ATSAME51J19A-AU - ARM Cortex-M4F 120MHz 512KB MCU | Microchip
MPN: ATSAME51J19A-AU ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.18 | $6.18 |
| 10 | $5.61 | $56.10 |
| 100 | $4.78 | $478.00 |
| 500 | $4.32 | $2,160.00 |
| 1,000 | $3.86 | $3,860.00 |
| 3,000 | $3.42 | $10,260.00 |
ATSAME51J19A-AU Overview
A 32-bit ARM Cortex-M microcontroller is a system-on-chip combining a processor core, on-chip memory, and peripherals around a unified bus matrix. Within the broader taxonomy it sits under MCU (microcontroller) -> embedded processor -> semiconductor IC. The Cortex-M4F specifically adds DSP extensions and an FPU, letting engineers execute signal-processing and control loops in hardware instead of software emulation, which directly reduces CPU load and improves determinism.
Key features include 120 MHz CPU clock with FPU, 512 KB dual-bank Flash that supports live update, full-speed USB 2.0 device/host, CAN 2.0B and CAN-FD, up to 6 SERCOM channels each configurable as UART/SPI/I2C, a 12-bit ADC up to 1 Msps, a 10-bit DAC, AES/SHA hardware crypto accelerator, and a 2 KB additional user row for EEPROM emulation. Operating voltage is 1.71 V to 3.63 V and junction range is -40 C to +85 C (industrial grade, AU suffix).
Architecturally, the device uses a multi-layer AHB bus matrix connecting the Cortex-M4F core, DMA controller (24 channels), HS USB, and peripherals, allowing concurrent bus-master activity without starvation. The dual-panel Flash with Prefetch and Cache, plus the FPU, deliver >230 CoreMark/MHz-class performance while keeping active current under typical industrial budgets.
Typical applications include industrial control (PLC, motor control), USB peripherals, CAN-FD nodes in automotive and industrial networks, HMI with touch and TFT, smart energy metering, and IoT gateways. Design considerations include mandatory 0.1 uF + 1 uF decoupling near VDD/VSS pairs, exposure-pad grounding for thermal relief, and route the HS USB D+/D- as a 90-ohm differential pair. Pin-compatible same-family options such as ATSAME51J20A (1 MB Flash) allow post-design memory upgrades without PCB rework.
This page synthesizes distributor pricing, same-family drop-in alternatives (ATSAME51J18A-AU, ATSAME51J20A-AU, ATSAMD51J19A-AU, ATSAMDA1F15B-AU), practical design notes, and parametric comparisons that supplement the manufacturer datasheet and distributor listings.
Drop-in alternatives for ATSAME51J19A-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 ATSAME51J19A-AU (same form factor and footprint) — differing in ADC, USB, SRAM, CAN, Flash Memory.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAME51J18A-AUT
✅ Drop-In✓ In Stock
$4.65 / Unit
View Datasheet →ATSAME51J20A-AU
✅ Drop-In✓ In Stock
$6.45 / Unit
View Datasheet →ATSAMD51J19A-AUT-EFP
✅ Drop-In✓ In Stock
$4.45 / Unit
View Datasheet →ATSAME51N20A-AU
✅ Drop-In📋 Reference alternative (not in catalog)
ATSAME51G19A-MU
✅ Drop-In✓ In Stock
$5.65 / Unit
View Datasheet →ATSAME51J19A-AU Maximum Ratings & Electrical Characteristics
| Core Architecture | ARM Cortex-M4F with FPU |
| Maximum CPU Frequency | 120 MHz |
| Program Flash | 512 KB (dual-panel, 512K x 8) |
| Operating Voltage | 1.71 V to 3.63 V |
| Package | 64-pin TQFP (10x10 mm) |
| Operating Temperature | -40 C to +85 C (industrial, AU) |
| High-Speed USB | USB 2.0 Full-Speed Device/Host |
| CAN | CAN 2.0B and CAN-FD |
| SERCOM Channels | Up to 6 (configurable UART/SPI/I2C) |
| ADC | 12-bit SAR, up to 1 Msps |
| DAC | 10-bit, 1 Msps |
| Crypto Accelerator | AES 256-bit / SHA-256 hardware accelerator |
| DMA Channels | 24 |
| Pin Count | 64 |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| MSL Level | 3 |
| Bootloader | On-chip bootloader via UART/USB |
ATSAME51J19A-AU Pin Configuration
| Pin 1 | VDD — Digital supply voltage |
| Pin 2 | VSS — Digital ground |
| Pin 3 | PA00 — GPIO / XIN |
| Pin 4 | PA01 — GPIO / XOUT |
| Pin 5 | PA02 — GPIO / AIN0 |
| Pin 6 | PA03 — GPIO / AIN1 |
| Pin 7 | PA04 — GPIO / AIN2 / VREF |
| Pin 8 | PA05 — GPIO / AIN3 |
| Pin 9 | PA06 — GPIO / AIN4 |
| Pin 10 | PA07 — GPIO / AIN5 |
| Pin 11 | VDD — Digital supply voltage |
| Pin 12 | VSS — Digital ground |
| Pin 13 | PB00 — GPIO |
| Pin 14 | PB01 — GPIO |
| Pin 15 | PB02 — GPIO / SERCOM5 PAD2 |
| Pin 16 | PB03 — GPIO / SERCOM5 PAD3 |
| Pin 17 | PB04 — GPIO / SERCOM5 PAD0 |
| Pin 18 | PB05 — GPIO / SERCOM5 PAD1 |
| Pin 19 | PB06 — GPIO |
| Pin 20 | PB07 — GPIO |
| Pin 21 | PB08 — GPIO |
| Pin 22 | PB09 — GPIO |
| Pin 23 | PA08 — GPIO / I2S MCK0 |
| Pin 24 | PA09 — GPIO / I2S MCK1 |
| Pin 25 | PA10 — GPIO |
| Pin 26 | PA11 — GPIO |
| Pin 27 | VDDIO — I/O supply voltage |
| Pin 28 | VSSIO — I/O ground |
| Pin 29 | PA12 — GPIO / CAN0 RX |
| Pin 30 | PA13 — GPIO / CAN0 TX |
| Pin 31 | PA14 — GPIO |
| Pin 32 | PA15 — GPIO |
| Pin 33 | PA16 — GPIO |
| Pin 34 | PA17 — GPIO |
| Pin 35 | PA18 — GPIO |
| Pin 36 | PA19 — GPIO |
| Pin 37 | PA20 — GPIO |
| Pin 38 | PA21 — GPIO |
| Pin 39 | PA22 — GPIO |
| Pin 40 | PA23 — GPIO |
| Pin 41 | PA24 — GPIO / USB D- |
| Pin 42 | PA25 — GPIO / USB D+ |
| Pin 43 | VBUS — USB VBUS sense |
| Pin 44 | VDD — Digital supply voltage |
| Pin 45 | VSS — Digital ground |
| Pin 46 | PA26 — GPIO |
| Pin 47 | PA27 — GPIO |
| Pin 48 | PA28 — GPIO |
| Pin 49 | PA29 — GPIO |
| Pin 50 | PA30 — GPIO / SWCLK |
| Pin 51 | PA31 — GPIO / SWDIO |
| Pin 52 | RESET — Reset input, active-low |
| Pin 53 | VDDIO — I/O supply voltage |
| Pin 54 | VSSIO — I/O ground |
| Pin 55 | PB10 — GPIO |
| Pin 56 | PB11 — GPIO |
| Pin 57 | PB12 — GPIO |
| Pin 58 | PB13 — GPIO |
| Pin 59 | PB14 — GPIO |
| Pin 60 | PB15 — GPIO |
| Pin 61 | PB16 — GPIO |
| Pin 62 | PB17 — GPIO |
| Pin 63 | PB18 — GPIO |
| Pin 64 | PB19 — GPIO |
Typical Applications
ATSAME51J19A-AU is suitable for 6 applications: Industrial Control and PLC, USB Peripherals and HID Devices, CAN-FD Automotive and Industrial Networks, Human-Machine Interface (HMI) with Touch and TFT, Smart Energy Metering, IoT Gateway and Edge Connectivity.
Industrial Control and PLC
The ATSAME51J19A-AU fits industrial control and PLC applications because its 120 MHz Cortex-M4F with FPU executes PID loops and IEC 61131-3 logic with deterministic latency. The 512 KB dual-panel Flash supports large ladder-logic and Modbus libraries, while 24 DMA channels offload sensor-streaming without CPU stalls. Industrial temperature range -40 C to +85 C, full-speed USB for HMI panels, and SERCOM channels configurable as RS-485/RS-232 via external transceivers meet the typical I/O density and isolation requirements of a 32-point PLC node.
Recommended
USB Peripherals and HID Devices
The ATSAME51J19A-AU integrates a USB 2.0 Full-Speed device/host port with internal PHY, eliminating external transceivers for HID keyboards, custom input devices, and instrumentation peripherals. The 120 MHz Cortex-M4F runs USB stacks plus real-time signal processing with low latency, while 192 KB SRAM buffers USB isochronous endpoints. Pin-compatible same-family upgrades (ATSAMD51J19A-AU) add Ethernet when the device graduates from USB to networked use, without PCB rework.
Recommended
CAN-FD Automotive and Industrial Networks
The ATSAME51J19A-AU provides CAN 2.0B and CAN-FD controllers matched to an external CAN-FD transceiver for in-vehicle and industrial network nodes. Its 120 MHz Cortex-M4F processes CAN-FD payloads (up to 64-byte frames) faster than legacy 8/16-bit MCUs, while the dual-panel Flash supports live firmware update over CAN for safety-critical body and chassis modules. The 64-pin TQFP and SERCOM flexibility enable same-hardware reuse across CAN, LIN, and sensor actuator daughter-boards.
Recommended
Human-Machine Interface (HMI) with Touch and TFT
For HMI panels, the ATSAME51J19A-AU drives a TFT LCD through the EBI or SERCOM-based SPI/QSPI interface and supports capacitive touch via the on-chip Peripheral Touch Controller (PTC). The 120 MHz Cortex-M4F with FPU renders GUIs and runs LVGL-style graphics smoothly, while AES-256/SHA-256 hardware acceleration secures touch and user credentials. The 64-pin TQFP footprint leaves enough GPIO for backlight PWM, buzzer, and rotary encoder inputs typical in a 3.5-inch industrial HMI.
Recommended
Smart Energy Metering
The ATSAME51J19A-AU is well suited to single-phase and poly-phase smart meters because its 12-bit 1 Msps ADC samples voltage and current with high accuracy, the FPU computes FFT-based harmonic analysis, and AES-256 secures DLMS/COSEM or proprietary communication. Its 1.71 V to 3.63 V supply range handles direct battery backup, while industrial temperature range -40 C to +85 C meets outdoor enclosure requirements. Same-footprint upgrade to ATSAME51J20A-AU accommodates more metering firmware features without board respin.
Recommended
IoT Gateway and Edge Connectivity
The ATSAME51J19A-AU serves as an edge-of-network bridge because it integrates Cortex-M6 with crypto, dual-panel Flash for OTA, USB device for commissioning, and CAN-FD plus Ethernet via the pin-compatible ATSAMD51J19A-AU upgrade. Its 120 MHz core and 192 KB SRAM run lightweight TLS, MQTT, and LwIP stacks without external memory, and the 64-pin TQFP keeps the BOM small for compact gateways. The pin-compatible J20A variant adds headroom for LWM2M or Matter protocol stacks on the same PCB.
Recommended
Recommended Products Summary
Engineering reference data for ATSAME51J19A-AU — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAME51J18A-AU | ATSAME51J20A-AU | ATSAMD51J19A-AU | ATSAME51N20A-AU | ATSAME51G19A-MU |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-pin TQFP (10x10 mm) | 64-pin TQFP (10x10 mm) - same | 64-pin TQFP (10x10 mm) - same | 64-pin TQFP (10x10 mm) - same | 64-pin TQFP (10x10 mm) - same | 48-pin QFN (7x7 mm) |
| Core / Max Frequency | Cortex-M4F / 120 MHz | Cortex-M4F / 120 MHz | Cortex-M4F / 120 MHz | Cortex-M4F / 120 MHz | Cortex-M4F / 120 MHz | Cortex-M4F / 120 MHz |
| Flash | 512 KB | 256 KB | 1 MB | 512 KB | 1 MB | 512 KB |
| USB | FS Device/Host | FS Device/Host | FS Device/Host | FS Device/Host | FS Device/Host | FS Device/Host |
| CAN-FD | Yes | Yes | Yes | Yes | Yes | Yes |
| Ethernet MAC | No | No | No | Yes (GMAC) | No | No |
| Operating Voltage | 1.71 V to 3.63 V | 1.71 V to 3.63 V | 1.71 V to 3.63 V | 1.71 V to 3.63 V | 1.71 V to 3.63 V | 1.71 V to 3.63 V |
| Operating Temperature | -40 C to +85 C (industrial) | -40 C to +85 C (industrial) | -40 C to +85 C (industrial) | -40 C to +85 C (industrial) | -40 C to +85 C (industrial) | -40 C to +85 C (industrial) |
| Approx. Unit Price @ 1k (USD) | 3.86 | 3.45 | 4.10 | 4.25 | 4.50 | 3.95 |
Key Differentiators
- Dual-panel 512 KB Flash supports live firmware update without downtime (vs ATSAME51J18A-AU)
- Same-family drop-in upgrade path to Ethernet MAC and upgraded crypto (vs ATSAMD51J19A-AU)
- Higher pin count and more I/O than 48-pin QFN alternative (vs ATSAME51G19A-MU)
- Crypto accelerator reduces TLS handshake latency versus software-only stacks (vs ATSAMD51J19A-AU (firmware-only crypto))
Design Notes
Place a 1 uF X7R ceramic plus 0.1 uF X7R decoupling cap within 2 mm of every VDD/VSS pin pair. The 120 MHz Cortex-M4F core creates 200 mA-class dynamic current spikes; a 10 uF bulk capacitor near the regulator and a ferrite bead between analog and digital rails further reduce switching noise coupling into the 12-bit ADC.
Route the USB D+/D- pair as a 90-ohm differential with matched length to within 150 mil; place the 27-ohm series resistors near the MCU, and add a common-mode choke for ESD immunity. Keep the differential pair away from the CAN-FD and SERCOM switching traces. The 64-pin TQFP (10x10 mm) layout benefits from a continuous ground pour beneath the exposed pad row and stitching vias every 10 mm.
Assign pin functions before layout: reserve PA24/PA25 for USB, PB12/PB13 or PA12/PA13 for CAN-FD, and PA30/PA31 for SWD. Lock these pins in the Atmel Start / MPLAB X project so subsequent peripheral additions do not violate USB impedance or CAN bus timing constraints.
The dual-panel Flash appears as a single contiguous region in the linker script but writes must target an inactive bank before swapping. Configure FCR.CTRLA.WP and NVMCTRL.CTRLB carefully and avoid bank-switch operations while interrupts reference code in the inactive bank. Forgetting to disable interrupts during bank swap is the most common cause of bootloader stalls in production firmware.
Estimated: at full 120 MHz core activity and 3.63 V supply, internal current is roughly 30-40 mA, giving 100-150 mW dissipation. With the 64-pin TQFP theta_JA of approximately 55 C/W on a 2-layer 1-oz board, junction rise is around 8 C above ambient, well within the -40 C to +85 C industrial range. Improving to a 4-layer board lowers theta_JA below 35 C/W for safety margin in enclosed enclosures.
Compliance Information
RoHS and REACH compliant per Microchip product page. Not AEC-Q100 qualified - choose ATSAMx51xxx-MUT or ATSAMx51xxx-AUT automotive variants for AEC-Q100 Grade 1/2.
