ATSAM3N0AA-AU - 48MHz Cortex-M3 MCU 32KB Flash | Microchip
MPN： ATSAM3N0AA-AU ✓ 啟用中ATSAM3N0AA-AU 概覽
A microcontroller (MCU) is a single integrated circuit that combines a processor core, memory, and programmable peripherals into one chip, forming the lowest tier of the embedded processing hierarchy: Cortex-M3 core -> ARM-based Flash MCU -> microcontroller -> semiconductor. The SAM3N series belongs to Microchip's SAM3 family of ARM-based Flash microcontrollers and targets cost-sensitive, high-volume embedded applications.
Key features include the ARM Cortex-M3 revision 2.0 core with Thumb-2 instruction set, a 24-bit SysTick timer, and a Nested Vector Interrupt Controller (NVIC). The device operates from 1.62V to 3.6V (1.8V/2.5V/3.3V supply classes) and is rated for industrial temperature operation. The -AU suffix denotes a 48-pin LQFP in a green, RoHS-compliant package supplied in trays.
Architecturally, the Cortex-M3 Harvard core delivers deterministic single-cycle Flash execution with efficient Thumb-2 code density, while the NVIC provides low-latency, prioritized interrupt handling essential for real-time control. The SAM3N series is pin-to-pin compatible with the SAM3S series and with legacy SAM7S devices (48- and 64-pin versions), enabling seamless migration paths for flash density and peripheral upgrades without PCB rework.
Typical applications include industrial control and automation nodes, consumer appliance interfaces, metering front-ends, and cost-optimized IoT sensor endpoints where 32-bit performance is needed at 8/16-bit MCU price points.
Design consideration: the ATSAM3N0AA-AU has no USB peripheral (that belongs to other SAM3 variants), so designs requiring high-speed USB should select an appropriate sibling part; also budget Flash and SRAM margins carefully since 32 KB Flash is the entry point of the family.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
直接替換替代品，適用於 ATSAM3N0AA-AU — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： ATSAM3N0AA-AU （相同外形與佔位） — 差異在於 Packaging, Flash Memory, SRAM, Core Processor, Connectivity.
ATSAM3N1AA-AU
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATSAM3N1BA-AU
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATSAM3S2AA-AU
✅ 直接替換聯絡詢價
查看資料表 →ATSAM3S4AA-AU
✅ 直接替換聯絡詢價
查看資料表 →ATSAM3N0AA-AU 最大額定值與電氣特性
| Core Processor | ARM Cortex-M3 revision 2.0 |
| Core Size | 32-bit |
| 最大時脈頻率 | 48 MHz |
| Flash Memory | 32 KB (32K x 8) |
| Instruction Set | Thumb-2 |
| SysTick Timer | 24-bit |
| Interrupt Controller | NVIC (Nested Vector Interrupt Controller) |
| 供應電壓 | 1.8 V / 2.5 V / 3.3 V |
| 封裝 | 48-LQFP (7x7 mm) |
| 安裝類型 | Surface Mount |
| Terminal Form | Gull Wing |
| Package Shape | Square (LFQFP) |
| Temperature Grade | Industrial |
| Package Color / Compliance | Green, RoHS (LQFP, Grn, IT, MRL a) |
| Packaging | Tray |
ATSAM3N0AA-AU green, rohs (lqfp, grn, it, mrl a) 腳位配置指南
ATSAM3N0AA-AU（green, rohs (lqfp, grn, it, mrl a) 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： ATSAM3N0AA-AU.
請參閱 資料表 以查看完整腳位配置。
典型應用
ATSAM3N0AA-AU 適用於 6 應用s: Industrial Control and Automation, Cost-Sensitive Consumer Appliances, Metering and Smart Energy Front-Ends, IoT Sensor Endpoints, Legacy SAM7S Design Migration, Test and Measurement Auxiliary Control.
Industrial Control and Automation
The ATSAM3N0AA-AU fits industrial control nodes because its 48 MHz Cortex-M3 core provides deterministic real-time interrupt response through the NVIC, while its industrial temperature grade and 1.8V-3.6V tolerance suit noisy factory environments. In a typical PLC expansion module or motor-control supervisory node, the MCU runs the control loop from single-cycle Flash while communicating over UART/SPI/I2C links. The 32 KB Flash holds protocol stacks and control code comfortably for fixed-function nodes; the 24-bit SysTick timer provides a preciseRTOS tick. Unlike 8-bit MCUs, the Thumb-2 instruction set delivers control arithmetic with fewer cycles, improving loop latency at the same clock. Estimated benefit: a PID loop executing in tens of microseconds at 48 MHz without an external coprocessor.
推薦
Cost-Sensitive Consumer Appliances
The SAM3N series was explicitly engineered, per the Atmel datasheet, with 'an aggressive price point and high level of integration' that pushes its use into cost-sensitive, high-volume consumer applications. At roughly $3.30 per unit (as of 2026-09-19), the ATSAM3N0AA-AU brings 32-bit computing to appliance user interfaces, small-home-appliance control boards, and toy/interactive products where an 8-bit MCU would struggle with UI rendering or communication stacks. The 48-pin 7x7 mm LQFP provides enough GPIO for keypad scanning, LED segments, and display control while remaining hand-solderable for prototyping. The green RoHS package simplifies global regulatory compliance for consumer SKUs, and tray packaging suits medium-volume SMT lines.
推薦
Metering and Smart Energy Front-Ends
Utility metering subsystems benefit from the ATSAM3N0AA-AU's combination of a 32-bit Cortex-M3 core for consumption calculations and low 1.8V/2.5V/3.3V supply flexibility for battery-backed or transformer-coupled designs. In an energy-meter communication module, the MCU aggregates pulse or SPI data from a metering AFE, formats frames, and drives an IR/RS-485 UART link - a workload well matched to 48 MHz and 32 KB Flash. The NVIC's low-latency, prioritized interrupts ensure sampling timers are serviced jitter-free, which matters for accumulation accuracy. Pin compatibility with the SAM3S family lets the same PCB scale to parts with integrated DACs or more Flash for DLMS/COSEM stacks without layout changes.
推薦
IoT Sensor Endpoints
For battery-powered IoT sensor endpoints, the ATSAM3N0AA-AU offers a favorable active-performance-per-mA profile: the Cortex-M3 completes sensing, filtering, and packet-formation tasks quickly at 48 MHz and can then enter low-power modes, reducing average current versus a slower 8-bit core that stays awake longer. The 32 KB Flash stores sensor drivers plus a lightweight protocol stack, and the 1.62V-3.6V operating window allows direct powering from a 3V coin cell via an LDO or from two AA cells. Typical node architecture places the SAM3N0AA between an I2C/SPI sensor and a UART-connected radio module, with the 24-bit SysTick providing a stable timebase for duty-cycled sampling. Firmware margin should be watched as stacks grow; the pin-compatible 64 KB ATSAM3N1AA-AU is the no-rework upgrade.
推薦
Legacy SAM7S Design Migration
The ATSAM3N0AA-AU is a documented migration target for legacy Atmel SAM7S designs: per the datasheet, SAM3N is pin-to-pin compatible with SAM7S legacy products in 48- and 64-pin versions. Engineering teams facing SAM7S end-of-life or supply constraints can drop the SAM3N0AA onto an existing 48-pin LQFP footprint, retaining the PCB while gaining a modern Cortex-M3 revision 2.0 core, Thumb-2 code density, and continued Microchip lifecycle support. Software requires porting from ARM7TDMI to Cortex-M3 (new interrupt controller model via NVIC, SysTick replacing manual timer setup), but peripheral-level register interfaces remain familiar across the SAM family. This makes the part a low-risk bridge that preserves board investments while modernizing the processing core.
推薦
Test and Measurement Auxiliary Control
Bench instruments, dongles, and sensor-conditioning boards frequently need a small auxiliary MCU for housekeeping tasks - front-panel key scanning, status LEDs, fan monitoring, and host communication. The ATSAM3N0AA-AU serves this role economically: its 48 MHz Cortex-M3 outperforms typical supervisory 8-bit MCUs, its NVIC prioritizes a periodic sampling interrupt above UART traffic, and its industrial temperature grade suits equipment that must survive warm enclosures. The 48-LQFP's 0.5 mm lead pitch is standard for automated assembly, and the green package aligns with most OEM environmental policies. With 32 KB Flash, firmware for a full command parser plus SPI bridge to the instrument's main processor fits with headroom; estimates suggest sub-20 KB for a typical command/telemetry application.
推薦
推薦產品摘要
工程參考資料，適用於 ATSAM3N0AA-AU — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | ATSAM3N0BA-AU | ATSAM3N1AA-AU | ATSAM3N1BA-AU | ATSAM3S2AA-AU | ATSAM3S4AA-AU |
|---|---|---|---|---|---|---|
| Package | 48-LQFP (7x7 mm) | 48-LQFP (7x7 mm) - same | 48-LQFP (7x7 mm) - same | 48-LQFP (7x7 mm) - same | 48-LQFP (7x7 mm) - same (pin-to-pin per datasheet) | 48-LQFP (7x7 mm) - same (pin-to-pin per datasheet) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | ARM Cortex-M3 rev 2.0 | ARM Cortex-M3 | ARM Cortex-M3 | ARM Cortex-M3 | ARM Cortex-M3 | ARM Cortex-M3 |
| Max Clock Frequency | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Flash Memory | 32 KB | 32 KB | 64 KB | 64 KB | 32 KB | 64 KB |
| Series Peripherals | SAM3N (base set) | SAM3N (base set) | SAM3N (base set) | SAM3N (base set) | SAM3S (richer peripheral set) | SAM3S (richer peripheral set) |
| Series Pin Compatibility | SAM3S / SAM7S (48-pin) compatible | SAM3N family - full compatibility | SAM3N family - full compatibility | SAM3N family - full compatibility | SAM3N compatible per datasheet | SAM3N compatible per datasheet |
主要差異化特點
- Lowest-cost entry to 32-bit SAM3 performance (對比ATSAM3S2AA-AU)
- In-family no-rework Flash upgrade path (對比ATSAM3N1AA-AU)
- Legacy SAM7S migration target (對比ATSAM3S4AA-AU)
設計說明
Verify memory margins before locking the ATSAM3N0AA-AU into production: 32 KB Flash is the entry point of the SAM3N family. Keep projected code size under roughly 26 KB (80% utilization) to leave space for field updates and bug fixes. If your application needs USB, note that the SAM3N series does not integrate the high-speed USB transceiver that other SAM3 family members provide - selecting this part for a USB application is a common sourcing-era mistake. Confirm the exact SRAM requirement of your protocol stacks against the datasheet memory map before finalizing the BOM.
The 48-LQFP (7x7 mm, 0.5 mm lead pitch) lands on a standard 48-LQFP footprint; because the SAM3N series is pin-to-pin compatible with SAM3S and SAM7S 48-pin parts, design the land pattern once and document alternate BOM line items (ATSAM3N0BA-AU, ATSAM3N1AA-AU, ATSAM3S2AA-AU) for sourcing flexibility. Place 100 nF ceramic decoupling capacitors at opposite corners of the package plus one bulk capacitor per supply rail, with short, low-inductance traces to the VDDIO/VDDCORE pins. Follow Microchip's SAM3N hardware design guidelines for oscillator and reset network values.
The Cortex-M3 core at 48 MHz produces fast edges on GPIO; for boards driving cables or long traces, enable the pins' controlled slew-rate settings where supported and add series termination (22-33 ohm) on clock and UART lines leaving the board. Keep the crystal or external clock traces short and guarded by ground, since the NVIC's low interrupt latency will faithfully capture glitches if clock integrity is poor. For mixed analog/digital nodes, assign SAM3N ground reference separation consistent with Microchip's application schematics in the SAM3N family datasheet typical applications.
合規資訊
DigiKey/Mouser list the part as 'LQFP, Grn, IT, MRL a' - 'Grn' denotes Microchip's green RoHS-compliant package. Formal REACH and conflict-minerals declarations should be obtained from Microchip's compliance portal.