ATSAM4N8AA-MU - 100MHz Cortex-M4 MCU | Microchip | Industrial
MPN: ATSAM4N8AA-MU ✓ ActiveATSAM4N8AA-MU Overview
An ARM Cortex-M4 microcontroller belongs to the microcontroller hierarchy of embedded semiconductors. The Cortex-M4 core combines a 32-bit processing architecture, DSP instructions, a Memory Protection Unit, and the Thumb-2 instruction set. These features support efficient real-time control while providing basic digital signal-processing capability without requiring a separate DSP or higher-cost application processor.
Key device features include 512 KB of embedded Flash for firmware and data storage, 64 KB of SRAM for working memory, and a 100 MHz maximum clock frequency. The communication peripherals include five USARTs for serial links, two SPI controllers for synchronous buses, and three I²C controllers for low-pin-count peripheral connections. The integrated ADC provides eight channels with 12-bit resolution for analog measurement and control.
The SAM4N family is positioned for applications that need a capable Cortex-M4 core together with multiple serial interfaces and mixed signal inputs. Its combination of five USARTs, two SPI interfaces, and three I²C interfaces can consolidate communication tasks that would otherwise require several discrete interface controllers. The 512 KB Flash capacity also provides more room for embedded application code than many entry-level microcontrollers.
Typical uses include industrial automation equipment, appliance controllers, energy meters, consumer products, and connected embedded systems. The 48-QFN 7 mm × 7 mm package supports compact board layouts, while the assortment of serial peripherals is useful for sensor networks, actuator interfaces, display peripherals, external data storage, and service ports. The exact peripheral-sharing and electrical limits should be confirmed in the manufacturer datasheet for the selected board configuration.
Designers should follow the manufacturer guidance for power, decoupling, clock, and exposed-pad layout. The QFN thermal pad must be connected according to the package drawing, and the board must provide low-impedance return paths for high-frequency signals. Firmware should also allocate SRAM carefully and verify which timers, DMA channels, serial interfaces, and analog inputs can operate simultaneously at 100 MHz.
This page consolidates verified manufacturer and distributor information, documented communication resources, package information, sourcing data, and practical migration guidance. It also identifies where pin-level details, lifecycle metadata, or true drop-in alternatives must be verified directly with Microchip before a production design is released.
Drop-in alternatives for ATSAM4N8AA-MU — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ATSAM4N8AA-MU (same form factor and footprint) — differing in Core Processor, Package, SRAM, Core Size, Series.
ATSAM3N1AA-MU
✅ Drop-InContact for price
View Datasheet →ATSAM3N0AA-MU
✅ Drop-InContact for price
View Datasheet →ATSAM4N8AA-MU Maximum Ratings & Electrical Characteristics
| Product Type | 32-bit ARM Cortex-M4 microcontroller |
| Manufacturer | Microchip Technology |
| Series | SAM4N |
| Maximum CPU Frequency | 100 MHz |
| Processor Core | ARM Cortex-M4 |
| Architecture | 32-bit |
| Embedded Flash Memory | 512 KB |
| SRAM | 64 KB |
| Memory Protection Unit | Yes |
| DSP Instructions | Yes |
| Instruction Set | Thumb-2 |
| USART Count | 5 |
| SPI Controller Count | 2 |
| I2C Controller Count | 3 |
| ADC Resolution | 12-bit |
| ADC Channel Count | 8 channels |
| Package | 48-QFN (7 mm × 7 mm) |
| Mounting Type | Surface mount |
| Temperature Grade | Industrial temperature grade |
ATSAM4N8AA-MU 48-qfn (7 mm × 7 mm) Pin Configuration Guide
Pin configuration for ATSAM4N8AA-MU (48-qfn (7 mm × 7 mm) package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for ATSAM4N8AA-MU.
Refer to the datasheet for full pin configuration.
Typical Applications
ATSAM4N8AA-MU is suitable for 6 applications: Industrial Automation Controllers, Energy Metering Equipment, Appliance and Household Equipment, Sensor and Data Acquisition Systems, Industrial Communication Gateways, Consumer and Connected Embedded Products.
Industrial Automation Controllers
The ATSAM4N8AA-MU fits industrial automation control because its 100 MHz ARM Cortex-M4 core provides real-time processing capability while five USARTs, two SPI controllers, and three I²C controllers support diverse field equipment. The 512 KB of embedded Flash offers substantial room for control logic, diagnostics, communications protocols, and parameter storage, while 64 KB of SRAM supports working buffers and protocol stacks. The 8-channel 12-bit ADC can monitor analog process inputs when the device's electrical limits and pin multiplexing are suitable. Engineers should implement isolated interfaces, robust grounding, watchdog recovery, and hardware brownout detection for factory equipment rather than relying solely on firmware protection.
Recommended
Energy Metering Equipment
The ATSAM4N8AA-MU is suitable for energy-metering designs that require accurate control alongside several communication paths. Its 8-channel 12-bit ADC provides analog measurement inputs, while the 100 MHz Cortex-M4 core can execute calibration, compensation, data processing, and communication tasks. The 512 KB Flash capacity can hold metering algorithms, event logs, and configuration data, and the 64 KB SRAM can buffer sampled values. Five USARTs are useful for local service channels or downstream metering electronics, while I²C and SPI can connect display, storage, or sensor devices. The exact analog accuracy, reference-voltage requirements, metering suitability, and calibration conditions must be confirmed in the manufacturer documentation.
Recommended
Appliance and Household Equipment
ATSAM4N8AA-MU can serve as the central controller in appliances and household equipment that combine motor or valve control, user interfaces, sensors, and external communications. Its five USARTs and three I²C controllers allow multiple low-speed peripherals to coexist, while two SPI controllers can serve displays, flash storage, or higher-speed sensors. The 512 KB Flash and 64 KB SRAM provide ample resources for state machines, diagnostics, and communication protocols. The 48-QFN 7 mm × 7 mm package helps reduce board area in compact products, although exposed-pad soldering and thermal verification are essential. Firmware should include brownout, watchdog, and safe-state handling for motors and heaters.
Recommended
Sensor and Data Acquisition Systems
The ATSAM4N8AA-MU fits distributed sensor hubs and data-acquisition equipment where a fast core and several bus types are needed. The 8-channel 12-bit ADC supports multichannel analog measurement, while three I²C controllers can connect multiple sensors and two SPI controllers can support higher-throughput converters or storage devices. At up to 100 MHz, the Cortex-M4 core can filter, compensate, timestamp, and package sensor data before transmission through one of five USARTs. The 64 KB SRAM is suitable for bounded working buffers, but designers should avoid assuming that all DMA channels or serial peripherals can operate concurrently. Final channel count, sampling bandwidth, and analog front-end requirements depend on the datasheet clock and pin configuration.
Recommended
Industrial Communication Gateways
ATSAM4N8AA-MU is well matched to communication gateways that translate between local serial equipment and a host processor. Five USARTs support multiple RS-232, RS-485, or other serial links when suitable external interface circuits are fitted, while two SPI and three I²C ports connect local sensors, memories, and transceivers. The 100 MHz Cortex-M4 core can process protocol frames and maintain responsive traffic handling, and 512 KB of Flash accommodates gateway firmware, protocol handlers, and configuration data. Designers must check peripheral contention, DMA routing, buffer availability, and the complete pin multiplexing table. External protection, isolation, surge handling, and galvanic separation remain application-specific requirements.
Recommended
Consumer and Connected Embedded Products
The ATSAM4N8AA-MU can support connected consumer products that need deterministic embedded control, local serial connectivity, and analog input acquisition. The Cortex-M4 processor handles application logic and protocol processing at up to 100 MHz, while the three I²C and two SPI interfaces connect sensors, displays, and external storage. Five USARTs provide expansion paths for service, logging, radio, or accessory modules. Its 512 KB Flash and 64 KB SRAM allow more integrated firmware than smaller general-purpose MCUs, which may reduce the need for an external controller. The compact 48-QFN package assists board miniaturization, but consumers still need careful EMC layout, firmware update strategy, brownout handling, and production-grade connector protection.
Recommended
Recommended Products Summary
Engineering reference data for ATSAM4N8AA-MU — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAM3N1AA-MU | ATSAM3N0AA-MU |
|---|---|---|---|
| Package | 48-QFN (7 mm × 7 mm) | 48-QFN (7 mm × 7 mm) | 48-QFN (7 mm × 7 mm) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology |
| Processor Core | ARM Cortex-M4 | ARM Cortex-M3/Cortex-M4 family comparison required | ARM Cortex-M3/Cortex-M4 family comparison required |
Key Differentiators
- Higher serial-interface integration (vs ATSAM3N1AA-MU)
- Dedicated 12-bit analog acquisition (vs ATSAM3N0AA-MU)
- 100 MHz Cortex-M4 processing performance (vs ATSAM3N0AA-MU)
Design Notes
Follow the Microchip QFN land pattern and exposed-pad instructions exactly, including the recommended pad geometry, solder-mask definition, and reflow profile. The exposed thermal and electrical pad must be tied to the specified ground network rather than left floating. Maintain short input, output, and decoupling connections, and route high-current and high-frequency return paths away from sensitive analog inputs. Because the verified source set does not include a pin-by-pin package drawing, the current manufacturer package drawing must be used for production layout.
Place local bypass capacitors at the device supply pins and keep each loop as small as possible. The supplied data confirms a 100 MHz Cortex-M4 core but does not provide the complete internal regulator, decoupling, or maximum supply-voltage requirements, so those values must not be inferred. Use the manufacturer-recommended voltage tolerances and capacitor technology, verify startup current in the power budget, and provide brownout and reverse-polarity protection where required by the end product.
Treat clock, serial, and analog signals as potentially sensitive even though the verified sources do not provide complete edge-rate or impedance guidelines. Keep the main clock route short, provide a continuous reference plane, avoid splitting ground planes beneath the MCU, and place termination only if calculated from the actual edge rate and trace topology. For the 8-channel 12-bit ADC, use a quiet analog ground strategy, short traces, suitable source impedance, and filtering appropriate to the measured bandwidth.
Do not treat the SAM4N family-level pin-to-pin statement as proof that every SAM device is a drop-in replacement. The 48-QFN footprint, exposed pad, power pins, boot configuration, memory capacity, clock behavior, and peripheral multiplexing must all be checked. Before replacing ATSAM4N8AA-MU, compare the complete ordering code, verify the schematic against the alternative datasheet, and test startup, flash programming, ADC behavior, DMA routing, and every used serial interface.
Compliance Information
The verified distributor snippets identify a green industrial-temperature MCU, but they do not explicitly establish RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. These fields remain unknown rather than inferred. The product-page and distributor links in data_sources should be checked for current declarations and the exact ordering-code documentation.
