask for from a supplier.
Dec 02, 2025
Their packaging integrity is maintained even for international shipments, which is impressive.
Dec 02, 2025
Customer-focused packaging solutions make each purchase feel special.
Dec 02, 2025
The cost savings we've achieved are substantial thanks to their pricing advantages.
Dec 02, 2025
DiGi Electronics' prompt delivery has consistently met my urgent needs, making them a reliable vendor.
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Frequently Asked Questions (FAQ)
Can the AT90PWM81-16MN be used as a drop-in replacement for the AT90PWM3B-8MN in a legacy lighting ballast design, and what firmware or pinout adjustments are needed?
The AT90PWM81-16MN is not a direct drop-in replacement for the AT90PWM3B-8MN due to differences in pinout, memory architecture, and peripheral mapping. While both are 8-bit AVR microcontrollers with PWM capabilities for lighting applications, the AT90PWM81-16MN uses a 32-VQFN package with an exposed pad, whereas the AT90PWM3B-8MN comes in a 28-pin DIP or SOIC. Additionally, the AT90PWM81-16MN has 8KB Flash vs. 8KB on the PWM3B, but different register layouts and timer/PWM block configurations require firmware revalidation. You’ll need to remap I/O pins, update clock initialization (internal oscillator vs. external crystal dependencies), and verify analog comparator and D/A converter usage. Always re-run EMI and thermal validation after substitution.
What are the key reliability risks when operating the AT90PWM81-16MN at 5.5V and 105°C in an industrial LED driver, and how can they be mitigated?
Operating the AT90PWM81-16MN at its absolute maximum ratings—5.5V Vcc and 105°C ambient—increases risk of accelerated electromigration, reduced Flash endurance, and potential timing drift in the internal oscillator. The datasheet specifies Flash write/erase cycles as 10,000 typical, but high-temperature operation can degrade this. To mitigate, derate the supply voltage to ≤5.0V if possible, ensure robust PCB thermal management (especially for the exposed pad), and avoid frequent Flash writes during runtime—use EEPROM (512 bytes available) for configuration storage instead. Also, enable the Brown-out Detect (BOD) at 4.3V or higher to prevent erratic behavior during voltage sags.
How does the AT90PWM81-16MN compare to the newer ATtiny817-XPRO for PWM-intensive lighting control, and when should I stick with the older AT90PWM81-16MN?
The ATtiny817-XPRO offers higher integration (12-bit DAC, event system, CCL logic) and better power efficiency, but the AT90PWM81-16MN remains preferable in cost-sensitive, legacy-compatible designs requiring precise analog feedback loops. The AT90PWM81-16MN includes a dedicated 10-bit D/A converter and 11-channel 10-bit ADC optimized for current-mode LED control, which the ATtiny817 lacks. If your design relies on tight analog signal conditioning or you're maintaining firmware compatibility with existing AVR90PWM codebase, the AT90PWM81-16MN is still viable. However, for new designs needing lower BOM cost and advanced peripherals, migrate to ATtiny817—but expect significant firmware rework.
What layout and grounding practices are critical when designing a 2-layer PCB with the AT90PWM81-16MN to avoid noise coupling into the 10-bit ADC channels?
On a 2-layer board, proper grounding and signal routing are essential to preserve ADC accuracy on the AT90PWM81-16MN. Connect the exposed thermal pad directly to a solid ground plane with multiple vias to minimize ground impedance. Keep analog traces (e.g., ADC inputs) short, away from PWM outputs and digital signal lines, and use guard rings tied to ground if space allows. Power the AREF pin with a clean, filtered supply (e.g., LC filter from Vcc) and avoid routing high-current return paths under analog sections. Also, place decoupling capacitors (100nF ceramic + 1–10µF tantalum) as close as possible to Vcc pins. Without these measures, switching noise from internal PWMs can induce >5 LSB errors in 10-bit conversions.
Is it safe to disable the internal oscillator of the AT90PWM81-16MN and rely solely on an external 16MHz crystal in a high-vibration automotive lighting environment?
While the AT90PWM81-16MN supports external crystals up to 16MHz, using one in high-vibration environments (e.g., automotive under-hood lighting) introduces startup and reliability risks. Mechanical stress can cause crystal fracture or frequency instability, leading to MCU lockup. If you must use an external crystal, select a ruggedized, automotive-qualified SMD crystal (e.g., ECS-160-12-30B-CKM) and ensure proper load capacitance matching. However, for vibration-prone applications, it’s safer to use the internal 8MHz RC oscillator (calibrated to ±1% at 3V, 25°C) and PLL to reach 16MHz—this avoids crystal fragility altogether. Always validate startup time and clock stability across the full temperature range (-40°C to 105°C) during qualification testing.
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AT90PWM81-16MN CAD Models
Microchip Technology AT90PWM81-16MN PCB symbols & footprints
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