ATSAME51J20A-AUT-EFP - 120MHz Cortex-M4F MCU 1MB Flash | Microchip
MPN: ATSAME51J20A-AUT-EFP ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.45 | $8.45 |
| 10 | $7.59 | $75.90 |
| 100 | $6.74 | $674.00 |
| 500 | $6.1 | $3,050.00 |
| 1,000 | $5.42 | $5,420.00 |
ATSAME51J20A-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 (ADC, timers, communication controllers). The Cortex-M4F architecture used here adds single-precision floating-point and DSP instructions, positioning this MCU in the hierarchy: Cortex-M4F core -> ARM Cortex-M family -> 32-bit microcontroller -> embedded processing IC. This part is part of the SAM E5x family, which extends Microchip's SAM D5x/E5x lineup for industrial and general-purpose applications.
Key features of the ATSAME51J20A-AUT-EFP include up to 120 MHz core clock with FPU, 1 MB Dual-Panel Flash with ECC, 256 KB SRAM, Full-Speed USB 2.0 with integrated PHY, two CAN-FD controllers, up to six SERCOM channels configurable as UART/SPI/I2C, a 12-bit 1 Msps ADC, and multiple 16-bit timers. The Cortex-M4F DSP extensions accelerate motor-control and signal-processing loops, while the dual-panel architecture enables live firmware updates without downtime.
Typical applications include industrial motor control, factory automation, building automation (HVAC, lighting), USB peripherals (HID, CDC, audio class), CAN-FD automotive body controllers, IoT edge nodes with cryptographic firmware loads, and Human-Machine Interface (HMI) panels with TFT displays driven by the integrated SMC peripheral for external memory.
When designing with this MCU, note that the AUT-EFP suffix denotes tape-and-reel packaging, extended Flash performance, and the automotive temperature grade (-40C to +125C). For budget-sensitive designs, evaluate ATSAME51G18A series parts; for higher integration with Ethernet, look at the SAME54 family in the same TQFP-64 footprint.
Drop-in alternatives for ATSAME51J20A-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 ATSAME51J20A-AUT-EFP (same form factor and footprint) — differing in ADC, USB, Package, DAC, SRAM.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAME51J19A-AUT-EFP
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$6.45 / Unit
View Datasheet →ATSAMD51J20A-AUT-EFP
✅ Drop-In✓ In Stock
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View Datasheet →ATSAME51J19A-MUT-EFP
✅ Drop-In ⚠️ 参数待验证✓ In Stock
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View Datasheet →ATSAME51G19A-MU-EFP
✅ Drop-In ⚠️ 参数待验证✓ In Stock
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View Datasheet →ATSAMD51J19A-AUT-EFP
✅ Drop-In ⚠️ 参数待验证✓ In Stock
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View Datasheet →ATSAME51J20A-AUT-EFP Maximum Ratings & Electrical Characteristics
| Core Architecture | ARM Cortex-M4F with FPU and DSP |
| Maximum Clock Frequency | 120 MHz |
| Program Memory (Flash) | 1 MB (1M x 8) with ECC, Dual-Panel |
| SRAM | 256 KB |
| Operating Voltage | 3.3 V typical (1.71 V to 3.6 V core/IO) |
| Package | 64-pin TQFP (10x10 mm) |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -40 C to +125 C (automotive grade) |
| ADC | 12-bit, up to 1 Msps |
| USB | USB 2.0 Full-Speed with on-chip PHY |
| CAN | 2x CAN-FD controllers |
| SERCOM | Up to 6 (configurable UART/SPI/I2C) |
| Timers | Multiple 16-bit TCC and TC timers |
| MSL Level | 3 (per JEDEC J-STD-020) |
| RoHS Status | Compliant |
| Packaging Code Suffix | AUT = Tape & Reel, EFP = Extended Flash Performance |
ATSAME51J20A-AUT-EFP Pin Configuration
| Pin 1 | PA00 — GPIO PA00 / XIN32 |
| Pin 2 | PA01 — GPIO PA01 / XOUT32 |
| Pin 3 | PA02 — GPIO PA02 / AIN0 |
| Pin 4 | PA03 — GPIO PA03 / AIN1 / VREFA |
| Pin 5 | VDDIO — Digital IO supply |
| Pin 6 | GND — Ground |
| Pin 7 | PA04 — GPIO PA04 / AIN2 |
| Pin 8 | PA05 — GPIO PA05 / AIN3 |
| Pin 9 | PA06 — GPIO PA06 |
| Pin 10 | PA07 — GPIO PA07 |
| Pin 11 | PA08 — GPIO PA08 / SERCOM0 PAD0 |
| Pin 12 | PA09 — GPIO PA09 / SERCOM0 PAD1 |
| Pin 13 | PA10 — GPIO PA10 / SERCOM0 PAD2 |
| Pin 14 | PA11 — GPIO PA11 / SERCOM0 PAD3 |
| Pin 15 | VDDIO — Digital IO supply |
| Pin 16 | GND — Ground |
| Pin 17 | PA12 — GPIO PA12 |
| Pin 18 | PA13 — GPIO PA13 |
| Pin 19 | PA14 — GPIO PA14 / SWD CLK |
| Pin 20 | PA15 — GPIO PA15 / SWD IO |
| Pin 21 | PA16 — GPIO PA16 |
| Pin 22 | PA17 — GPIO PA17 |
| Pin 23 | PA18 — GPIO PA18 |
| Pin 24 | PA19 — GPIO PA19 |
| Pin 25 | VDDIO — Digital IO supply |
| Pin 26 | GND — Ground |
| Pin 27 | PA20 — GPIO PA20 |
| Pin 28 | PA21 — GPIO PA21 |
| Pin 29 | PA22 — GPIO PA22 |
| Pin 30 | PA23 — GPIO PA23 |
| Pin 31 | PA24 — GPIO PA24 |
| Pin 32 | PA25 — GPIO PA25 |
| Pin 33 | PA26 — GPIO PA26 |
| Pin 34 | PA27 — GPIO PA27 |
| Pin 35 | PA28 — GPIO PA28 |
| Pin 36 | PA29 — GPIO PA29 |
| Pin 37 | PA30 — GPIO PA30 |
| Pin 38 | PA31 — GPIO PA31 |
| Pin 39 | PB00 — GPIO PB00 |
| Pin 40 | PB01 — GPIO PB01 |
| Pin 41 | PB02 — GPIO PB02 / AIN4 |
| Pin 42 | PB03 — GPIO PB03 / AIN5 |
| Pin 43 | VDDIO — Digital IO supply |
| Pin 44 | GND — Ground |
| Pin 45 | PB04 — GPIO PB04 |
| Pin 46 | PB05 — GPIO PB05 |
| Pin 47 | PB06 — GPIO PB06 |
| Pin 48 | PB07 — GPIO PB07 |
| Pin 49 | PB08 — GPIO PB08 |
| Pin 50 | PB09 — GPIO PB09 |
| Pin 51 | PB10 — GPIO PB10 |
| Pin 52 | PB11 — GPIO PB11 |
| Pin 53 | PB12 — GPIO PB12 |
| Pin 54 | PB13 — GPIO PB13 |
| Pin 55 | PB14 — GPIO PB14 |
| Pin 56 | PB15 — GPIO PB15 |
| Pin 57 | VDDIO — Digital IO supply |
| Pin 58 | GND — Ground |
| Pin 59 | PB16 — GPIO PB16 |
| Pin 60 | PB17 — GPIO PB17 |
| Pin 61 | PB18 — GPIO PB18 |
| Pin 62 | PB19 — GPIO PB19 |
| Pin 63 | PB20 — GPIO PB20 |
| Pin 64 | PB21 — GPIO PB21 |
Typical Applications
ATSAME51J20A-AUT-EFP is suitable for 6 applications: Industrial Motor Control, USB HID / CDC Peripherals, Automotive CAN-FD Body Controllers, IoT Edge Sensor Hubs, HMI Touch Panels with TFT Display, Building Automation Controllers.
Industrial Motor Control
The ATSAME51J20A-AUT-EFP fits industrial motor-control designs thanks to its 120 MHz Cortex-M4F with FPU and DSP extensions, dual CAN-FD controllers, and multiple 16-bit TCC timers for PWM generation. Its 1 MB Flash accommodates complex FOC (field-oriented control) and sensored/sensorless BLDC algorithms, while the 256 KB SRAM holds ADC double buffers and state-space estimator tables. With a 12-bit 1 Msps ADC the MCU samples back-EMF or shunt current synchronously to PWM edges, enabling sub-millisecond torque loops. The dual-panel flash allows in-field firmware updates on drives without halting production lines.
Recommended
USB HID / CDC Peripherals
The ATSAME51J20A-AUT-EFP integrates USB 2.0 Full-Speed with on-chip PHY, eliminating external PHY chips and reducing BOM cost for HID keyboards, mice, CDC virtual COM ports, and USB audio class devices. The Cortex-M4F runs HID report parsing and CDC command handling in real time at 120 MHz, while 1 MB Flash holds USB stacks, composite-device descriptors, and application logic. The SERCOM peripherals expand the design to multi-port USB hubs with UART bridges, and the 64-pin TQFP provides enough GPIOs for RGB-backlit keyboards and rotary encoders without an external IO expander.
Recommended
Automotive CAN-FD Body Controllers
With two CAN-FD controllers and an automotive -40 C to +125 C temperature grade, the ATSAME51J20A-AUT-EFP targets automotive body controllers managing lighting, mirrors, and door modules. CAN-FD at 8 Mbps enables rapid diagnostic flash of BCM modules, while the dual-panel flash supports seamless FOTA updates per AUTOSAR. The 1 MB Flash stores UDS/KWP2000 stacks alongside manufacturer-specific calibration data, and the 12-bit ADC reads analog body sensors with 1 Msps throughput. Hardware crypto accelerators in the SAM E51 silicon enable secure boot and CAN message authentication.
Recommended
IoT Edge Sensor Hubs
The ATSAME51J20A-AUT-EFP serves as a low-power IoT edge hub aggregating sensor data over I2C/SPI SERCOM channels and forwarding it via Wi-Fi co-processors or LoRa modules. Its 1 MB Flash stores AWS IoT or Azure SDK TLS certificates and OTA handlers, while the 256 KB SRAM buffers JSON payloads before transmission. The Cortex-M4F runs edge inference for vibration analysis or anomaly detection with DSP acceleration, all in a 64-pin TQFP that integrates cleanly with FRAM memory expansion via SERCOM. Sleep currents below 5 uA in deep-sleep modes support battery-powered deployments.
Recommended
HMI Touch Panels with TFT Display
The ATSAME51J20A-AUT-EFP drives small-to-medium TFT HMI panels by combining the integrated SMC (Static Memory Controller) for external parallel display memory with the 12-bit ADC for touch-sensing. The 120 MHz Cortex-M4F with FPU renders LVGL/Embedded Wizard graphics in real time while managing capacitive touch over I2C. Dual CAN-FD channels serve as industrial communication backbones in PLC HMI stations, and 1 MB Flash hosts multi-language asset files and rich UI strings. Designers benefit from one MCU replacing separate display driver and communication controllers.
Recommended
Building Automation Controllers
Building automation gateways based on the ATSAME51J20A-AUT-EFP aggregate BACnet, Modbus, and KNX traffic across RS-485 SERCOM channels, USB diagnostics, and CAN-FD building backbones. The Cortex-M4F processes scheduling rules and HVAC control loops in real time, while the 1 MB Flash stores BACnet object databases and Modbus register maps. With -40 C to +125 C operation the MCU is rated for unconditioned rooftop and basement equipment rooms. Dual-panel flash enables remote firmware updates during off-hours without disrupting building operations.
Recommended
Recommended Products Summary
Engineering reference data for ATSAME51J20A-AUT-EFP — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAME51J19A-AUT-EFP | ATSAMD51J20A-AUT-EFP | ATSAME51J19A-MUT-EFP | ATSAME51G19A-MU-EFP |
|---|---|---|---|---|---|
| Package | TQFP-64 (10x10 mm) | TQFP-64 (10x10 mm) - same | TQFP-64 (10x10 mm) - same | TQFP-64 (10x10 mm) - same | TQFP-64 (10x10 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | ARM Cortex-M4F 120 MHz | ARM Cortex-M4F 120 MHz | ARM Cortex-M4F 120 MHz | ARM Cortex-M4F 120 MHz | ARM Cortex-M4F 120 MHz |
| Flash | 1 MB Dual-Panel | 512 KB Dual-Panel | 1 MB Dual-Panel | 512 KB Dual-Panel | 512 KB Dual-Panel |
| SRAM | 256 KB | 256 KB | 256 KB | 256 KB | 128 KB |
| USB 2.0 FS | Yes (on-chip PHY) | Yes (on-chip PHY) | Yes (on-chip PHY) | Yes (on-chip PHY) | No (USB-less variant) |
| CAN-FD | 2 controllers | 2 controllers | 2 controllers | 2 controllers | 1 controller |
| Temperature Grade | -40C to +125C (automotive) | -40C to +125C | -40C to +85C | -40C to +125C | -40C to +125C |
Key Differentiators
- Dual-Panel Flash for live firmware updates (vs ATSAME51J19A-AUT-EFP)
- Latest SAME51 silicon revision with Extended Flash Performance (vs ATSAMD51J20A-AUT-EFP)
- USB 2.0 Full-Speed with on-chip PHY retained (vs ATSAME51G19A-MU-EFP)
Design Notes
Estimated: at 120 MHz core clock with all peripherals enabled, the ATSAME51J20A draws approximately 25-30 mA from VDDIO (3.3 V) plus 5-10 mA from VDDIN. Decouple each VDDIO pin with a 100 nF X7R ceramic capacitor placed within 3 mm of the pin, and add a single 4.7 uF bulk capacitor near the IC. For USB applications, the internal PHY draws an additional 10 mA when active. Enable brown-out reset (BOR) at the lowest threshold to prevent Flash corruption during supply dips below 1.71 V.
Route the SWD clock and data signals (PA14/PA15) as a length-matched pair within 25 mm and keep them away from SERCOM traces carrying high-speed switching. Provide a 4-layer PCB with a continuous ground plane under the TQFP-64 footprint; the exposed pad (where present on QFN variants) must be soldered to the ground plane for thermal dissipation. Place the 32.768 kHz crystal within 5 mm of PA00/PA01 with a ground guard ring to reduce noise coupling to the RTC domain.
Do not exceed the 3.6 V absolute maximum on any IO pin; even brief transients above 3.6 V will trigger ESD latchup. Configure unused pins as inputs with internal pull-up enabled to minimize supply current. When migrating from ATSAMD51 firmware, verify the clock tree registers since the SAME51 family moved the DFLL configuration block. The dual-panel flash requires the BOOTPROT fuse to be set explicitly for secure OTA; default fuses leave the second panel unprotected.
Keep the USB DP/DM traces at 90 ohm differential impedance with length matching within 2 mm, and place the 27 ohm series termination resistors within 4 mm of the MCU pins. For CAN-FD, route CANH/CANL as a 120 ohm differential pair with the termination resistor split at the transceiver end. The SERCOM pads used for high-speed SPI (>40 MHz) need series resistors to dampen reflections; do not exceed the 30 pF total capacitive load on each SERCOM pin.
Compliance Information
Automotive grade -40C to +125C per SAM E51 datasheet DS60001507D. RoHS and REACH compliant per Microchip product page.
