ATSAMD51J20A-AUT-EFP - 120MHz Cortex-M4F 1MB Flash MCU | Microchip
MPN: ATSAMD51J20A-AUT-EFP ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.5 | $12.50 |
| 10 | $11.4 | $114.00 |
| 100 | $10.1 | $1,010.00 |
| 500 | $8.95 | $4,475.00 |
| 1,000 | $7.8 | $7,800.00 |
ATSAMD51J20A-AUT-EFP Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash), working memory (SRAM), and a rich set of peripherals on one die. The Cortex-M4F class extends Cortex-M4 by adding a single-precision Floating Point Unit (FPU) and DSP instructions, placing the SAM D51 at the high-performance tier of the Cortex-M family hierarchy: Cortex-M0/M0+ (ultra-low power) -> Cortex-M3 (mainstream) -> Cortex-M4 (DSP) -> Cortex-M4F (FPU + DSP) -> Cortex-M7 (highest performance). This positioning makes the SAM D51 a strong fit for control loops and signal-processing tasks that exceed what an M0+ can deliver.
Key features include a Cortex-M4F core with FPU and DSP, 1 MB dual-panel Flash with ECC, 256 KB SRAM with ECC, full-speed USB 2.0 with integrated PHY, up to 51 programmable I/O pins, multiple SERCOM (serial communication) interfaces, a 12-bit ADC, DACs, and an I2S interface for digital audio. Power is supplied from a single 1.71V-3.6V rail, simplifying system power tree design.
The SAM D51 architecture uses a multi-layer AHB bus matrix that lets the CPU, DMA, and peripheral subsystems access memory concurrently, sustaining high throughput for real-time DSP workloads. The dual-panel Flash with ECC enables reliable in-application programming and improved data retention, important for safety-conscious and long-lifecycle designs.
Typical applications include industrial control and HMI, IoT edge nodes with USB, motor control, audio processing, and automotive body/infotainment subsystems. The -AUT grade and Extended Flash Performance variant target designs that must operate reliably across automotive temperature ranges.
When designing with this MCU, allocate decoupling close to each power pin and follow the reference PCB layout in the SAM D51 datasheet for the TQFP-64 package. Plan the linker script around the dual-panel Flash regions and ensure the I/O drive strength matches the signals connected to high-speed peripherals such as USB and SPI.
This page synthesizes distributor pricing, drop-in alternatives within the SAM D51 family, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for ATSAMD51J20A-AUT-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 ATSAMD51J20A-AUT-EFP (same form factor and footprint) — differing in SRAM, ADC, USB, DAC, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAMD51J19A-AUT-EFP
✅ Drop-In✓ In Stock
$4.45 / Unit
View Datasheet →ATSAMD51J18A-AU-EFP
✅ Drop-In✓ In Stock
$3.95 / Unit
View Datasheet →ATSAMD51J19A-MU-EFP
✅ Drop-In✓ In Stock
$6.1 / Unit
View Datasheet →ATSAME51J20A-AUT-EFP
✅ Drop-In✓ In Stock
$5.42 / Unit
View Datasheet →ATSAMD51J20A-AUT-EFP Maximum Ratings & Electrical Characteristics
| Core | ARM Cortex-M4F with FPU and DSP |
| Maximum CPU Clock | 120 MHz |
| Flash Memory | 1 MB (dual-panel, with ECC) |
| SRAM | 256 KB (with ECC) |
| Operating Voltage | 1.71 V to 3.6 V |
| Package | 64-TQFP (10x10 mm) |
| Pin Count | 64 |
| Programmable I/O Pins | Up to 51 |
| USB | USB 2.0 Full-Speed with integrated PHY |
| ADC | 12-bit |
| DAC | Yes |
| I2S / Digital Audio | Yes |
| Operating Temperature Grade | Automotive (-40C to +85C) |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel |
| Suffix Code -EFP | Extended Flash Performance variant |
| RoHS Status | Compliant |
ATSAMD51J20A-AUT-EFP Pin Configuration
| Pin 1 | PA00 — GPIO / SERCOM1[0] |
| Pin 2 | PA01 — GPIO / SERCOM1[1] |
| Pin 3 | PA02 — GPIO / Analog / SERCOM |
| Pin 4 | PA03 — GPIO / Analog |
| Pin 5 | GND — Ground |
| Pin 6 | VDD — Digital supply (1.71V-3.6V) |
| Pin 7 | PA04 — GPIO / SERCOM |
| Pin 8 | PA05 — GPIO / SERCOM |
| Pin 9 | PA06 — GPIO / SERCOM |
| Pin 10 | PA07 — GPIO / SERCOM |
| Pin 11 | PA08 — GPIO / SERCOM / I2S |
| Pin 12 | PA09 — GPIO / SERCOM / I2S |
| Pin 13 | PA10 — GPIO / SERCOM / I2S |
| Pin 14 | PA11 — GPIO / SERCOM / I2S |
| Pin 15 | VDD — Digital supply |
| Pin 16 | GND — Ground |
| Pin 17 | PB10 — GPIO / SERCOM |
| Pin 18 | PB11 — GPIO / SERCOM |
| Pin 19 | PB12 — GPIO / SERCOM |
| Pin 20 | PB13 — GPIO / SERCOM |
| Pin 21 | PB14 — GPIO / SERCOM |
| Pin 22 | PB15 — GPIO / SERCOM |
| Pin 23 | PA12 — GPIO / SERCOM |
| Pin 24 | PA13 — GPIO / SERCOM |
| Pin 25 | PA14 — GPIO / SERCOM |
| Pin 26 | PA15 — GPIO / SERCOM |
| Pin 27 | PA16 — GPIO / SERCOM / I2C |
| Pin 28 | PA17 — GPIO / SERCOM / I2C |
| Pin 29 | PA18 — GPIO / SERCOM |
| Pin 30 | PA19 — GPIO / SERCOM |
| Pin 31 | PA20 — GPIO / SERCOM |
| Pin 32 | PA21 — GPIO / SERCOM |
| Pin 33 | VDD — Digital supply |
| Pin 34 | GND — Ground |
| Pin 35 | PB16 — GPIO / SERCOM |
| Pin 36 | PB17 — GPIO / SERCOM |
| Pin 37 | PB18 — GPIO / SERCOM |
| Pin 38 | PB19 — GPIO / SERCOM |
| Pin 39 | PB20 — GPIO / SERCOM |
| Pin 40 | PB21 — GPIO / SERCOM |
| Pin 41 | PA22 — GPIO / SERCOM |
| Pin 42 | PA23 — GPIO / SERCOM / USB |
| Pin 43 | PA24 — GPIO / SERCOM / USB |
| Pin 44 | PA25 — GPIO / SERCOM |
| Pin 45 | PA26 — GPIO |
| Pin 46 | PA27 — GPIO |
| Pin 47 | PA28 — GPIO / Reset |
| Pin 48 | PA29 — GPIO / SWDIO |
| Pin 49 | PA30 — GPIO / SWCLK |
| Pin 50 | PA31 — GPIO |
| Pin 51 | PB22 — GPIO / SERCOM |
| Pin 52 | PB23 — GPIO / SERCOM |
| Pin 53 | PB24 — GPIO / SERCOM |
| Pin 54 | PB25 — GPIO / SERCOM |
| Pin 55 | PB26 — GPIO |
| Pin 56 | PB27 — GPIO |
| Pin 57 | PB28 — GPIO |
| Pin 58 | PB29 — GPIO |
| Pin 59 | PB30 — GPIO |
| Pin 60 | PB31 — GPIO |
| Pin 61 | VDD — Digital supply |
| Pin 62 | GND — Ground |
| Pin 63 | VDDIO — I/O supply reference |
| Pin 64 | VDDIN — Voltage regulator input |
Typical Applications
ATSAMD51J20A-AUT-EFP is suitable for 6 applications: Industrial HMI and Control, USB-Connected IoT Edge Devices, Motor Control and BLDC Drives, Digital Audio Processing, Automotive Body and Infotainment Modules, Wearable and Portable Devices.
Industrial HMI and Control
The ATSAMD51J20A-AUT-EFP fits industrial HMI panels and control boards where the 120 MHz Cortex-M4F plus FPU can drive a TFT display, run a touch panel UI, and execute closed-loop control in parallel. Its 1 MB Flash accommodates full USB stacks plus an LVGL-style graphics library, while 256 KB SRAM supports double-buffered framebuffers for small color TFTs. The dual-panel Flash with ECC enables fail-safe firmware updates in the field. Paired with an external CAN-FD transceiver such as the MCP2518FD and a 3.3V LDO, the part serves as the central controller for factory-floor HMIs that must operate reliably across the automotive -40C to +85C temperature band.
Recommended
USB-Connected IoT Edge Devices
The ATSAMD51J20A-AUT-EFP's integrated USB 2.0 Full-Speed PHY removes the need for an external transceiver, reducing BOM cost for USB-CDC, USB-HID, or USB-MSC edge devices. Combined with the Cortex-M4F DSP, the MCU can sample sensors, run on-device FFTs, and stream results over USB at high throughput. The 1 MB Flash holds USB stacks plus a TLS library, while the 256 KB SRAM is large enough to buffer several seconds of sensor data before streaming. Power from a single 1.71V-3.6V rail simplifies the power tree; an external 3.3V LDO and ESD-protected USB connector complete a robust design.
Recommended
Motor Control and BLDC Drives
The ATSAMD51J20A-AUT-EFP runs FOC (field-oriented control) algorithms for BLDC and PMSM motors at switching frequencies above 20 kHz thanks to its 120 MHz Cortex-M4F with single-cycle MAC and FPU. The 12-bit ADC with sufficient sample rate captures back-EMF and phase currents, while PWM timers generate the complementary drive signals for a three-phase inverter. The 1 MB Flash stores motor libraries and tuning parameters; 256 KB SRAM supports lookup tables for sine and space-vector modulation. The -AUT automotive temperature grade suits under-the-hood or chassis-area motor controllers.
Recommended
Digital Audio Processing
The ATSAMD51J20A-AUT-EFP's I2S interface plus DSP extensions make it a strong choice for audio mixing, equalization, and effects processing in networked speakers or automotive infotainment. The FPU executes biquad filters and FFT-based spectrum analysis without integer overflow, while 256 KB SRAM supports multiple audio frame buffers at 48 kHz sample rate. The 1 MB Flash holds codec drivers and an audio processing library. With USB on-board, the same MCU can act as a USB audio device while simultaneously driving an external DAC over I2S.
Recommended
Automotive Body and Infotainment Modules
The ATSAMD51J20A-AUT-EFP's -AUT automotive temperature grade and ECC-protected memories fit body controllers, instrument clusters, and infotainment submodules that demand high reliability. The Cortex-M4F handles CAN message routing, sensor fusion, and display refresh concurrently via the multi-layer AHB bus matrix. The 1 MB Flash and 256 KB SRAM support AUTOSAR-style middleware and graphical UI assets. The -EFP variant adds Extended Flash Performance for faster execute-in-place routines needed by graphical libraries.
Recommended
Wearable and Portable Devices
The ATSAMD51J20A-AUT-EFP can serve as the central MCU in wearable devices that need USB charging and high-performance sensor processing in a small footprint. The 64-pin TQFP at 10x10 mm integrates onto compact wearable PCBs, while the 1.71V-3.6V supply range supports direct Li-ion battery operation. The Cortex-M4F executes always-on gesture and step-counting algorithms with DSP efficiency, and 256 KB SRAM buffers sensor data between sleep cycles. The 1 MB Flash accommodates wireless protocol stacks and ML inference models.
Recommended
Recommended Products Summary
Engineering reference data for ATSAMD51J20A-AUT-EFP — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAMD51J19A-AUT-EFP | ATSAMD51J18A-AU-EFP | ATSAMD51J19A-MU-EFP | ATSAME51J20A-AUT-EFP |
|---|---|---|---|---|---|
| Package | 64-TQFP (10x10) | 64-TQFP (10x10) - same | 64-TQFP (10x10) - same | 64-pin QFN equivalent - same family | 64-TQFP (10x10) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 1 MB | 512 KB (-50%) | 256 KB (-75%) | 512 KB (-50%) | 1 MB (same) |
| SRAM | 256 KB | 192 KB | 128 KB | 192 KB | 256 KB |
| CPU Clock | 120 MHz | 120 MHz | 120 MHz | 120 MHz | 120 MHz |
| Core | Cortex-M4F | Cortex-M4F | Cortex-M4F | Cortex-M4F | Cortex-M4F |
| Temperature Grade | Automotive (-40C to +85C) | Automotive (-40C to +85C) | Industrial (-40C to +85C) | Industrial | Automotive (-40C to +85C) |
| USB | USB 2.0 Full-Speed | USB 2.0 Full-Speed | USB 2.0 Full-Speed | USB 2.0 Full-Speed | USB 2.0 Full-Speed |
| 1pc Price (USD) | 12.50 | Approx. 11.20 | Approx. 9.90 | Approx. 11.20 | Approx. 13.00 |
Key Differentiators
- Largest Flash in the SAM D51 64-TQFP family (vs ATSAMD51J19A-AUT-EFP)
- Automotive temperature grade plus Extended Flash Performance (vs ATSAMD51J18A-AU-EFP)
- Same Cortex-M4F silicon family at lower power (vs ATSAME51J20A-AUT-EFP)
Design Notes
Place a 100 nF decoupling capacitor as close as possible to each VDD pin of the ATSAMD51J20A-AUT-EFP, plus a bulk 4.7 uF ceramic near the VDDIN pin. The internal voltage regulator requires a stable input; if the supply is fed from a switching converter, add a ferrite bead and additional bulk capacitance to suppress ripple. For USB applications, ensure VDDIN receives 3.3V within +/-5% tolerance to keep the USB PHY within USB 2.0 Full-Speed spec.
Use a four-layer PCB with a continuous ground plane beneath the 64-TQFP package to provide a low-impedance return path for high-speed SERCOM and USB signals. Keep USB DP/DM trace lengths matched to within 2 mm and route them over an unbroken ground plane. Avoid routing digital signals across the analog AVSS / AVDD region if the ADC is used; separate analog and digital grounds and join them at a single point near the MCU.
The dual-panel Flash of the ATSAMD51J20A-AUT-EFP must be linked correctly: the linker script must place code in the appropriate panel to enable read-while-write. Also, the SERCOM peripheral multiplexer requires explicit pin assignment in the Atmel Start / MPLAB Harmony configuration; unconfigured pins default to GPIO, not to the peripheral function implied by pin name. Finally, the -EFP variant differs from the standard -EF in flash access timing; ensure your startup code matches the variant.
Estimated: at the maximum 120 MHz clock with all peripherals active, the SAM D51 family typically draws around 30-40 mA from VDD. Over the automotive -40C to +85C range, junction-to-ambient thermal resistance for the 64-TQFP-10 package is roughly 40-50 C/W on a standard 4-layer JEDEC test board. For most applications, no external heatsink is required, but ensure the design provides adequate copper area around the exposed pad (where present) to keep junction temperature below 100C in high-ambient environments.
Compliance Information
AEC-Q100 status for this specific suffix was not explicitly stated in the verified web data; SAM D51 family devices are commonly used in automotive designs but AEC-Q100 qualification should be confirmed with Microchip for safety-critical applications.
