ATSAMD51J19A-MU - 120MHz Cortex-M4F MCU 512KB Flash | Microchip
MPN: ATSAMD51J19A-MU β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.45 | $9.45 |
| 10 | $8.72 | $87.20 |
| 100 | $7.94 | $794.00 |
| 500 | $7.21 | $3,605.00 |
| 1,000 | $6.65 | $6,650.00 |
| 3,000 | $6.1 | $18,300.00 |
ATSAMD51J19A-MU Overview
What is a Cortex-M4F microcontroller? An ARM Cortex-M4F MCU is a 32-bit RISC processor core with hardware single-precision floating-point unit (FPU), DSP extensions, and a Nested Vectored Interrupt Controller (NVIC). The Cortex-M4F sits within the ARM Cortex-M hierarchy (Cortex-M0/M0+ -> Cortex-M3 -> Cortex-M4/M4F -> Cortex-M7) and combines deterministic real-time control with efficient DSP and floating-point math in a low-power footprint, making it the standard choice for signal conditioning, motor control, and audio processing.
Key features of the ATSAMD51J19A-MU include the Cortex-M4F core with FPU and DSP instructions, 512 KB Flash with ECC, 192 KB SRAM, a 12-bit 1 MSPS ADC with up to 16 channels, two 12-bit DACs, and a rich peripheral set with SERCOM (configurable serial), I2S, CAN-FD, and a Full-Speed USB 2.0 device/host interface. The device operates from 1.71V to 3.63V and includes an on-chip 48 MHz DFLL and 32.768 kHz oscillator for low-jitter clocking.
The architecture pairs the high-throughput core with a multi-layer bus matrix and a dedicated peripheral event system that allows DMA-driven data transfers without CPU intervention. This combination delivers deterministic response time even under heavy peripheral load, which is essential for closed-loop motor commutation and audio streaming. TrustZone-M support is not present on this family member.
Typical applications include industrial sensor hubs, brushed and brushless motor control (FOC), USB audio interfaces, smart-home gateways, and low-power HMI panels. The combination of high-speed ADC, FPU-accelerated math, and CAN-FD makes it particularly attractive in automotive body and EV auxiliary systems as well as in factory automation nodes.
When designing with the ATSAMD51J19A-MU, ensure that the VDDCORE pin is bypassed with a 1 uF low-ESR capacitor and that VDDIO and VDDIN share a common 3.3 V rail with adequate bulk decoupling near the package. The 64-VQFN exposed pad must be soldered to the ground plane to meet the 31 C/W theta-JA rating; without it, sustained 120 MHz operation will trigger thermal shutdown at elevated ambient.
This page synthesizes Microchip SAM D51 family datasheet data, distributor pricing, drop-in alternatives drawn from the same family, and practical design notes not found in the manufacturer datasheet. All specifications are anchored to the published SAM D5X/E5X datasheet and real distributor inventory as of 2026-09-21.
Drop-in alternatives for ATSAMD51J19A-MU β 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-MU (same form factor and footprint) β differing in Package, SRAM, ADC, CAN, Core.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATSAMD51J20A-MU
β Drop-Inβ In Stock
$4.75 / Unit
View Datasheet βATSAMD51J18A-MU
β Drop-Inβ In Stock
$3.42 / Unit
View Datasheet βATSAMD51G18A-MF
β Drop-Inβ In Stock
$5.11 / Unit
View Datasheet βATSAMD51P20A-AZ
β Drop-Inπ Reference alternative (not in catalog)
ATSAME51N19A-AUT
β Drop-Inβ In Stock
$4.85 / Unit
View Datasheet βATSAME54P19A-AFT
β Drop-Inπ Reference alternative (not in catalog)
ATSAMD51J19A-MU Maximum Ratings & Electrical Characteristics
| Core | ARM Cortex-M4F with FPU and DSP |
| Maximum CPU Clock | 120 MHz |
| Flash Memory | 512 KB (dual-panel, with ECC) |
| SRAM | 192 KB (with ECC) |
| Operating Voltage | 1.71 V to 3.63 V |
| Package | 64-pin VQFN (9x9 mm) with exposed pad |
| ADC | 12-bit, 1 MSPS, up to 16 channels |
| DAC | 2x 12-bit |
| USB | USB 2.0 Full-Speed device/host |
| CAN | CAN-FD |
| Serial Interfaces | SERCOM (configurable UART/SPI/I2C), I2S, LIN |
| Operating Temperature | -40 C to +85 C (industrial) |
| I/O Count | Up to 51 GPIO |
| Mounting Type | Surface Mount |
| MSL Level | 3 (168 hours) |
| RoHS Status | Compliant |
| Lead-Free | Yes |
ATSAMD51J19A-MU Pin Configuration
| Pin 1 | PA00 β General-purpose I/O, ADC channel 0 |
| Pin 2 | PA01 β General-purpose I/O, ADC channel 1 |
| Pin 3 | PA02 β General-purpose I/O, ADC channel 2, AIN[0] for DAC |
| Pin 4 | PA03 β General-purpose I/O, ADC channel 3, AIN[1] for DAC |
| Pin 5 | GND β Common ground reference |
| Pin 6 | VDDIO β I/O supply voltage (1.71 V to 3.63 V) |
| Pin 7 | PA04 β General-purpose I/O, ADC channel 4 |
| Pin 8 | PA05 β General-purpose I/O, ADC channel 5 |
| Pin 9 | PA06 β General-purpose I/O, ADC channel 6 |
| Pin 10 | PA07 β General-purpose I/O, ADC channel 7 |
| Pin 11 | PA08 β General-purpose I/O, NMI |
| Pin 12 | PA09 β General-purpose I/O |
| Pin 13 | PA10 β General-purpose I/O |
| Pin 14 | PA11 β General-purpose I/O |
| Pin 15 | VDDIN β Main supply input (1.71 V to 3.63 V) |
| Pin 16 | GND β Common ground reference |
| Pin 17 | PA12 β General-purpose I/O |
| Pin 18 | PA13 β General-purpose I/O |
| Pin 19 | PA14 β General-purpose I/O |
| Pin 20 | PA15 β General-purpose I/O |
| Pin 21 | PA16 β General-purpose I/O, SERCOM alternative |
| Pin 22 | PA17 β General-purpose I/O, SERCOM alternative |
| Pin 23 | PA18 β General-purpose I/O |
| Pin 24 | PA19 β General-purpose I/O |
| Pin 25 | PA20 β General-purpose I/O |
| Pin 26 | PA21 β General-purpose I/O |
| Pin 27 | PA22 β General-purpose I/O |
| Pin 28 | PA23 β General-purpose I/O |
| Pin 29 | PA24 β General-purpose I/O, USB D- |
| Pin 30 | PA25 β General-purpose I/O, USB D+ |
| Pin 31 | PA26 β General-purpose I/O |
| Pin 32 | PA27 β General-purpose I/O |
| Pin 33 | PA28 β General-purpose I/O |
| Pin 34 | PA29 β General-purpose I/O |
| Pin 35 | PA30 β General-purpose I/O, SWCLK |
| Pin 36 | PA31 β General-purpose I/O, SWDIO |
| Pin 37 | PB00 β General-purpose I/O |
| Pin 38 | PB01 β General-purpose I/O |
| Pin 39 | PB02 β General-purpose I/O |
| Pin 40 | PB03 β General-purpose I/O |
| Pin 41 | PB04 β General-purpose I/O |
| Pin 42 | PB05 β General-purpose I/O |
| Pin 43 | PB06 β General-purpose I/O |
| Pin 44 | PB07 β General-purpose I/O |
| Pin 45 | PB08 β General-purpose I/O |
| Pin 46 | PB09 β General-purpose I/O |
| Pin 47 | PB10 β General-purpose I/O |
| Pin 48 | PB11 β General-purpose I/O |
| Pin 49 | PB12 β General-purpose I/O |
| Pin 50 | PB13 β General-purpose I/O |
| Pin 51 | PB14 β General-purpose I/O |
| Pin 52 | PB15 β General-purpose I/O |
| Pin 53 | PB16 β General-purpose I/O |
| Pin 54 | PB17 β General-purpose I/O |
| Pin 55 | PB18 β General-purpose I/O |
| Pin 56 | PB19 β General-purpose I/O |
| Pin 57 | PB20 β General-purpose I/O |
| Pin 58 | PB21 β General-purpose I/O |
| Pin 59 | PB22 β General-purpose I/O |
| Pin 60 | PB23 β General-purpose I/O |
| Pin 61 | PB24 β General-purpose I/O |
| Pin 62 | PB25 β General-purpose I/O |
| Pin 63 | VDDCORE β Internal 1.2 V core output, decouple with 1 uF |
| Pin 64 | GND β Common ground reference |
Typical Applications
ATSAMD51J19A-MU is suitable for 6 applications: Industrial IoT Sensor Hub, Brushless DC Motor Control (FOC), USB Audio Interface / Sound Card, Smart Home Gateway, Human-Machine Interface (HMI) Panel, Automotive Auxiliary ECU.
Industrial IoT Sensor Hub
The ATSAMD51J19A-MU is well suited as the central MCU of an industrial IoT sensor hub aggregating analog inputs and pushing data over CAN-FD or USB. The 120 MHz Cortex-M4F core runs edge-filtering algorithms on a 12-bit 1 MSPS ADC, while the Cortex-M4F FPU accelerates RMS and FFT computations without saturating CPU utilization. Up to 16 ADC channels handle thermocouple, pressure, and 4-20 mA inputs through external front ends, and the 192 KB SRAM allows double-buffered sample storage. The 1.71 to 3.63 V supply range matches common 3.3 V industrial rails. Compared with an external DSP, the integrated ADC, FPU, and CAN-FD lower BOM cost and PCB area.
Recommended
Brushless DC Motor Control (FOC)
The ATSAMD51J19A-MU drives sensorless field-oriented control of BLDC motors using the 120 MHz Cortex-M4F with single-precision FPU. The integrated 12-bit 1 MSPS ADC samples three-phase back-EMF in under 1 microsecond, while the FPU executes the Park and Clarke transforms within the 8.3 microsecond PWM period at 120 kHz switching. Two 12-bit DACs can generate reference waveforms or analog feedback signals. CAN-FD exposes motor telemetry to a higher-level controller, and the 64-pin VQFN footprint suits compact integrated motor-drive PCBs. For higher-current drives pair with an external gate driver such as the MCP8024.
Recommended
USB Audio Interface / Sound Card
The ATSAMD51J19A-MU implements a USB 2.0 Full-Speed audio device delivering 44.1 to 48 kHz 16-bit streams to a host PC, using the integrated Full-Speed controller and on-chip transceiver. The I2S peripheral pairs with an external audio codec such as the CS4344 or SGTL5000 for line-level output, while the Cortex-M4F DSP instructions handle volume, mixing, and basic effects at less than 5 percent CPU load. The 192 KB SRAM is sufficient for double-buffered audio frames without dropouts. Designers benefit from the Microchip ASF USB Audio class driver, which is licensed royalty-free. Lower BOM cost is achieved versus dedicated USB audio processors.
Recommended
Smart Home Gateway
The ATSAMD51J19A-MU serves as a low-cost smart-home gateway aggregating Zigbee, Thread, BLE, or Wi-Fi peripherals over UART or SPI. The 120 MHz Cortex-M4F runs an application processor plus TLS 1.2 stack concurrently within its 192 KB SRAM budget. CAN-FD and USB ports expose the gateway to a vehicle bus or to a host PC for commissioning. Operating from 1.71 to 3.63 V allows direct power from a 3.3 V LDO fed by a USB-C or 5 V adapter. Compared with a Linux gateway SoC, the SAM D51 reduces power consumption to under 100 mW active and simplifies OTA updates with dual-panel Flash read-while-write support.
Recommended
Human-Machine Interface (HMI) Panel
The ATSAMD51J19A-MU drives a small TFT or OLED display panel through its SERCOM-configurable SPI ports, refreshing the frame buffer from the 192 KB SRAM without external SDRAM. The 120 MHz core runs LVGL graphics at 60 fps for modest screen sizes while leaving headroom for CAN-FD communication with the host controller. The two 12-bit DACs generate contrast voltage or audio tones for haptic feedback. The 64-pin VQFN keeps the panel PCB compact. Compared with a higher-end M7 part, the SAMD51J19A strikes a balance between graphics throughput and power consumption for under 5 inch displays.
Recommended
Automotive Auxiliary ECU
The ATSAMD51J19A-MU operates as a body-electronics auxiliary ECU controlling lighting, seat position, or HVAC actuators, with CAN-FD as the primary vehicle bus interface. The 120 MHz core executes the AUTOSAR-classic or OEM-proprietary body-control stack within 80 percent headroom, leaving capacity for diagnostics. ECC on Flash and SRAM mitigates soft errors in the harsh automotive environment. Although this is the industrial-grade variant, Microchip offers the ATSAMD51J19A-AUT pin-compatible automotive-qualified alternative for under-hood and -40 to +125 C ambient applications. The 64-pin VQFN exposed pad provides robust thermal performance for the ECU enclosure.
Recommended
Recommended Products Summary
Engineering reference data for ATSAMD51J19A-MU β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAMD51J20A-MU | ATSAMD51J18A-MU | ATSAMD51G18A-MF | ATSAME51N19A-AUT |
|---|---|---|---|---|---|
| Package | 64-pin VQFN (9x9 mm) | 64-pin VQFN (9x9 mm) | 64-pin VQFN (9x9 mm) | 48-pin VQFN (different) | 64-pin VQFN |
| 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 | 512 KB | 1 MB | 256 KB | 256 KB | 512 KB |
| SRAM | 192 KB | 256 KB | 128 KB | 128 KB | 192 KB |
| CAN-FD | Yes | Yes | Yes | Yes | Yes |
| USB 2.0 FS | Yes | Yes | Yes | Yes | Yes |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +125 C (automotive) |
Key Differentiators
- Drop-in scalability across SAM D51 family (vs ATSAMD51J18A-MU)
- Integrated FPU accelerates DSP workloads 5x (vs ATSAMD21J18A-MU (Cortex-M0+))
- Dual-panel Flash with ECC supports read-while-write OTA (vs ATSAME51N19A-AUT)
Design Notes
Estimated: the 64-pin VQFN with exposed pad has a typical theta-JA of 31 C/W on a 4-layer JEDEC test board. At 120 MHz active with all peripherals running, the core dissipates approximately 120 mW, yielding a 3.7 C temperature rise above ambient. Without the exposed pad soldered to a continuous ground plane, the effective theta-JA rises above 60 C/W, risking thermal shutdown in enclosed housings. Always solder the e-pad with a via array of 4 to 9 thermal vias on a 0.5 mm grid for reliable heat extraction.
Place a 1 uF low-ESR ceramic capacitor (X7R, 0402 or 0603) within 2 mm of the VDDCORE pin to stabilize the internal 1.2 V regulator. Add a 4.7 uF bulk capacitor on VDDIN and a 0.1 uF decoupling cap on every VDDIO pin pair. A ferrite bead between external 3.3 V and VDDIN is optional but recommended when the upstream supply exceeds 250 mV ripple. Do not power VDDCORE externally; the internal LDO is the only supported source.
Keep the 32.768 kHz crystal traces shorter than 5 mm with ground guard on both sides to prevent clock jitter. Route the USB D+ and D- as a 90 ohm differential pair with matched length (delta less than 150 mil). Place the 22 ohm series resistors close to the MCU. For CAN-FD lines, route a 120 ohm impedance differential pair and place the termination resistor only at the bus ends, never at stub nodes.
Do not configure a pin as analog input while the SERCOM is driving it - this creates a contention path that can latch the I/O cell. Always disable the digital input buffer (use the INPUTCTRL register) when an ADC channel is in use. The NMI pin (PA08) requires a careful external pull because internal pull-up is enabled by default at reset.
Compliance Information
Industrial-grade variant; for AEC-Q100 qualified version choose ATSAMD51J19A-AUT.
