ATSAM3X8EA-CU - ARM Cortex-M3 84MHz MCU 512KB Flash | Microchip
MPN: ATSAM3X8EA-CU ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.9 | $12.90 |
| 10 | $11.6 | $116.00 |
| 100 | $10.4 | $1,040.00 |
| 500 | $9.35 | $4,675.00 |
| 1,000 | $8.4 | $8,400.00 |
ATSAM3X8EA-CU Overview
A microcontroller (MCU) is a single integrated circuit that combines a processor core, program memory, data memory, and peripherals into one chip, forming the lowest layer of the embedded system hierarchy (MCU -> system-on-chip -> embedded processor -> semiconductor device). The SAM3X/A series belongs to Microchip's (formerly Atmel) ARM-based Flash MCU family, based on the high-performance ARM Cortex-M3 RISC processor with the Thumb-2 instruction set.
Key features include dual-bank 2 x 256KB Flash memory enabling safe in-application programming, a Memory Protection Unit (MPU) for robust firmware partitioning, a 24-bit SysTick counter, and a Nested Vector Interrupt Controller (NVIC) for deterministic interrupt handling.
The connectivity portfolio is a major strength: the device integrates CAN, Ethernet (MAC), EBI/EMI external bus interface, I2C, IrDA, LIN, MMC/SD, SPI, UART and USB peripherals, plus a NAND Flash Controller (NFC) with an additional 4KB of dedicated SRAM. Rich analog and timer peripherals make it suitable for motor control and data acquisition.
Typical applications include 3D printer mainboards (the same core powers the well-known Arduino Due), industrial automation controllers, Ethernet/CAN gateways, and embedded networking equipment.
Design-wise, plan the Flash dual-bank layout for OTA updates and allow margin on the 3.3V supply rail for the 1.62V to 3.6V operating envelope; BGA-144 assembly requires X-ray inspection capability.
This page synthesizes distributor pricing, drop-in alternatives within the SAM3X family, and practical design notes not found in the manufacturer datasheet, as of 2026-09-20.
Drop-in alternatives for ATSAM3X8EA-CU — 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 ATSAM3X8EA-CU (same form factor and footprint) — differing in Connectivity, Flash Memory, Memory Protection, Package, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAM3X8CA-CU
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$8.9 / Unit
View Datasheet →ATSAM3X4EA-CU
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$6.3 / Unit
View Datasheet →ATSAM3X4CA-CU
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$6.1 / Unit
View Datasheet →ATSAM3X8EA-CU Maximum Ratings & Electrical Characteristics
| Core Processor | ARM Cortex-M3 |
| Core Size | 32-Bit |
| Maximum Clock Speed | 84 MHz |
| Flash Memory | 512KB (512K x 8), 2 x 256KB banks |
| SRAM | 100KB (64KB + 32KB banks) + 4KB NFC SRAM |
| Series | SAM3X |
| Connectivity | CAN, EBI/EMI, Ethernet, I2C, IrDA, LIN, MMC, SPI, UART, USB |
| Memory Protection | Memory Protection Unit (MPU) |
| Instruction Set | Thumb-2 |
| SysTick Counter | 24-bit |
| Interrupt Controller | Nested Vector Interrupt Controller (NVIC) |
| Package | 144-BGA (13 x 13 mm) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant (GREEN package per Mouser listing) |
ATSAM3X8EA-CU 144-bga (13 x 13 mm) Pin Configuration Guide
Pin configuration for ATSAM3X8EA-CU (144-bga (13 x 13 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 ATSAM3X8EA-CU.
Refer to the datasheet for full pin configuration.
Typical Applications
ATSAM3X8EA-CU is suitable for 6 applications: 3D Printer Mainboards, Industrial Automation Controllers, Ethernet/CAN Gateways, Embedded Data Loggers, Test and Measurement Instruments, Motor Control Drives.
3D Printer Mainboards
The ATSAM3X8EA-CU is the silicon behind the Arduino Due, which became a de-facto standard for high-performance 3D printer mainboards. Its 84 MHz Cortex-M3 core executes step-generation algorithms with far more headroom than 8-bit AVR boards, enabling higher microstepping rates and smoother motion planning on multi-axis printers. The 512KB dual-bank Flash stores large firmware images (Marlin-class builds with network modules), while 100KB SRAM holds look-ahead planning buffers. USB device connectivity supports host communication and firmware updates via the ROM bootloader; the MPU helps isolate critical motion code from user-added modules.
Recommended
Industrial Automation Controllers
In factory automation nodes, the ATSAM3X8EA-CU combines a deterministic 84 MHz Cortex-M3 core with the peripherals industrial designs need: dual CAN for fieldbus links, EBI/EMI for attaching external memory or FPGA-based I/O expansion, and a rich timer suite for PWM-driven actuators and quadrature decoding. The Memory Protection Unit allows firmware partitioning between a safety-relevant control task and less-critical communication stacks. The dual-bank Flash architecture supports field firmware updates without bricking remote equipment, and the industrial temperature GREEN package suits control-cabinet environments.
Recommended
Ethernet/CAN Gateways
Protocol-conversion gateways between CAN fieldbuses and Ethernet backbones are a natural fit for the ATSAM3X8EA-CU because the device integrates both an Ethernet MAC and CAN controllers on one chip, eliminating external bridge ICs. The 84 MHz core handles lightweight TCP/IP stacks while servicing CAN traffic with DMA buffering in the 100KB SRAM. The EBI/EMI interface can expand RAM or attach dual-port memory for jitter-free packet buffering, and the 4KB NFC SRAM supports logging to serial NAND Flash for diagnostics. Dual-bank Flash enables remote firmware field updates over the Ethernet link.
Recommended
Embedded Data Loggers
The NAND Flash Controller with its dedicated 4KB SRAM and the MMC/SD card controller make the ATSAM3X8EA-CU well suited for rugged data-logging products. Sensor streams collected through its ADC, SPI, and I2C peripherals are written to SD cards or managed NAND with hardware-assisted ECC buffering, offloading the CPU. The 512KB Flash retains configuration, calibration tables, and a compact operating system locally, while the 84 MHz core performs timestamping and compression. The industrial temperature range and low-power modes support battery-backed installations in remote monitoring cabinets.
Recommended
Test and Measurement Instruments
Bench and handheld instruments benefit from the ATSAM3X8EA-CU's combination of 84 MHz processing, USB device connectivity for PC control, and EBI/EMI for attaching high-speed acquisition front ends or display modules. The Thumb-2 instruction set and NVIC provide deterministic interrupt latency needed for time-critical measurement sequencing, while the 100KB SRAM buffers waveform samples before transfer. The Memory Protection Unit supports layered firmware architectures separating measurement kernels from user-interface code, and dual-bank Flash permits feature upgrades in the field without returning units to the factory.
Recommended
Motor Control Drives
The SAM3X peripheral set includes PWM timers with complementary outputs and fault inputs, ADCs, and CAN - the classic requirement set for embedded motor drives. The ATSAM3X8EA-CU executes field-oriented control loops at 84 MHz with cycle-efficient Thumb-2 code, while hardware PWM generates the inverter gate signals and CAN links the drive to factory controllers. The EBI/EMI interface allows external gate-driver FPGA or memory expansion in modular drive platforms. The MPU assists with functional-safety partitioning between control and diagnostics firmware in industrial drive products.
Recommended
Recommended Products Summary
Engineering reference data for ATSAM3X8EA-CU — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAM3X8CA-CU | ATSAM3X4EA-CU | ATSAM3X4CA-CU |
|---|---|---|---|---|
| Package | 144-BGA (13 x 13 mm) | 144-BGA (13 x 13 mm) - same | 144-BGA (13 x 13 mm) - same | 144-BGA (13 x 13 mm) - same |
| Brand | Microchip Technology (Atmel) | Microchip Technology | Microchip Technology | Microchip Technology |
| Core / Speed | ARM Cortex-M3, 84 MHz | ARM Cortex-M3, 84 MHz | ARM Cortex-M3, 84 MHz | ARM Cortex-M3, 84 MHz |
| Flash Memory | 512KB (2 x 256KB banks) | 256KB (2 x 128KB banks) | 256KB | 256KB |
| CAN Controllers | Dual CAN | Dual CAN | Single CAN | Single CAN |
| Ethernet MAC | Yes | Yes | Yes | Yes |
| Typical Use | Large firmware, OTA dual-bank, Arduino Due-class designs | Cost-reduced 3D printer / gateway builds | Single-CAN industrial control | Entry industrial Ethernet nodes |
Key Differentiators
- Largest Flash in the pin-compatible family (vs ATSAM3X8CA-CU)
- Dual CAN controllers (vs ATSAM3X4EA-CU)
- Arduino Due ecosystem compatibility (vs STM32F103C8T6)
Design Notes
The 144-ball BGA (13 x 13 mm) requires controlled PCB fabrication: use a minimum 0.2 mm via-in-pad or dog-bone fanout with 4+ layer stackup for the 0.8 mm ball pitch typical of this package. Plan for X-ray or AOI inspection capability in production, since BGA solder joints cannot be visually inspected. Keep the ~3.3V supply rail plane solid beneath the device, and place decoupling capacitors on the opposite side of the board directly beneath the power ball cluster per the SAM3X/A datasheet layout guidance.
Most BGA balls are multiplexed between GPIO and peripheral functions via the PIO controller; verify final pin assignments against the SAM3X pin multiplexing tables before layout freeze, because conflicts discovered after routing often force a board respin. Flash programming runs from one bank at a time - if firmware executes from the bank being erased, the CPU stalls; use the dual-bank swap architecture for in-application updates rather than erase-while-executing from the same bank.
Estimated: budget core and I/O current per the SAM3X/A datasheet electrical characteristics tables rather than assuming Arduino Due board-level figures, which include regulators and USB circuitry. Provide decoupling as specified in the datasheet power distribution section, and keep the peripheral clock tree (PMC) configured so unused peripheral clocks are gated to reduce dynamic current in battery-sensitive designs. Add margin on the supply rail for Ethernet PHY transients if networking is used.
Compliance Information
Listed as GREEN package on Mouser (RoHS/lead-free per Microchip GREEN designation). Formal REACH and conflict-minerals declarations should be obtained from Microchip product compliance documentation.
