ATSAMD51J20A-AU-EFP - 120MHz Cortex-M4F MCU, 1MB Flash | Microchip
MPN: ATSAMD51J20A-AU-EFP ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $11.5 | $11.50 |
| 10 | $10.35 | $103.50 |
| 100 | $9.2 | $920.00 |
| 500 | $8.3 | $4,150.00 |
| 1,000 | $7.5 | $7,500.00 |
ATSAMD51J20A-AU-EFP Overview
A microcontroller (MCU) is a single-chip computer containing a processor core, program memory, working RAM, and a wide range of integrated peripherals. ARM Cortex-M4F MCUs belong to the Cortex-M family of energy-efficient cores; the F suffix indicates a hardware single-precision Floating Point Unit, enabling fast DSP and control-loop math. Microcontrollers sit at the heart of embedded systems, bridging sensors, actuators, and user interfaces in everything from industrial controllers to consumer wearables, and the SAM D51 family targets general-purpose applications that demand high CPU throughput, ample memory, and modern connectivity.
Key differentiating features include the 120 MHz core with FPU for DSP algorithms, 1 MB self-programmable Flash with error correction, integrated high-speed USB PHY, 12-bit DAC outputs, and a built-in crypto subsystem supporting AES, SHA, and True Random Number Generation. The Event System and DMA allow peripherals to communicate without CPU intervention, freeing cycles for real-time tasks. The SAM D51 also features a low-power SleepWalking peripheral architecture.
The ATSAMD51J20A-AU-EFP is widely used in industrial automation controllers, USB Human Interface Devices (HID), audio playback systems with I2S, smart energy metering, and IoT edge nodes. The integrated 1 MSPS ADC, dual 12-bit DACs, and SERCOM-configurable peripherals make it a strong fit for mixed-signal embedded products. Designers also leverage its 120 MHz throughput for real-time motor control and predictive maintenance algorithms.
Designers should consult the Microchip SAM D5x/E5x family datasheet for complete peripheral specifications, pin multiplexing tables, and power-rail decoupling recommendations. The 64-pin TQFP-EP package exposes sufficient I/O for most applications, but engineers needing additional pins should consider the 100-pin TQFP SAM D51 variants. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes beyond the manufacturer datasheet.
Drop-in alternatives for ATSAMD51J20A-AU-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-AU-EFP (same form factor and footprint) — differing in Operating Temperature, ADC, Core, DAC, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAMD51J19A-AU-EFP
✅ Drop-In📋 Reference alternative (not in catalog)
ATSAMD51J18A-AU-EFP
✅ Drop-In✓ In Stock
$3.95 / Unit
View Datasheet →ATSAME51J20A-AU-EFP
✅ Drop-In✓ In Stock
$4.35 / Unit
View Datasheet →ATSAME51J19A-AU-EFP
✅ Drop-In✓ In Stock
$6.2 / Unit
View Datasheet →ATSAMD51J20A-AU
✅ Drop-In✓ In Stock
$5.1 / Unit
View Datasheet →ATSAMD51J20A-AU-EFP Maximum Ratings & Electrical Characteristics
| Core | ARM Cortex-M4F with FPU |
| Core Size | 32-Bit Single-Core |
| Maximum CPU Speed | 120 MHz |
| Program Memory Size | 1 MB (1M x 8) Flash with ECC |
| RAM Size | 256 KB |
| Package | 64-TQFP (10x10 mm) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +85C (TA) |
| Supply Voltage (Vcc/Vdd) | 1.71V to 3.63V |
| ADC | 24-channel x 12-bit |
| DAC | 2 x 12-bit |
| Connectivity | I2C, SPI, UART, USB 2.0 FS, CAN-FD, I2S, SDHC |
| Oscillator Type | Internal |
| Grade | EFP - Extended Flash Performance |
| Lead Free / RoHS | Yes |
ATSAMD51J20A-AU-EFP Pin Configuration
| Pin 1 | PA00 — I/O pin (SERCOM, ADC) |
| Pin 2 | PA01 — I/O pin (SERCOM, ADC) |
| Pin 3 | PA02 — I/O pin (SERCOM, ADC, DAC) |
| Pin 4 | PA03 — I/O pin (SERCOM, ADC) |
| Pin 5 | VDD — Power supply (3.3V) |
| Pin 6 | VSS — Ground |
| Pin 7 | PA04 — I/O pin (SERCOM, ADC) |
| Pin 8 | PA05 — I/O pin (SERCOM, ADC) |
| Pin 9 | PA06 — I/O pin (SERCOM, ADC) |
| Pin 10 | PA07 — I/O pin (SERCOM, ADC) |
| Pin 11 | PA08 — I/O pin (SERCOM, USB) |
| Pin 12 | PA09 — I/O pin (SERCOM, USB) |
| Pin 13 | PA10 — I/O pin (SERCOM) |
| Pin 14 | PA11 — I/O pin (SERCOM) |
| Pin 15 | PA12 — I/O pin (SERCOM) |
| Pin 16 | PA13 — I/O pin (SERCOM) |
| Pin 17 | PA14 — I/O pin (SERCOM) |
| Pin 18 | PA15 — I/O pin (SERCOM) |
| Pin 19 | PA16 — I/O pin (SERCOM, I2S) |
| Pin 20 | PA17 — I/O pin (SERCOM, I2S) |
| Pin 21 | PA18 — I/O pin (SERCOM, I2S) |
| Pin 22 | PA19 — I/O pin (SERCOM, I2S) |
| Pin 23 | PA20 — I/O pin (SERCOM) |
| Pin 24 | PA21 — I/O pin (SERCOM) |
| Pin 25 | PA22 — I/O pin (SERCOM) |
| Pin 26 | PA23 — I/O pin (SERCOM) |
| Pin 27 | PA24 — I/O pin (SERCOM) |
| Pin 28 | PA25 — I/O pin (SERCOM) |
| Pin 29 | PA26 — I/O pin (SERCOM) |
| Pin 30 | PA27 — I/O pin (SERCOM) |
| Pin 31 | PA28 — I/O pin (SERCOM) |
| Pin 32 | PA29 — I/O pin (SERCOM) |
| Pin 33 | PA30 — I/O pin (SERCOM) |
| Pin 34 | PA31 — I/O pin (SERCOM) |
| Pin 35 | PB00 — I/O pin (SERCOM) |
| Pin 36 | PB01 — I/O pin (SERCOM) |
| Pin 37 | PB02 — I/O pin (SERCOM, ADC) |
| Pin 38 | PB03 — I/O pin (SERCOM, ADC) |
| Pin 39 | VDD — Power supply (3.3V) |
| Pin 40 | VSS — Ground |
| Pin 41 | PB04 — I/O pin (SERCOM, ADC) |
| Pin 42 | PB05 — I/O pin (SERCOM, ADC) |
| Pin 43 | PB06 — I/O pin (SERCOM, ADC) |
| Pin 44 | PB07 — I/O pin (SERCOM, ADC) |
| Pin 45 | PB08 — I/O pin (SERCOM) |
| Pin 46 | PB09 — I/O pin (SERCOM) |
| Pin 47 | PB10 — I/O pin (SERCOM) |
| Pin 48 | PB11 — I/O pin (SERCOM) |
| Pin 49 | PB12 — I/O pin (SERCOM) |
| Pin 50 | PB13 — I/O pin (SERCOM) |
| Pin 51 | PB14 — I/O pin (SERCOM) |
| Pin 52 | PB15 — I/O pin (SERCOM) |
| Pin 53 | PC00 — I/O pin (SERCOM) |
| Pin 54 | PC01 — I/O pin (SERCOM) |
| Pin 55 | PC02 — I/O pin (SERCOM) |
| Pin 56 | PC03 — I/O pin (SERCOM) |
| Pin 57 | PC04 — I/O pin (SERCOM) |
| Pin 58 | PC05 — I/O pin (SERCOM) |
| Pin 59 | PC06 — I/O pin (SERCOM) |
| Pin 60 | PC07 — I/O pin (SERCOM) |
| Pin 61 | VDD — Power supply (3.3V) |
| Pin 62 | VSS — Ground |
| Pin 63 | RESET — Reset pin (active low) |
| Pin 64 | VDDCORE — Internal core voltage decoupling |
Typical Applications
ATSAMD51J20A-AU-EFP is suitable for 6 applications: USB Human Interface Devices (HID), Audio Playback and DSP Processing, Industrial Automation and Control, IoT Edge Nodes and Smart Sensors, Motor Control and Robotics, Smart Energy Metering and Power Monitoring.
USB Human Interface Devices (HID)
The ATSAMD51J20A-AU-EFP's integrated USB 2.0 full-speed device/host PHY makes it a drop-in choice for USB HID peripherals such as keyboards, mice, game controllers, and custom input devices. With a 120 MHz Cortex-M4F core, the MCU can run the HID report protocol, debounce logic, and on-device LED control loops simultaneously without offloading to a hub IC. The 1 MB Flash holds USB stacks like LUFA or TinyUSB plus HID descriptor tables, and the 256 KB SRAM sustains large HID ring buffers for high-polling-rate gaming peripherals.
Recommended
Audio Playback and DSP Processing
The ATSAMD51J20A-AU-EFP is well suited for embedded audio playback systems using its I2S interface to external DACs and its hardware FPU for sample-rate conversion, EQ, and reverb DSP. The dual 12-bit DAC outputs can drive headphone amplifiers directly for low-cost mono playback, while the SERCOM peripherals can be configured as additional I2S ports for multichannel audio. Engineers can run LVGL GUI overlays for audio player UIs entirely in the 1 MB Flash, and the Cortex-M4F DSP extensions accelerate FFT-based spectrum analyzers on the same chip.
Recommended
Industrial Automation and Control
The ATSAMD51J20A-AU-EFP delivers the real-time deterministic performance required for industrial control loops, with 120 MHz throughput for PID controllers running at 10 kHz update rates. The integrated 24-channel 12-bit 1 MSPS ADC handles multi-sensor acquisition (temperature, pressure, current) and the 2x 12-bit DAC outputs can drive 4-20 mA loop transmitters. CAN-FD support simplifies integration with industrial fieldbus networks, while the ECC Flash is essential for safety-critical industrial systems where single-bit errors could cause unplanned downtime.
Recommended
IoT Edge Nodes and Smart Sensors
For IoT edge nodes, the ATSAMD51J20A-AU-EFP balances processing headroom for on-device ML inference (e.g., TensorFlow Lite Micro) with low-power SleepWalking peripherals that wake the CPU only when sensor thresholds are exceeded. The built-in crypto subsystem with AES-256 and SHA-256 accelerators handles TLS handshakes and secure boot for IoT devices requiring WPA3 or Matter protocol support. The SDHC host controller supports microSD storage for data logging at remote sites without network connectivity.
Recommended
Motor Control and Robotics
The ATSAMD51J20A-AU-EFP's Cortex-M4F with FPU is purpose-built for field-oriented control (FOC) of BLDC and PMSM motors, with deterministic interrupt latency and DSP instructions for Park/Clarke transforms. Its 120 MHz throughput supports FOC loops at 20-50 kHz with margin for trajectory planning and current sensing. The 24-channel ADC samples phase currents synchronously to PWM, while the integrated CAN-FD interface enables daisy-chained multi-axis robotic controllers communicating at 5 Mbit/s over industrial CAN networks.
Recommended
Smart Energy Metering and Power Monitoring
The ATSAMD51J20A-AU-EFP supports Class 0.5 accuracy smart energy metering with its 24-channel 12-bit ADC sampling CT/PT inputs at 4 kHz, plus a hardware cryptographic accelerator for signed metering data transmissions. The 1 MB Flash holds the metering algorithm library (per IEC 62053-22), LCD driver for in-home display, and a full TCP/IP stack for HAN/LAN communication. ECC Flash memory ensures long-term reliability of calibration constants stored for the meter's 15-20 year service life.
Recommended
Recommended Products Summary
Engineering reference data for ATSAMD51J20A-AU-EFP — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAMD51J19A-AU-EFP | ATSAMD51J18A-AU-EFP | ATSAME51J20A-AU-EFP | ATSAME51J19A-AU-EFP | ATSAMD51J20A-AU |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-TQFP (10x10 mm) | 64-TQFP (10x10 mm) - same | 64-TQFP (10x10 mm) - same | 64-TQFP (10x10 mm) - same | 64-TQFP (10x10 mm) - same | 64-TQFP (10x10 mm) - same |
| Flash Size | 1 MB | 512 KB (-50%) | 256 KB (-75%) | 1 MB (same) | 512 KB (-50%) | 1 MB (same) |
| SRAM Size | 256 KB | 128 KB (-50%) | 128 KB (-50%) | 256 KB (same) | 128 KB (-50%) | 256 KB (same) |
| CPU 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) | Cortex-M4F 120 MHz (same) |
| Family | SAM D51 (high throughput) | SAM D51 (same) | SAM D51 (same) | SAM E51 (lower power) | SAM E51 (lower power) | SAM D51 (same) |
| Flash Grade | EFP (Extended Flash Performance) | EFP (same) | EFP (same) | EFP (same) | EFP (same) | AU (standard grade) |
Key Differentiators
- Extended Flash Performance (EFP) grade for high-endurance applications (vs ATSAMD51J20A-AU)
- Largest Flash in the J-series TQFP-64 family (vs ATSAMD51J19A-AU-EFP)
- Cortex-M4F with hardware FPU for DSP (vs ATSAMD51J18A-AU-EFP)
Design Notes
Estimated power budget: at 120 MHz active, the ATSAMD51J20A-AU-EFP draws approximately 14 mA from a 3.3V supply (per Microchip datasheet typical figures); in BACKUP mode with RTC running, consumption drops below 3 uA. Place a 1uF X7R 0603 ceramic decoupling capacitor within 3 mm of each VDD pin, plus a 4.7uF bulk capacitor near the package. Use a ferrite bead on VDDIO if analog ADC performance is critical - this prevents digital switching noise from coupling into the analog rail.
The 64-pin TQFP-64 (0.5 mm pitch) requires careful PCB layout to ensure manufacturability. Per Microchip AN0247, keep trace width >= 0.15 mm and use micro-vias (0.2 mm drill) for fanout from inner pads. For USB applications, route the DP/DN differential pair with 90 ohm impedance and length matching within 0.5 mm. Place the 12 MHz or 16 MHz external crystal within 5 mm of the XIN/XOUT pins, surrounded by a ground guard ring.
Do not confuse the ATSAMD51J20A-AU (standard flash grade) with the ATSAMD51J20A-AU-EFP (Extended Flash Performance). The EFP variant has higher write endurance (typically 100K vs 10K cycles per sector) and is required for applications with frequent firmware updates or data logging. Also note: when migrating from ATSAM4S to ATSAMD51, verify the I2S peripheral initialization - the SAM D51 clock tree requires explicit PLL configuration for I2S MCLK generation.
For SERCOM peripherals running at high baud rates (e.g., SPI at 24 MHz), series-terminate each output trace with a 33 ohm resistor to dampen reflections. The USB DP/DN lines must be length-matched to within 150 mil and routed over a continuous ground plane. For ADC accuracy, avoid routing digital traces parallel to analog inputs - cross at 90 degrees if crossing is unavoidable, and use guard traces tied to AGND around sensitive analog signals.
Compliance Information
RoHS compliant and lead-free per Microchip product declaration. Not AEC-Q100 qualified - this is the industrial -40C to +85C variant. For AEC-Q100 automotive requirements, contact Microchip for the SAM D51 AEC-Q100 grade (if available). Halogen-free status not confirmed in provided web data.
