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AT32F421K8U7
ARTERY
IC MCU 32BIT 64KB FLASH 32QFN
14827 Pcs New Original In Stock
ARM® Cortex®-M4 Han® 1A Microcontroller IC 32-Bit 120MHz 64KB (64K x 8) FLASH 32-QFN (5x5)
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Minimum 1
5.0 / 5.0
- (181 Ratings)
AT32F421K8U7
Product Overview
2291115
DiGi Electronics Part Number
AT32F421K8U7-DGManufacturer
ARTERY
AT32F421K8U7
Description
IC MCU 32BIT 64KB FLASH 32QFNInventory
14827 Pcs New Original In Stock
ARM® Cortex®-M4 Han® 1A Microcontroller IC 32-Bit 120MHz 64KB (64K x 8) FLASH 32-QFN (5x5)
Quantity
Minimum 1
Minimum 1
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AT32F421K8U7 Technical Specifications
Category
Embedded, Microcontrollers
Packaging
Tray
Series
Han® 1A
Product Status
Active
Core Processor
ARM® Cortex®-M4
Core Size
32-Bit
Speed
120MHz
Connectivity
I2C, IrDA, LINbus, SMBus, SPI, UART/USART
Peripherals
DMA, I2S, IR, LVR, POR, PWM, WDT
Number of I/O
27
Program Memory Size
64KB (64K x 8)
Program Memory Type
FLASH
EEPROM Size
-
RAM Size
16K x 8
Voltage - Supply (Vcc/Vdd)
2.4V ~ 3.6V
Data Converters
A/D 11x12b SAR
Oscillator Type
External, Internal
Operating Temperature
-40°C ~ 105°C (TA)
Mounting Type
Surface Mount
Supplier Device Package
32-QFN (5x5)
Package / Case
32-WFQFN Exposed Pad
Datasheet & Documents
HTML Datasheet
AT32F421K8U7-DG
Environmental & Export Classification
RoHS Status
RoHS Compliant
Moisture Sensitivity Level (MSL)
3 (168 Hours)
REACH Status
REACH Unaffected
ECCN
3A991A2
HTSUS
8542.39.0022
Additional Information
Other Names
5216-AT32F421K8U7
Standard Package
1
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
디지 일렉트로닉스는 가격도 부담 없고, 서비스도 꼼꼼하게 챙겨주셔서 좋아요.
Dec 02, 2025
Leur service client après-vente est remarquable pour sa promptitude.
Dec 02, 2025
価値ある価格設定と迅速な対応に満足しています。
Dec 02, 2025
The speed of their delivery service is unmatched in the electronics hobbyist community.
Dec 02, 2025
We appreciate the extensive product diversity, which enables us to cater to different departments and age groups effectively.
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Frequently Asked Questions (FAQ)
What are the key design risks when integrating the AT32F421K8U7 into a power-constrained industrial sensor node, and how can they be mitigated?
When integrating the AT32F421K8U7 into a power-constrained system, a key risk is unintentional current draw due to floating I/O pins or improper configuration of sleep modes. The AT32F421K8U7 supports multiple low-power modes, but peripherals like UART or PWM left active will prevent deep sleep entry. To mitigate this, ensure all unused I/Os are explicitly set to analog or pull-down mode, disable unused peripherals in clock control registers, and leverage the internal LVR and POR for stable operation during brownout conditions. Additionally, use the WDT selectively to avoid unintended wakeups. Real-world testing with current profiling across operating states is recommended to validate anticipated battery life.
Can the AT32F421K8U7 replace the STM32F411CEU6 in an existing motor control design, and what pin-to-pin or software compatibility issues should I expect?
While the AT32F421K8U7 offers similar performance to the STM32F411CEU6 (both Cortex-M4 at 120MHz), it is not pin-to-pin compatible due to differences in QFN package layout and I/O mapping. Moreover, peripheral register compatibility is limited. When replacing STM32F411CEU6 with the AT32F421K8U7, expect GPIO and timer remapping changes, plus differences in DMA and clock tree configuration. While both support 11x12-bit ADCs and advanced PWM, the AT32's proprietary HAL may require significant software rework. Always validate peripheral behavior under load and confirm timing-critical functions (e.g., field-oriented control loops) perform equivalently before full migration.
How does the AT32F421K8U7 handle thermal performance in a sealed 5x5mm QFN enclosure, and what PCB design practices should be followed to ensure reliability at 105°C ambient?
The AT32F421K8U7 in the 32-QFN (5x5) package has an exposed thermal pad that must be properly soldered to an internal ground plane for effective heat dissipation. At high ambient temperatures (up to 105°C), power dissipation from active peripherals or fast clock switching can lead to thermal throttling or long-term degradation if not managed. To ensure reliability, use at least a 2-layer PCB with a dedicated thermal via array under the exposed pad connected to a solid ground plane. Avoid placing heat-generating components nearby and consider derating total power consumption beyond 85°C. Monitoring internal junction temperature via the ADC and reducing clock speed dynamically can further improve robustness.
What are the implications of using only the internal oscillator with the AT32F421K8U7 in a precision timing application, and when should an external crystal be used?
The AT32F421K8U7 includes an internal high-speed oscillator, but its accuracy (±1% typical over temperature) may not suffice for applications requiring precise baud rates (e.g., UART at >4 Mbps) or synchronized communication (e.g., IrDA or LINbus). For designs demanding better than ±500ppm timing, such as real-time data logging or communication gateways, an external 8–16MHz crystal should be used with proper PCB layout: keep traces short, add series resistors if needed, and use appropriate loading capacitors. Also, note that USB or high-speed SPI timing may become unreliable with only internal clocking under voltage or temperature shifts.
Is the AT32F421K8U7 a reliable second source for the GD32F405RGV6 in high-volume consumer electronics, and what supply chain or firmware portability risks exist?
The AT32F421K8U7 can serve as a partial second source to GD32F405RGV6 in lower-pin-count applications, but key differences include reduced Flash (64KB vs 1MB), fewer I/Os (27 vs 51), and package limitations. Firmware portability is limited due to different memory maps and peripheral register sets, requiring HAL abstraction or significant code changes. Supply chain risk is lower with the AT32F421K8U7 due to steady inventory and RoHS compliance, but Artery’s tooling and debugger support are less mature than GigaDevice’s. For high-volume use, lock in MPQ (minimum package quantity) agreements and validate long-term availability via Artery’s roadmap commitments before full qualification.
Quality Assurance (QC)
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.
AT32F421K8U7 CAD Models
ARTERY AT32F421K8U7 PCB symbols & footprints
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