ATSAME51J20A-MU-EFP - 120MHz Cortex-M4F MCU 1MB Flash | Microchip
MPN: ATSAME51J20A-MU-EFP ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.62 | $8.62 |
| 10 | $7.69 | $76.90 |
| 100 | $6.45 | $645.00 |
| 500 | $5.82 | $2,910.00 |
| 1,000 | $5.34 | $5,340.00 |
ATSAME51J20A-MU-EFP Overview
A microcontroller (MCU) is a single-chip computer that combines a processor core, program and data memory, peripherals, and I/O on one die. The ARM Cortex-M4F core is a mainstream 32-bit processor family augmented by a single-precision FPU and DSP extensions, designed for deterministic real-time control. SAM E51 microcontrollers sit inside the broader hierarchy: ARM Cortex-M -> 32-bit MCU -> embedded microcontroller -> semiconductor. SAME51 also features FPU and DSP extensions that accelerate floating-point math in motor control and signal processing code.
Key specifications include 120 MHz core clock, 1 MB dual-panel Flash with ECC, 256 KB SRAM, and a 64-pin VQFN package with 9x9 mm body and an exposed thermal pad. The device integrates a 12-bit ADC, DAC, SERCOM peripherals, USB 2.0 Full-Speed with on-chip PHY, CAN-FD, and a 2-channel 16-bit timer/counter for PWM generation. Integrated SD/MMC host controller and I2S audio interfaces enable storage and digital audio applications.
Architecturally, the SAM E51 uses a multi-AHB bus matrix with separate code and system buses, allowing simultaneous Flash fetch and DMA transfers without contention. Error-Correction Code on Flash and SRAM improves reliability in industrial environments. The device operates from 1.71V to 3.6V and includes an on-chip voltage regulator, POR, and brown-out detector.
Typical applications include industrial control and Human-Machine Interface (HMI) panels, low-cost motor drives (BLDC, FOC, stepper), IoT edge nodes with USB and CAN connectivity, and consumer devices requiring graphical LCD or audio playback. Its wide peripheral set also suits home automation gateways and Building Automation controllers.
When designing with this MCU, place at least four 100 nF decoupling capacitors near the supply pins, plus a bulk 4.7 uF on VDDIN, and solder the exposed thermal pad with multiple thermal vias to the ground plane for thermal dissipation. Use the SAME51 header file and the MPLAB Harmony 3 framework to configure SERCOM, ADC, and timer peripherals, which avoids register-level bugs.
This page consolidates distributor pricing, verified drop-in alternatives, and design notes not typically found in the manufacturer datasheet, helping procurement and firmware teams make informed decisions for production.
Drop-in alternatives for ATSAME51J20A-MU-EFP — 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 ATSAME51J20A-MU-EFP (same form factor and footprint) — differing in Package, ADC, MSL Level, Operating Voltage, CAN.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAME51J19A-MU-EFP
✅ Drop-In✓ In Stock
$4.85 / Unit
View Datasheet →ATSAME51J20A-MU
✅ Drop-In✓ In Stock
$4.78 / Unit
View Datasheet →ATSAME51J20A-AUT-EFP
✅ Drop-In✓ In Stock
$5.42 / Unit
View Datasheet →ATSAME51J19A-MUT-EFP
✅ Drop-In✓ In Stock
$2.43 / Unit
View Datasheet →ATSAME51J19A-AUT-EFP
✅ Drop-In✓ In Stock
$6.45 / Unit
View Datasheet →ATSAME51G19A-MU-EFP
✅ Drop-In✓ In Stock
$5.2 / Unit
View Datasheet →ATSAME51J20A-MU-EFP Maximum Ratings & Electrical Characteristics
| Core | ARM Cortex-M4F with FPU and DSP extensions |
| Core Clock Speed | 120 MHz |
| Program Memory | 1 MB dual-panel Flash with ECC |
| SRAM | 256 KB |
| Operating Voltage | 1.71 V to 3.6 V |
| Package | 64-pin VQFN (9x9 mm) with exposed pad |
| Mounting Type | Surface Mount |
| Supply Voltage (VDDIN) | 3.3 V typical |
| USB | USB 2.0 Full-Speed Device/Host with on-chip PHY |
| CAN | CAN-FD |
| Operating Temperature | -40 C to +85 C (industrial) |
| MSL Level | 3 |
| RoHS Status | Compliant |
ATSAME51J20A-MU-EFP 64-pin vqfn (9x9 mm) with exposed pad Pin Configuration Guide
Pin configuration for ATSAME51J20A-MU-EFP (64-pin vqfn (9x9 mm) with exposed pad 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 ATSAME51J20A-MU-EFP.
Refer to the datasheet for full pin configuration.
Typical Applications
ATSAME51J20A-MU-EFP is suitable for 6 applications: Industrial Human-Machine Interface (HMI) Panels, BLDC and FOC Motor Control, USB-Connected IoT Edge Devices, Building Automation and HVAC Controllers, Consumer Audio Products, CAN-FD Automotive ECUs.
Industrial Human-Machine Interface (HMI) Panels
The ATSAME51J20A-MU-EFP drives industrial HMI panels using its 120 MHz Cortex-M4F core and 1 MB Flash to render graphics, manage touch input, and run communication stacks. The integrated USB Full-Speed and CAN-FD peripherals connect directly to industrial controllers without external transceivers, while 256 KB SRAM holds framebuffers and protocol buffers. The 1.71-3.6V supply range tolerates 24V industrial rails stepped down with a switching regulator. Typical HMI tasks - parsing Modbus TCP, debouncing capacitive touch, and animating icons - consume less than 60% of CPU, leaving headroom for predictive-maintenance algorithms.
Recommended
BLDC and FOC Motor Control
The ATSAME51J20A-MU-EFP is well-suited for sensorless BLDC and Field-Oriented Control (FOC) motor drives thanks to dedicated Timer/Counter for Control (TCC) modules with complementary PWM outputs and dead-time insertion. The Cortex-M4F core executes FOC math at 120 MHz with hardware floating point, closing current loops well under 10 microseconds. Its 12-bit ADC synchronizes with PWM for precise current sampling, and the integrated op-amps (where present on the family) reduce external analog components. Designers typically pair the MCU with a 3-phase gate driver like the MCP8024 to drive MOSFET bridges up to several hundred watts.
Recommended
USB-Connected IoT Edge Devices
The ATSAME51J20A-MU-EFP serves USB-connected IoT edge nodes, leveraging its USB 2.0 Full-Speed port with on-chip PHY to communicate with a host without external transceivers. The 120 MHz Cortex-M4F processes sensor data and runs encryption (AES via crypto accelerator on the family) before forwarding to the host. The 1 MB Flash stores both application and bootloader, supporting dual-bank live firmware updates critical for deployed edge nodes. With industrial temperature range and ECC memory, the MCU is a dependable bridge between local sensors and USB-attached gateways.
Recommended
Building Automation and HVAC Controllers
In building automation controllers, the ATSAME51J20A-MU-EFP handles HVAC sequences with multiple temperature sensors, manages Modbus or BACnet over RS-485, and drives relay outputs. The Cortex-M4F executes complex control algorithms while CAN-FD connects to other building subsystems like elevators or access control. With 256 KB SRAM, it can buffer multiple communication transactions in parallel. The wide 1.71-3.6V operating range handles power-supply fluctuations common in long cable runs of building networks, and the dual-bank Flash enables safe field firmware upgrades.
Recommended
Consumer Audio Products
The ATSAME51J20A-MU-EFP powers consumer audio products, decoding audio from SD cards or USB and outputting via I2S to a DAC. The Cortex-M4F's DSP extensions accelerate MP3/AAC decoding and equalizer computations, while the 256 KB SRAM buffers audio frames without dropouts. The integrated USB device port allows easy firmware updates and HID control from a host PC. The wide operating voltage range supports both battery-powered and mains-powered designs, and the small 64-pin VQFN package fits into compact portable enclosures.
Recommended
CAN-FD Automotive ECUs
The ATSAME51J20A-MU-EFP serves CAN-FD-enabled automotive Electronic Control Units, integrating the CAN-FD controller for high-bandwidth vehicle network communication. For AEC-Q100 qualified deployments, the ATSAME51J20A-AUT-EFP variant is the drop-in replacement with automotive qualification. The 1 MB dual-bank Flash supports ASIL-relevant firmware partitioning and live updates, while ECC memory detects bit flips from vehicle EMI. The 120 MHz core with FPU handles automotive sensor fusion and diagnostics in real time, making this MCU a reliable choice for body and chassis ECUs.
Recommended
Recommended Products Summary
Engineering reference data for ATSAME51J20A-MU-EFP — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAME51J19A-MU-EFP | ATSAME51J20A-MU | ATSAME51J20A-AUT-EFP | ATSAME51G19A-MU-EFP |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | VQFN-64 (9x9 mm) | VQFN-64 (9x9 mm) | VQFN-64 (9x9 mm) | VQFN-64 (9x9 mm) | VQFN-64 (9x9 mm) |
| Core | Cortex-M4F 120 MHz | Cortex-M4F 120 MHz | Cortex-M4F 120 MHz | Cortex-M4F 120 MHz | Cortex-M4F 120 MHz |
| Flash Memory | 1 MB | 512 KB | 1 MB | 1 MB | 512 KB |
| SRAM | 256 KB | 192 KB | 256 KB | 256 KB | 192 KB |
| Operating Voltage | 1.71 V to 3.6 V | 1.71 V to 3.6 V | 1.71 V to 3.6 V | 1.71 V to 3.6 V | 1.71 V to 3.6 V |
| AEC-Q100 Qualified | No | No | No | Yes | No |
| Packaging | Tray | Tray | Tray | Tape and Reel | Tray |
Key Differentiators
- 1 MB dual-bank Flash with ECC (vs ATSAME51J19A-MU-EFP)
- AEC-Q100 automotive qualification option (vs ATSAME51J20A-MU)
- J-series peripheral set vs G-series (vs ATSAME51G19A-MU-EFP)
Design Notes
Place at least four 100 nF decoupling capacitors close to the VDD pins, plus a single bulk 4.7 uF ceramic capacitor on VDDIN. The exposed thermal pad under the VQFN package must be soldered to the PCB ground plane with multiple thermal vias (typically 9 in a 3x3 array, 0.3 mm diameter) to dissipate power and provide a low-impedance ground return. Estimated: at 120 MHz full operation with USB active, total supply current can reach 80 mA - the bulk cap prevents voltage droop during USB suspend/resume transitions.
Do not enable dual-bank Flash until the bootloader is verified, because misconfigured bank switching can lock the device. Use the SAM-BA bootloader or Atmel-ICE for initial programming before locking the security bit. Ensure the NVMCTRL (Non-Volatile Memory Controller) configuration matches the chosen row size (typically 256 bytes for SAME51), otherwise Flash writes will silently fail. Estimated: programming failures due to incorrect row size cost hours of debug time.
Route the 32 kHz crystal traces symmetrically with short lengths and keep them away from switching signals to minimize stray capacitance, which detunes the low-frequency oscillator. The HS USB DP/DM traces must be 90 ohm differential with no stubs, and route them on the top layer directly above a continuous ground pour. Estimated: USB signal integrity issues commonly trace back to poor DP/DM impedance control rather than MCU silicon problems.
Compliance Information
RoHS compliant per distributor listings. Standard variant is not AEC-Q100 qualified - select ATSAME51J20A-AUT-EFP for automotive. Halogen-free status not explicitly stated in web data.
