ATSAMD51J19A-MF - 120MHz Cortex-M4F MCU, 512KB Flash | Microchip
MPN: ATSAMD51J19A-MF β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.45 | $8.45 |
| 10 | $7.61 | $76.10 |
| 100 | $6.85 | $685.00 |
| 500 | $6.12 | $3,060.00 |
| 1,000 | $5.4 | $5,400.00 |
ATSAMD51J19A-MF Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program and data memory, peripherals, and I/O into one package. Within the semiconductor hierarchy, the ATSAMD51 belongs to the Cortex-M4F class of microcontrollers, which themselves sit under the broader ARM Cortex-M family, the 32-bit MCU category, and ultimately the embedded computing and power-management-aware system-on-chip ecosystem. The Cortex-M4F core specifically adds hardware single-precision floating-point and DSP instructions, distinguishing it from the Cortex-M0/M0+ (low-power) and Cortex-M7 (highest performance) variants in the same family.
Key features of the ATSAMD51J19A-MF include a 120 MHz Cortex-M4F core with FPU, 512KB Flash with ECC, 192KB SRAM, an integrated Full-Speed USB 2.0 interface with on-chip PHY, a 12-bit 1 MSPS ADC, two 12-bit 1 MSPS DACs, up to 51 GPIO, SERCOM (configurable serial) peripherals supporting I2C/SPI/UART, an I2S audio interface, an Event System, a 32-bit Real-Time Counter, and a Cryptographic Accelerator supporting AES, SHA, and TRNG. The 64-QFN (9x9) package provides a low-profile surface-mount footprint suitable for compact embedded designs.
Architecturally, the ATSAMD51J19A-MF leverages a Harvard bus architecture with separate AHB and APB domains, allowing the Cortex-M4F core, DMA controller, and peripherals to operate in parallel without contention. The Dual-panel Flash bank with ECC supports live firmware updates without halting execution, while the integrated FPU and DSP extensions deliver deterministic single-cycle MAC operations for signal processing. The TrustZone-M alternative (on the SAMD51N/P series) is not present on the J19 variant, simplifying bring-up for general-purpose designs.
Typical applications include USB Human Interface Devices (HID), industrial sensor hubs, IoT edge nodes, motor control and digital signal processing front-ends, audio streaming endpoints, and connected embedded controllers. The combination of USB, DACs, and I2S makes the device a strong fit for USB-to-I2S audio bridges and motorized IoT peripherals, while the 12-bit ADC and SERCOM channels suit multi-sensor data acquisition.
When designing with this device, allocate careful PCB real-estate to the QFN 9x9 thermal/exposed pad, since most heat leaves through it; use at least 4 thermal vias on the center pad to the inner ground plane for adequate dissipation. Decouple VDD and VDDIO with a 100 nF X7R capacitor as close to each pin as possible, and add a 4.7 uF bulk capacitor on each analog rail to suppress switching transients from the DC-DC converter.
Drop-in alternatives for ATSAMD51J19A-MF 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-MF (same form factor and footprint) β differing in DAC, Package, SRAM, USB, ADC.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATSAMD51J18A-MF
β Drop-Inπ Reference alternative (not in catalog)
ATSAMD51G18A-MF
β Drop-Inβ In Stock
$5.11 / Unit
View Datasheet βATSAMD51G19A-MFT
β Drop-Inβ In Stock
$4.02 / Unit
View Datasheet βATSAMD51J19A-AUT-EFP
β Drop-Inβ In Stock
$4.45 / Unit
View Datasheet βATSAMD51J18A-AU-EFP
β Drop-Inβ In Stock
$3.95 / Unit
View Datasheet βATSAMD21J18A-MF
β Drop-Inβ In Stock
$3.6 / Unit
View Datasheet βATSAMD51J19A-MF Maximum Ratings & Electrical Characteristics
| Core | ARM Cortex-M4F with FPU |
| Maximum Clock Speed | 120 MHz |
| Program Memory (Flash) | 512 KB |
| SRAM | 192 KB |
| Operating Voltage Range | 1.71 V to 3.6 V |
| ADC | 12-bit, 1 MSPS |
| DAC | 2x 12-bit, 1 MSPS |
| USB | Full-Speed USB 2.0 with on-chip PHY |
| GPIO Count | Up to 51 |
| Package | 64-QFN (9x9 mm) with exposed pad |
| Operating Temperature | -40C to +125C (extended) |
| Mounting Type | Surface Mount |
| MSL Level | 3 (168 hours) |
| RoHS Status | Compliant |
| Cryptographic Accelerator | AES, SHA, TRNG |
| Serial Peripherals (SERCOM) | Up to 8 (configurable I2C/SPI/UART) |
ATSAMD51J19A-MF Pin Configuration
| Pin 1 | PA00 β GPIO / XIN32K (32.768 kHz crystal input) |
| Pin 2 | PA01 β GPIO / XOUT32K (32.768 kHz crystal output) |
| Pin 3 | PA02 β GPIO / AIN0 (ADC analog input) |
| Pin 4 | PA03 β GPIO / AIN1 / VREFA (ADC reference) |
| Pin 5 | PA04 β GPIO / AIN2 / VREFB |
| Pin 6 | PA05 β GPIO / AIN3 |
| Pin 7 | PA06 β GPIO / AIN4 |
| Pin 8 | PA07 β GPIO / AIN5 |
| Pin 9 | VDDIO β Digital I/O supply voltage |
| Pin 10 | GND β Ground reference |
| Pin 11 | PA08 β GPIO / AIN6 |
| Pin 12 | PA09 β GPIO / AIN7 |
| Pin 13 | PA10 β GPIO / AIN8 / SERCOM0 PAD2 |
| Pin 14 | PA11 β GPIO / AIN9 / SERCOM0 PAD3 |
| Pin 15 | PA12 β GPIO / SERCOM2 PAD0 |
| Pin 16 | PA13 β GPIO / SERCOM2 PAD1 |
| Pin 17 | PA14 β GPIO / SERCOM2 PAD2 |
| Pin 18 | PA15 β GPIO / SERCOM2 PAD3 |
| Pin 19 | PA16 β GPIO / SERCOM1 PAD0 / I2S SCK |
| Pin 20 | PA17 β GPIO / SERCOM1 PAD1 / I2S FS |
| Pin 21 | PA18 β GPIO / SERCOM1 PAD2 / I2S MCK |
| Pin 22 | PA19 β GPIO / SERCOM1 PAD3 / I2S SDO |
| Pin 23 | PA20 β GPIO / SERCOM3 PAD0 / I2S SDI |
| Pin 24 | PA21 β GPIO / SERCOM3 PAD1 |
| Pin 25 | PA22 β GPIO / SERCOM3 PAD2 |
| Pin 26 | PA23 β GPIO / SERCOM3 PAD3 / USB ID |
| Pin 27 | PA24 β GPIO / USB DM (USB minus data line) |
| Pin 28 | PA25 β GPIO / USB DP (USB plus data line) |
| Pin 29 | PA27 β GPIO |
| Pin 30 | PA28 β GPIO |
| Pin 31 | PA30 β GPIO / SWDIO (programming/debug) |
| Pin 32 | PA31 β GPIO / SWCLK (programming/debug) |
| Pin 33 | PB00 β GPIO |
| Pin 34 | PB01 β GPIO |
| Pin 35 | PB02 β GPIO / SERCOM5 PAD0 |
| Pin 36 | PB03 β GPIO / SERCOM5 PAD1 |
| Pin 37 | PB04 β GPIO / SERCOM5 PAD2 |
| Pin 38 | PB05 β GPIO / SERCOM5 PAD3 |
| Pin 39 | PB06 β GPIO / SERCOM4 PAD0 |
| Pin 40 | PB07 β GPIO / SERCOM4 PAD1 |
| Pin 41 | PB08 β GPIO / SERCOM4 PAD2 |
| Pin 42 | PB09 β GPIO / SERCOM4 PAD3 |
| Pin 43 | PB10 β GPIO / DAC0 (12-bit DAC output 0) |
| Pin 44 | PB11 β GPIO / DAC1 (12-bit DAC output 1) |
| Pin 45 | PB12 β GPIO |
| Pin 46 | PB13 β GPIO |
| Pin 47 | PB14 β GPIO |
| Pin 48 | PB15 β GPIO |
| Pin 49 | PB16 β GPIO |
| Pin 50 | PB17 β GPIO |
| Pin 51 | PB18 β GPIO |
| Pin 52 | PB19 β GPIO |
| Pin 53 | PB20 β GPIO |
| Pin 54 | PB21 β GPIO |
| Pin 55 | PB22 β GPIO |
| Pin 56 | PB23 β GPIO |
| Pin 57 | PB24 β GPIO |
| Pin 58 | PB25 β GPIO |
| Pin 59 | PB26 β GPIO |
| Pin 60 | PB27 β GPIO |
| Pin 61 | PB28 β GPIO |
| Pin 62 | PB29 β GPIO |
| Pin 63 | GND β Ground reference |
| Pin 64 | VDDIO β Digital I/O supply voltage |
| Pin EP | Exposed Pad β Thermal pad - solder to PCB ground plane for heat dissipation |
Typical Applications
ATSAMD51J19A-MF is suitable for 6 applications: USB Human Interface Device (HID), Industrial Sensor Hub / Data Acquisition, USB-to-I2S Audio Bridge, IoT Edge Node / Connected Device, Motor Control and Digital Signal Processing Front-End, Connected Medical and Wearable Devices.
USB Human Interface Device (HID)
The ATSAMD51J19A-MF is well suited to USB HID designs because it integrates a Full-Speed USB 2.0 device port with on-chip PHY, removing the need for an external PHY chip. Its 120 MHz Cortex-M4F core easily handles HID class descriptors, button/keyboard matrices, and high-report-rate mouse or game controller protocols at 1000 Hz polling. The 512KB Flash and 192KB SRAM provide ample headroom for USB stacks plus rich device firmware. The 64-QFN (9x9) footprint keeps PCB size small, enabling compact dongle and embedded controller enclosures.
Recommended
Industrial Sensor Hub / Data Acquisition
With 8 SERCOM channels supporting I2C/SPI/UART and a 12-bit 1 MSPS ADC, the ATSAMD51J19A-MF can aggregate data from multiple sensors in industrial settings. Its 120 MHz core runs DSP filtering on raw sensor streams in real time while DMA offloads conversion sequences to free the CPU for higher-level processing. The extended -40C to +125C operating range suits factory-floor cabinets, motor drives, and process control enclosures. The dual-panel Flash with ECC lets remote nodes update firmware in the field without service interruption.
Recommended
USB-to-I2S Audio Bridge
The ATSAMD51J19A-MF can act as a USB-to-I2S audio bridge because it pairs a Full-Speed USB device interface with an I2S peripheral and two 12-bit 1 MSPS DACs. The Cortex-M4F core handles USB audio class enumeration and streaming while I2S delivers bit-perfect audio to an external DAC or codec. Hardware floating-point DSP allows on-the-fly sample-rate conversion and equalization. The 192KB SRAM holds multi-buffered audio frames without dropouts, and the 64-QFN keeps the design slim for headphone dongles and powered speakers.
Recommended
IoT Edge Node / Connected Device
The ATSAMD51J19A-MF fits IoT edge nodes requiring on-device intelligence before cloud upload. Its Cortex-M4F core runs TensorFlow Lite Micro or CMSIS-NN inference at low power, while SERCOM channels connect to Wi-Fi or BLE modules. The Cryptographic Accelerator (AES, SHA, TRNG) secures over-the-air firmware updates and authenticated telemetry. Extended-temperature operation handles outdoor enclosures and industrial cabinets, and the exposed-pad QFN aids heat dissipation for sustained-edge workloads.
Recommended
Motor Control and Digital Signal Processing Front-End
The ATSAMD51J19A-MF handles BLDC and stepper motor control loops thanks to its Cortex-M4F core, single-cycle MAC instructions, and high-resolution PWM timers. The Event System and DMA allow deterministic ADC-to-PWM latency, which is critical for field-oriented control of three-phase motors. Hardware floating-point simplifies coordinate transforms (Clarke/Park) and PI loop math. Its 12-bit ADC and dual 12-bit DACs permit precise current sensing and analog reference generation, while the 64-QFN package fits compact motor drive boards.
Recommended
Connected Medical and Wearable Devices
The ATSAMD51J19A-MF is appropriate for connected medical peripherals such as glucose meters, pulse oximeters, and wearable health monitors. Its 12-bit ADC captures analog biosensor signals with high accuracy, while the integrated USB port charges the device and streams data to a host computer. The Cortex-M4F DSP extensions run on-device heart-rate variability and SpO2 algorithms in real time without offloading to the cloud. Extended-temperature operation and the small 64-QFN package support body-worn enclosures requiring compact, reliable designs.
Recommended
Recommended Products Summary
Engineering reference data for ATSAMD51J19A-MF β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAMD51J18A-MF | ATSAMD51G18A-MF | ATSAMD51G19A-MFT | ATSAMD51J19A-AUT-EFP | ATSAMD21J18A-MF |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-QFN (9x9) | 64-QFN (9x9) - same | 64-QFN (9x9) - same | 64-QFN (9x9) - same | 64-QFN (9x9) - same | 64-QFN (9x9) - same |
| Core Architecture | ARM Cortex-M4F with FPU | ARM Cortex-M4F with FPU | ARM Cortex-M4F with FPU | ARM Cortex-M4F with FPU | ARM Cortex-M4F with FPU | ARM Cortex-M0+ (no FPU) |
| Maximum Clock Speed | 120 MHz | 120 MHz | 120 MHz | 120 MHz | 120 MHz | 48 MHz (-60%) |
| Flash Memory | 512 KB | 256 KB (-50%) | 256 KB (-50%) | 512 KB (match) | 512 KB (match) | 256 KB (-50%) |
| SRAM | 192 KB | 128 KB (-33%) | 128 KB (-33%) | 192 KB (match) | 192 KB (match) | 32 KB (-83%) |
| Operating Temperature | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C (automotive grade) | -40C to +125C |
| Cryptographic Accelerator | AES / SHA / TRNG | AES / SHA / TRNG | AES / SHA / TRNG | AES / SHA / TRNG | AES / SHA / TRNG | Not available |
| USB 2.0 FS PHY | Integrated | Integrated | Integrated | Integrated | Integrated | Integrated |
| Automotive Grade | Industrial (-40C to +125C, no AEC-Q100) | Industrial | Industrial | Industrial | AEC-Q100 qualified | Industrial |
Key Differentiators
- Cortex-M4F with hardware FPU and DSP extensions (vs ATSAMD21J18A-MF)
- Largest memory configuration in the J19A family (vs ATSAMD51J18A-MF)
- Extended temperature operating range (vs ATSAMD51J19A-AUT-EFP)
Design Notes
Estimated: At 120 MHz operation with 1.71 V supply and typical 30 mA active current, the ATSAMD51J19A-MF dissipates roughly 50 mW internally, well within the QFN-64 package's thermal limit. However, at extended temperature (125C) the device's leakage rises sharply; ensure PCB copper around the exposed pad is at least 25 mmΒ² and stitch four 0.3 mm thermal vias through the pad to the internal ground plane for adequate heat extraction in enclosed enclosures.
Place a 100 nF X7R decoupling capacitor as close as possible to each VDDIO pin and a 4.7 uF X5R bulk capacitor on each power rail. For the analog supply VDDCORE, use an LC filter (10 uH + 4.7 uF) to isolate it from digital switching noise per Microchip's SAM D51 hardware design guidelines. Keep the SWD/SWCK traces short (under 50 mm) and protected from high-current paths to maintain debug reliability over the device's operational life.
Do not leave unused GPIO pins floating; configure them as outputs or enable internal pull-downs in firmware to prevent spurious current draw through the input buffer. The XIN32/XOUT32 pins for the 32.768 kHz crystal must use a crystal with load capacitance matching the SAM D51 datasheet's recommendations; mismatched capacitors cause RTC drift of several seconds per day. The USB DP/DM trace impedance must be 90 ohms differential per USB 2.0 specification - do not route across plane splits.
Compliance Information
RoHS compliant per Microchip product page. The ATSAMD51J19A-MF is industrial-grade (extended temperature), not AEC-Q100 qualified - choose ATSAMD51J19A-AUT or ATSAMD51J19A-AUT-EFP for automotive-grade applications.
