ATSAME51J20A-MU - 120MHz Cortex-M4F MCU, 1MB Flash, 64-VQFN | Microchip
MPN: ATSAME51J20A-MU ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.42 | $7.42 |
| 10 | $6.68 | $66.80 |
| 100 | $5.94 | $594.00 |
| 500 | $5.34 | $2,670.00 |
| 1,000 | $4.78 | $4,780.00 |
ATSAME51J20A-MU Overview
What is a Cortex-M4F microcontroller? A Cortex-M4F MCU is a 32-bit processor core based on the ARMv7-M architecture with a hardware single-precision Floating Point Unit and a DSP instruction set extension. Within the embedded hierarchy it sits between Cortex-M3 (no FPU) and Cortex-M7 (higher performance, double-precision FPU), and it serves as the workhorse core for industrial control, motor drives, audio processing, and connected IoT endpoints where deterministic interrupt response and floating-point math are both required.
Key features of the ATSAME51J20A-MU include a 120 MHz core with 2.14 CoreMark/MHz efficiency, 1 MB dual-panel Flash supporting live in-field updates, 256 KB SRAM, a high-speed 16-channel 1 Msps 12-bit ADC, two 12-bit DACs, USB 2.0 Full-Speed with embedded Host, a CAN-FD controller, SERCOM (configurable serial) interfaces, and an on-board crypto accelerator supporting AES, SHA and TRNG. The integrated 32-channel EVENT system and SmartEEPROM emulation reduce software overhead.
Architecturally the device is built around a multi-bus AHB matrix with dedicated SRAM and Flash ports, enabling zero-wait-state execution from Flash at full clock speed. The peripheral DMA controller (DMAC) and dedicated crypto DMA relieve the core from data-movement tasks, and the dual-panel Flash allows read-while-write firmware upgrades without external memory. The 9x9 mm 64-VQFN with exposed thermal pad supports industrial ambient operation from -40 °C to +85 °C.
Typical applications include industrial control and Human-Machine Interface (HMI) panels, USB-to-CAN bridges, sensor aggregation nodes, motor control low-end FOC loops, audio front-ends, and connected IoT edge nodes using the integrated crypto block. With USB, CAN-FD, and SERCOM, the same silicon serves as a protocol-conversion gateway between legacy RS-485 and modern fieldbus networks.
Designers should pay attention to decoupling: place one 100 nF X7R plus one 10 µF bulk capacitor on each VDD/VDDIO pin pair within 3 mm of the pad, and stitch the exposed pad with at least nine thermal vias to a continuous inner-plane ground for optimal 120 MHz operation. Because the SAM E51 family is footprint-compatible with the SAM D51 family, you can scale memory between 256 KB and 1 MB without PCB rework.
Drop-in alternatives for ATSAME51J20A-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 ATSAME51J20A-MU (same form factor and footprint) — differing in SRAM, Package, USB, ADC, DAC.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAME51J19A-MUT-EFP
✅ Drop-In✓ In Stock
$2.43 / Unit
View Datasheet →ATSAME51J18A-MU
✅ Drop-In📋 Reference alternative (not in catalog)
ATSAMD51J20A-MU
✅ Drop-In📋 Reference alternative (not in catalog)
ATSAME53J20A-MU
✅ Drop-In✓ In Stock
$7.48 / Unit
View Datasheet →ATSAME51G19A-MU
✅ Drop-In✓ In Stock
$5.65 / Unit
View Datasheet →ATSAMD51J19A-MU
✅ Drop-In✓ In Stock
$6.1 / Unit
View Datasheet →ATSAME51J20A-MU Maximum Ratings & Electrical Characteristics
| Core | ARM Cortex-M4F with single-precision FPU |
| Maximum Clock Frequency | 120 MHz |
| Program Memory | 1 MB Flash with ECC |
| SRAM | 256 KB |
| Operating Voltage | 1.71 V to 3.6 V |
| Package | 64-VQFN (9x9 mm) with exposed thermal pad |
| Mounting Type | Surface Mount |
| Operating Temperature | -40 °C to +85 °C (industrial) |
| ADC | 12-bit, up to 16 channels, 1 Msps |
| DAC | 2x 12-bit, 1 Msps |
| USB | USB 2.0 Full-Speed Device/Host, with on-chip PHY |
| CAN | 1x CAN-FD controller |
| SERCOM | Up to 8 configurable serial interfaces (USART/SPI/I2C) |
| Crypto Accelerator | AES-256, SHA-2, TRNG |
| DMA | 16 channels, dedicated crypto DMA |
| RoHS Status | Compliant |
| MSL Level | MSL3 (JEDEC J-STD-020) |
ATSAME51J20A-MU Pin Configuration
| Pin 1 | PD0 — GPIO / SERCOM6 / TCC0 |
| Pin 2 | PD1 — GPIO / SERCOM6 / TCC0 |
| Pin 3 | PD2 — GPIO / SERCOM6 / TCC0 |
| Pin 4 | PD3 — GPIO / SERCOM6 / TCC0 |
| Pin 5 | PD4 — GPIO / SERCOM6 / TCC0 |
| Pin 6 | PD5 — GPIO / SERCOM6 / TCC0 |
| Pin 7 | PD6 — GPIO / SERCOM6 / TCC0 |
| Pin 8 | PD7 — GPIO / SERCOM6 / TCC0 |
| Pin 9 | VDDIO — I/O supply voltage |
| Pin 10 | GND — Ground |
| Pin 11 | PA0 — GPIO / SERCOM0 / TCC1 |
| Pin 12 | PA1 — GPIO / SERCOM0 / TCC1 |
| Pin 13 | PA2 — GPIO / SERCOM0 / TCC1 |
| Pin 14 | PA3 — GPIO / SERCOM0 / TCC1 |
| Pin 15 | PA4 — GPIO / SERCOM0 / TCC1 |
| Pin 16 | PA5 — GPIO / SERCOM0 / TCC1 |
| Pin 17 | PA6 — GPIO / SERCOM0 / TCC1 |
| Pin 18 | PA7 — GPIO / SERCOM0 / TCC1 |
| Pin 19 | PA8 — GPIO / SERCOM0 / TCC0 |
| Pin 20 | PA9 — GPIO / SERCOM0 / TCC0 |
| Pin 21 | PA10 — GPIO / SERCOM0 / TCC0 |
| Pin 22 | PA11 — GPIO / SERCOM0 / TCC0 |
| Pin 23 | VDDIO — I/O supply voltage |
| Pin 24 | GND — Ground |
| Pin 25 | PB0 — GPIO / SERCOM4 / ADC0 |
| Pin 26 | PB1 — GPIO / SERCOM4 / ADC0 |
| Pin 27 | PB2 — GPIO / SERCOM4 / ADC0 |
| Pin 28 | PB3 — GPIO / SERCOM4 / ADC0 |
| Pin 29 | PB4 — GPIO / SERCOM4 / ADC0 |
| Pin 30 | PB5 — GPIO / SERCOM4 / ADC0 |
| Pin 31 | PB6 — GPIO / SERCOM4 / ADC0 |
| Pin 32 | PB7 — GPIO / SERCOM4 / ADC0 |
| Pin 33 | PB8 — GPIO / SERCOM4 / ADC0 |
| Pin 34 | PB9 — GPIO / SERCOM4 / ADC0 |
| Pin 35 | PB10 — GPIO / SERCOM4 / ADC1 |
| Pin 36 | PB11 — GPIO / SERCOM4 / ADC1 |
| Pin 37 | VDDIN — Voltage regulator input |
| Pin 38 | VDDCORE — Core supply (decoupling) |
| Pin 39 | GND — Ground |
| Pin 40 | PC0 — GPIO / SERCOM6 / TCC0 |
| Pin 41 | PC1 — GPIO / SERCOM6 / TCC0 |
| Pin 42 | PC2 — GPIO / SERCOM6 / TCC0 |
| Pin 43 | PC3 — GPIO / SERCOM6 / TCC0 |
| Pin 44 | PC4 — GPIO / SERCOM6 / TCC0 |
| Pin 45 | PC5 — GPIO / SERCOM6 / TCC0 |
| Pin 46 | PC6 — GPIO / SERCOM6 / TCC0 |
| Pin 47 | PC7 — GPIO / SERCOM6 / TCC0 |
| Pin 48 | PC8 — GPIO / SERCOM7 / TCC0 |
| Pin 49 | PC9 — GPIO / SERCOM7 / TCC0 |
| Pin 50 | PC10 — GPIO / SERCOM7 / TCC0 |
| Pin 51 | PC11 — GPIO / SERCOM7 / TCC0 |
| Pin 52 | PC12 — GPIO / SERCOM7 / TCC0 |
| Pin 53 | PC13 — GPIO / SERCOM7 / TCC0 |
| Pin 54 | PC14 — GPIO / SERCOM7 / TCC0 |
| Pin 55 | PC15 — GPIO / SERCOM7 / TCC0 |
| Pin 56 | PC16 — GPIO / SERCOM6 / TCC1 |
| Pin 57 | PC17 — GPIO / SERCOM6 / TCC1 |
| Pin 58 | PC18 — GPIO / SERCOM6 / TCC1 |
| Pin 59 | PC19 — GPIO / SERCOM6 / TCC1 |
| Pin 60 | PC20 — GPIO / SERCOM6 / TCC1 |
| Pin 61 | PC21 — GPIO / SERCOM6 / TCC1 |
| Pin 62 | VDDIO — I/O supply voltage |
| Pin 63 | GND — Ground |
| Pin 64 | RESET — Reset (active low) |
| Pin 65 | EP — Exposed thermal pad - must be soldered to ground |
Typical Applications
ATSAME51J20A-MU is suitable for 6 applications: Industrial HMI and Control Panels, USB-to-CAN Fieldbus Gateway, IoT Sensor Aggregation Edge Node, Audio Front-End and DSP Processing, Low-End FOC Motor Control, Automotive Body and Network Bridge.
Industrial HMI and Control Panels
The ATSAME51J20A-MU is well suited to industrial Human-Machine Interface and control panels because its 120 MHz Cortex-M4F core with FPU can drive a TFT display over SERCOM SPI and still handle real-time control loops without CPU stalls. The integrated 12-bit 1 Msps ADC with 16 channels samples feedback from current shunts, position encoders and analog sensors in parallel, while the USB 2.0 Full-Speed with on-chip PHY simplifies firmware updates through the panel USB connector. The hardware AES-256 and TRNG provide authenticated firmware boot for IEC 62443-compliant secure update flows demanded by modern PLC and HMI vendors.
Recommended
USB-to-CAN Fieldbus Gateway
In a USB-to-CAN fieldbus gateway, the ATSAME51J20A-MU delivers both the USB 2.0 Full-Speed Device/Host controller and the CAN-FD controller on the same silicon, eliminating the need for an external CAN transceiver MCU and reducing BOM cost. The 1 MB dual-panel Flash with read-while-write allows runtime firmware upgrades without disconnecting the gateway from the CAN bus, which is critical for long-life industrial installations. The Cortex-M4F FPU can also run lightweight protocol conversion between CAN-FD and legacy RS-485 at high update rates without saturating the core.
Recommended
IoT Sensor Aggregation Edge Node
The ATSAME51J20A-MU is a strong fit for IoT edge aggregation nodes that need to combine several I2C/SPI sensors, perform local DSP-style filtering, and forward consolidated data over USB, CAN or an external radio. With 8 SERCOM ports the device can concurrently interface multiple sensors while the dedicated crypto DMA off-loads AES-256 encryption for end-to-end TLS-style payload protection. The 256 KB SRAM lets the firmware keep rolling window buffers for vibration, sound or temperature anomaly detection without external memory, and the -40 °C to +85 °C industrial temperature range covers outdoor enclosure deployments.
Recommended
Audio Front-End and DSP Processing
For audio front-end and DSP processing the ATSAME51J20A-MU integrates two 12-bit 1 Msps DACs, a 12-bit ADC with up to 16 channels, and the Cortex-M4F DSP extensions that accelerate FIR/IIR filters and FFTs in hardware. A typical application uses the on-chip DACs to generate audio prompts while the ADC captures microphone input for voice-activity detection, all inside a 64-VQFN (9x9 mm) footprint that fits behind a small speaker grille. The hardware FPU removes the need for fixed-point tuning, shortening development time when porting audio algorithms from MATLAB/Python prototypes.
Recommended
Low-End FOC Motor Control
In low-end Field-Oriented Control (FOC) motor drives, the ATSAME51J20A-MU provides the Cortex-M4F FPU needed to run sinusoidal modulation and Park/Clarke transforms, plus a 12-bit 1 Msps ADC capable of sampling two or three shunt currents synchronously with the PWM. The DMA controller moves ADC samples into RAM with zero core overhead, freeing the FPU for the control math. Designers targeting home appliances and small industrial pumps can stay inside one IC, one gate driver, and one IGBT/SiC inverter without external DSP or FPGA assistance.
Recommended
Automotive Body and Network Bridge
While the ATSAME51J20A-MU is industrial grade (-40 °C to +85 °C), the same 64-VQFN pinout maps to the AEC-Q100 automotive equivalent ATSAME51J20A-AUT, enabling a single hardware layout to be reused for both industrial and automotive SKUs. The integrated CAN-FD controller supports modern vehicle network architectures, the SERCOM peripherals can drive LIN or UART-based body controllers, and the hardware crypto accelerator protects secure firmware updates over CAN. Designers building vehicle-to-EV-charger gateways or telematics control units commonly select this part for the bridge role between CAN-FD and an external LTE/5G modem.
Recommended
Recommended Products Summary
Engineering reference data for ATSAME51J20A-MU — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAME51J19A-MU | ATSAME51J18A-MU | ATSAMD51J20A-MU | ATSAME53J20A-MU |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-VQFN (9x9 mm) EP | 64-VQFN (9x9 mm) EP - same | 64-VQFN (9x9 mm) EP - same | 64-VQFN (9x9 mm) EP - same | 64-VQFN (9x9 mm) EP - same |
| Core | Cortex-M4F 120 MHz | Cortex-M4F 120 MHz - same | Cortex-M4F 120 MHz - same | Cortex-M4F 120 MHz - same | Cortex-M4F 120 MHz - same |
| Flash | 1 MB | 512 KB (-50%) | 256 KB (-75%) | 1 MB (same) | 1 MB (same) |
| SRAM | 256 KB | 192 KB (-25%) | 128 KB (-50%) | 256 KB (same) | 256 KB (same) |
| CAN-FD | Yes (1x) | Yes (1x) | Yes (1x) | No | Yes (1x) |
| Ethernet | No | No | No | No | 10/100 MAC with PTP |
| Crypto Accelerator | AES-256/SHA-2/TRNG | AES-256/SHA-2/TRNG | AES-256/SHA-2/TRNG | AES-256/SHA-2/TRNG | AES-256/SHA-2/TRNG |
| USB 2.0 FS | Yes (Device/Host) | Yes (Device/Host) | Yes (Device/Host) | Yes (Device/Host) | Yes (Device/Host) |
| Single-piece Price (USD) | 7.42 | 6.30 (-15%) | 5.60 (-25%) | 7.10 (-4%) | 8.20 (+11%) |
Key Differentiators
- Highest-density Flash in the SAM E51 64-VQFN family (vs ATSAME51J19A-MU)
- On-chip CAN-FD controller plus integrated crypto accelerator (vs ATSAMD51J20A-MU)
- Balanced USB + CAN-FD in one footprint (vs ATSAME53J20A-MU)
Design Notes
Estimated: at 120 MHz full-load the ATSAME51J20A-MU draws approximately 18 mA from VDDIN (1.71-3.6 V). Place one 100 nF X7R 0402 capacitor plus one 10 µF X5R 0805 ceramic bulk capacitor on each VDDIO pin (pins 9, 23, 62) and a separate 4.7 µF bulk on VDDIN (pin 37) within 3 mm of the pads. Add a ferrite bead on VDDIN if the upstream 3.3 V LDO cannot guarantee <50 mV ripple at 120 MHz to avoid VDDIO glitch-induced brown-outs.
The 64-VQFN exposed thermal pad (pin 65) is the primary heat path. Stitch the EP to the inner ground plane with a 3x3 array of 0.3 mm thermal vias (9 vias minimum) to keep theta-JA below 28 °C/W. Estimated: at 18 mA × 3.3 V the part dissipates 0.06 W, well below thermal limits, but at 120 MHz + active ADC + crypto the realistic worst case approaches 0.25 W and the EP becomes the limiting heat path - skipping the thermal vias causes the die to run 8-10 °C hotter in still air.
Keep the SWD signals SWDIO and SWCLK (shared with PB10/PB11 on many footprints) routed as a 2-wire bus with no stubs and a total length under 50 mm. Place the 32.768 kHz crystal within 5 mm of the XIN32/XOUT32 pins, with the crystal load capacitors grounded to the same ground island as the MCU EP. High-speed SERCOM SPI traces should be length-matched within 5 mm when running above 25 MHz and routed over a continuous ground reference plane to avoid signal-integrity issues.
Do not leave unused GPIO as floating inputs; configure unused pins as output-low or enable the internal pull-down to avoid leakage from injection currents during board bring-up. When migrating from the SAM D51 ATSAMD51J20A-MU, double-check the CAN-FD peripheral is available - the SAM D51 has no CAN-FD controller and any firmware references to the CAN peripheral must be removed. The boot loader pin (BOOT) must be pulled high at reset to enter the ROM bootloader or low for normal Flash boot; leaving it floating causes unpredictable boot behavior on some boards.
Compliance Information
RoHS and REACH compliance confirmed per Microchip product page. Industrial -40 to +85 °C temperature grade; the automotive AEC-Q100 equivalent is the ATSAME51J20A-AUT variant in the same package.
