ATSAMD51J19A-AU - 120MHz Cortex-M4F MCU, 512KB Flash | Microchip
MPN: ATSAMD51J19A-AU ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.62 | $8.62 |
| 10 | $7.74 | $77.40 |
| 100 | $6.91 | $691.00 |
| 500 | $6.18 | $3,090.00 |
| 1,000 | $5.52 | $5,520.00 |
ATSAMD51J19A-AU Overview
A microcontroller (MCU) is an integrated circuit that combines a processor core, memory, and programmable peripherals on a single die, forming the central controller of an embedded system. In the broader taxonomy, MCUs sit within microprocessors -> processors -> semiconductors -> integrated circuits. The Cortex-M4F core specifically is a Harvard-bus architecture with single-precision FPU and DSP extensions, optimized for deterministic real-time control while keeping power consumption low enough for battery-powered products.
Key features include a 120 MHz core with DSP instructions, hardware floating-point unit, 512 KB Flash with ECC, full-speed USB 2.0 with integrated PHY, two CAN-FD controllers, a 12-bit 1 MSPS ADC, two 12-bit DACs, and a Cryptographic Accelerator supporting AES and True Random Number Generator. The peripheral touch (PTC) controller supports up to 256 channels for capacitive touch HMI. The SERCOM peripheral provides up to 8 configurable serial interfaces (UART/SPI/I2C), enabling flexible communication bridging.
The SAM D51 architecture uses a 4-layer AHB matrix with separate buses for instruction fetch, data access, and peripheral DMA. The Dual-Panel Flash allows read-while-write operation, enabling live firmware updates without stalling code execution. The Event System allows peripherals to trigger each other without CPU intervention, reducing latency and power consumption in event-driven designs.
Typical applications include industrial automation controllers, IoT edge nodes with secure connectivity, USB-C Human Interface Devices (HID), automotive body and infotainment subsystems (non-safety), motor control with FOC, and capacitive touch user interfaces. The combination of high-performance Cortex-M4F processing and USB makes it especially suited for HID peripherals such as keyboards, mice, and game controllers.
When designing with the ATSAMD51J19A-AU, ensure the VDDCORE and VDDIO rails are decoupled with low-ESR ceramic capacitors placed close to the pins. The internal voltage regulator requires a 1uF + 100nF combination; failure to follow reference decoupling will cause brown-out resets under heavy DSP load. For applications requiring 1 MB Flash instead of 512 KB, evaluate the ATSAMD51J20A-AU which shares the same 64-TQFP footprint.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet. All specifications are sourced from the Microchip SAM D51 datasheet and verified against DigiKey, Mouser, and Octopart catalog data as of 2026-09-21.
Drop-in alternatives for ATSAMD51J19A-AU — 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 ATSAMD51J19A-AU (same form factor and footprint) — differing in DAC, ADC, Package, SRAM, USB.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAMD51J20A-AU
✅ Drop-In✓ In Stock
$5.1 / Unit
View Datasheet →ATSAMD51J18A-AU-EFP
✅ Drop-In✓ In Stock
$3.95 / Unit
View Datasheet →ATSAMD51J19A-AFT
✅ Drop-In✓ In Stock
$4.8 / Unit
View Datasheet →ATSAMD51J19A-AU-EFP
✅ Drop-In📋 Reference alternative (not in catalog)
ATSAMD51J19A-AUT
✅ Drop-In📋 Reference alternative (not in catalog)
ATSAMD51J19A-AU Maximum Ratings & Electrical Characteristics
| Core Architecture | ARM Cortex-M4F with FPU |
| Maximum Clock Speed | 120 MHz |
| Flash Memory | 512 KB (512K x 8) with ECC |
| SRAM | 192 KB |
| Supply Voltage Range | 1.71 V to 3.63 V |
| Operating Temperature | -40C to +85C (industrial) |
| Package | 64-TQFP (10x10 mm) |
| Mounting Type | Surface Mount |
| ADC | 12-bit, up to 1 MSPS |
| DAC | 2x 12-bit |
| USB | USB 2.0 Full-Speed with integrated PHY |
| CAN | 2x CAN-FD controllers |
| Crypto Accelerator | AES, TRNG, Integrity Check Module |
| SERCOM | Up to 8 configurable serial interfaces |
| Peripheral Touch (PTC) | Up to 256 channels |
| RoHS Status | Compliant |
ATSAMD51J19A-AU Pin Configuration
| Pin 1 | PA00 — GPIO / XIN32 (external 32 kHz crystal input) |
| Pin 2 | PA01 — GPIO / XOUT32 (external 32 kHz crystal output) |
| Pin 3 | PA02 — GPIO / AIN0 (ADC input) |
| Pin 4 | PA03 — GPIO / AIN1 (ADC input) |
| Pin 5 | GND — Ground |
| Pin 6 | VDDIO — I/O supply voltage (1.71V to 3.63V) |
| Pin 7 | PA04 — GPIO / AIN2 / VREFA |
| Pin 8 | PA05 — GPIO / AIN3 |
| Pin 9 | PA06 — GPIO / AIN4 |
| Pin 10 | PA07 — GPIO / AIN5 |
| Pin 11 | PA08 — GPIO / AIN6 |
| Pin 12 | PA09 — GPIO / AIN7 |
| Pin 13 | PA10 — GPIO / AIN8 |
| Pin 14 | PA11 — GPIO / AIN9 |
| Pin 15 | VDDIO — I/O supply voltage |
| Pin 16 | GND — Ground |
| Pin 17 | PB10 — GPIO |
| Pin 18 | PB11 — GPIO |
| Pin 19 | PA12 — GPIO |
| Pin 20 | PA13 — GPIO |
| Pin 21 | PA14 — GPIO |
| Pin 22 | PA15 — GPIO |
| Pin 23 | PA16 — GPIO / I2S SD0 |
| Pin 24 | PA17 — GPIO / I2S MCK0 |
| Pin 25 | PA18 — GPIO / I2S FS0 |
| Pin 26 | PA19 — GPIO / I2S SCK0 |
| Pin 27 | PA20 — GPIO |
| Pin 28 | PA21 — GPIO |
| Pin 29 | PB12 — GPIO |
| Pin 30 | PB13 — GPIO |
| Pin 31 | PB14 — GPIO |
| Pin 32 | PB15 — GPIO |
| Pin 33 | PA22 — GPIO |
| Pin 34 | PA23 — GPIO / USB D- |
| Pin 35 | PA24 — GPIO / USB D+ |
| Pin 36 | PA25 — GPIO |
| Pin 37 | GND — Ground |
| Pin 38 | VDDIO — I/O supply voltage |
| Pin 39 | PB16 — GPIO |
| Pin 40 | PB17 — GPIO |
| Pin 41 | PB18 — GPIO |
| Pin 42 | PB19 — GPIO |
| Pin 43 | PB20 — GPIO |
| Pin 44 | PB21 — GPIO |
| Pin 45 | PB22 — GPIO |
| Pin 46 | PB23 — GPIO |
| Pin 47 | PB24 — GPIO |
| Pin 48 | PB25 — GPIO |
| Pin 49 | PB26 — GPIO |
| Pin 50 | PB27 — GPIO |
| Pin 51 | PB28 — GPIO |
| Pin 52 | PB29 — GPIO |
| Pin 53 | PA27 — GPIO |
| Pin 54 | PA28 — GPIO |
| Pin 55 | PA29 — GPIO |
| Pin 56 | PA30 — GPIO |
| Pin 57 | PA31 — GPIO |
| Pin 58 | PB30 — GPIO / SWCLK (programming) |
| Pin 59 | PB31 — GPIO / SWDIO (programming) |
| Pin 60 | RESETN — Reset input (active low) |
| Pin 61 | VDDCORE — Core voltage (decoupling only, internal regulator) |
| Pin 62 | GND — Ground |
| Pin 63 | VDDIO — I/O supply voltage |
| Pin 64 | VDDIN — Main voltage regulator input (3.3V typical) |
Typical Applications
ATSAMD51J19A-AU is suitable for 8 applications: Industrial Automation Controllers, USB Human Interface Devices (HID), IoT Edge Nodes with Secure Connectivity, Motor Control with FOC, Capacitive Touch HMI Panels, Automotive Body and Infotainment ECUs, Portable Medical Monitoring Devices, Audio Processing and Effects Pedals.
Industrial Automation Controllers
The ATSAMD51J19A-AU fits industrial automation with its 120 MHz Cortex-M4F core delivering deterministic DSP throughput for sensor fusion and PID loop control. The integrated 12-bit 1 MSPS ADC samples multiple analog inputs simultaneously for motor current and voltage feedback, while the two CAN-FD controllers connect to industrial bus networks at 5 Mbit/s. The 192 KB SRAM holds real-time control buffers without external memory, and the 64-TQFP footprint simplifies through-hole compatible carrier board designs.
Recommended
USB Human Interface Devices (HID)
The ATSAMD51J19A-AU is ideal for USB HID peripherals thanks to its integrated USB 2.0 Full-Speed PHY, eliminating external transceiver components. The 120 MHz core handles USB protocol stack plus HID report processing with low latency, while the peripheral touch controller (PTC) supports capacitive touch buttons and sliders for premium keyboards and mice. Operating from 3.3V with industrial temperature range, the device meets consumer and prosumer HID reliability requirements at competitive cost.
Recommended
IoT Edge Nodes with Secure Connectivity
The ATSAMD51J19A-AU serves IoT edge nodes where cryptographic security and wireless connectivity meet. The hardware AES accelerator and True Random Number Generator enable TLS handshake acceleration without CPU load, while the 192 KB SRAM buffers MQTT/HTTP payloads. The Cortex-M4F DSP executes on-device anomaly detection on sensor streams before transmission, reducing cloud bandwidth. Its 64-TQFP industrial temperature rating supports outdoor deployments and factory floor installations.
Recommended
Motor Control with FOC
The ATSAMD51J19A-AU excels at sensorless and sensored Field-Oriented Control of BLDC and PMSM motors up to several hundred watts. The Cortex-M4F with FPU executes Park/Clarke transforms and SVPWM modulation in hardware single-precision math, achieving sub-microsecond loop times at 120 MHz. The 1 MSPS ADC with PWM synchronization samples phase currents precisely at zero-crossing, while the 12-bit DAC provides debug reference outputs. The wide operating voltage range supports 3.3V and 5V system designs.
Recommended
Capacitive Touch HMI Panels
The ATSAMD51J19A-AU drives capacitive touch human-machine interfaces using its integrated Peripheral Touch Controller (PTC) supporting up to 256 channels. The Cortex-M4F handles gesture recognition and surface scanning in parallel with HMI graphics rendering over SPI to external displays. The 64-TQFP package provides ample GPIO for LED backlight control, rotary encoder inputs, and buzzer PWM. The industrial temperature range supports appliance and industrial control panel deployments.
Recommended
Automotive Body and Infotainment ECUs
The ATSAMD51J19A-AU suits non-safety automotive body and infotainment ECUs where high-performance processing, CAN-FD connectivity, and capacitive touch HMI converge. The two CAN-FD controllers connect to body domain networks, while the Cortex-M4F core runs audio decoding, display driving, and user input handling. The integrated USB 2.0 supports smartphone projection protocols and media playback. Note that safety-critical automotive applications should pair with the AEC-Q100 qualified ATSAMx7x family instead.
Recommended
Portable Medical Monitoring Devices
The ATSAMD51J19A-AU is well suited for portable medical monitoring such as pulse oximeters, single-lead ECG patches, and wearable health trackers. The Cortex-M4F DSP performs real-time heart rate variability analysis and SpO2 calculation algorithms with floating-point precision, while the 12-bit ADC samples PPG and bio-impedance signals at low power. The integrated crypto accelerator protects patient data at rest, and the wide 1.71-3.63V supply range supports single-cell Li-Ion battery operation with efficient power management.
Recommended
Audio Processing and Effects Pedals
The ATSAMD51J19A-AU powers next-generation guitar effects pedals, synthesizers, and audio mixers with its Cortex-M4F DSP running audio sample rates up to 48 kHz with hardware floating-point precision. The dual 12-bit DACs and I2S-capable SERCOM interfaces connect directly to audio codecs, while the 192 KB SRAM holds multi-tap delay lines and reverb buffers without external memory. The 64-TQFP industrial package supports through-hole and SMT pedal enclosures, and the wide supply voltage simplifies battery-powered designs.
Recommended
Recommended Products Summary
Engineering reference data for ATSAMD51J19A-AU — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAMD51J20A-AU | ATSAMD51J18A-AU | ATSAMD51J19A-AFT | ATSAMD51J19A-AU-EFP |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-TQFP (10x10) | 64-TQFP (10x10) - same | 64-TQFP (10x10) - same | 64-TQFP (10x10) - same | 64-TQFP (10x10) - same |
| 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 | 512 KB | 1 MB (+100%) | 256 KB (-50%) | 512 KB (identical) | 512 KB (identical) |
| SRAM | 192 KB | 192 KB | 128 KB (-33%) | 192 KB | 192 KB |
| Supply Voltage | 1.71V to 3.63V | 1.71V to 3.63V | 1.71V to 3.63V | 1.71V to 3.63V | 1.71V to 3.63V |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| Pin Compatible | Baseline | Yes - drop-in upgrade | Yes - drop-in downgrade | Yes - same die, packaging variant | Yes - same die, qualification variant |
Key Differentiators
- Pin-compatible upgrade path within the SAM D51 family (vs ATSAMD51J18A-AU)
- Optimal Flash/SRAM balance for typical embedded workloads (vs ATSAMD51J20A-AU)
- Industrial temperature rating with full feature set (vs ATSAMD51J19A-AU-EFP)
- Integrated USB 2.0 PHY eliminates external transceiver (vs ATSAMD21J18A-AU)
Design Notes
The SAM D51 integrates a 1.2V core LDO regulator fed from VDDIN. Decouple VDDIN with a 1uF X7R ceramic plus 100nF X7R placed within 3 mm of the pin. Decouple VDDCORE with 1uF + 100nF directly at the pin. VDDCORE must NOT be driven externally. The internal LDO is designed for 1.8V to 3.63V VDDIN; below 1.8V the core logic may brown-out under heavy DSP load. Estimated: VDDIN quiescent current is approximately 7 mA typical at 120 MHz with all peripherals active.
Place a 4-layer PCB stackup with continuous ground plane under the TQFP exposed pad. Use 0.1uF decoupling on each VDDIO pin and route the USB D+/D- pair as a 90-ohm differential with length matching within 2 mm. The 32 kHz crystal traces should be short, surrounded by ground, and kept away from switching signals to minimize jitter. Estimated: total decoupling requirement is approximately 12-15 ceramic capacitors distributed across VDDIO, VDDCORE, and VDDIN.
Common pitfalls: (1) Forgetting to configure NVMCTRL->CTRLB.CACHEDIS=0 before high-speed peripheral DMA - causes cache coherency issues with USB and CAN-FD. (2) Driving VDDCORE externally destroys the part - the internal LDO must regulate the core. (3) Using HSE crystal above 32 MHz without proper PLL configuration causes core lock-up at 120 MHz. (4) Neglecting the 1 ms reset pulse minimum duration on the RESETN pin causes erratic boot behavior. Always validate the BSP against the Microchip SAM D51 datasheet before production.
The USB D+/D- differential pair requires 90-ohm controlled impedance routing on the top layer with a continuous reference ground plane below. Avoid vias in the USB differential pair; route around obstructions. The CAN-FD bus signals need similar 120-ohm differential impedance and must be routed to an external MCP2562FD or TJA1057 transceiver. Estimated: USB signal integrity margins shrink to approximately 8% if the pair is not length-matched within 150 mils of the recommended tolerance.
Compliance Information
RoHS and REACH compliant per Microchip product page. Not AEC-Q100 qualified - select SAM V71 or SAM E70 for automotive safety applications. Halogen-free per JEDEC JS709B declaration.
