ATSAMD51P19A-AFT - 120MHz Cortex-M4F MCU, 512KB Flash | Microchip
MPN: ATSAMD51P19A-AFT β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.84 | $9.84 |
| 10 | $8.95 | $89.50 |
| 100 | $7.72 | $772.00 |
| 500 | $6.83 | $3,415.00 |
| 1,000 | $6.18 | $6,180.00 |
ATSAMD51P19A-AFT Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, memory, and programmable peripherals. The ATSAMD51P19A-AFT extends the baseline Cortex-M4 (an ARM processor with DSP extensions) by adding a single-precision floating-point unit (FPU), making it a Cortex-M4F variant. It sits within the hierarchy: Cortex-M4F -> ARM Cortex-M family -> 32-bit MCU -> microcontroller -> embedded processor -> semiconductor. The Cortex-M4F core reaches 1.25 DMIPS/MHz with hardware single-precision FP, enabling efficient DSP and audio codec workloads.
Key features include 512 KB Flash with ECC (dual-panel, supporting live update), 192 KB SRAM, a 2 MB embedded SRAM (HSRAM) subsystem with 8 KB tightly-coupled memory, a 12-bit 1 MSPS ADC with up to 16 channels, dual CAN-FD controllers, USB 2.0 Full-Speed with PHY, and SERCOM peripherals configurable as UART/SPI/I2C. A 32-bit audio engine (I2S), 16-bit PWM timers, and an Event System allow deterministic low-latency IO. Cryptographic accelerators for AES, SHA-256, and True Random Number Generator (TRNG) support secure-boot implementations.
The SAM D51 architecture uses Microchip's proprietary embedded Flash technology with cache prefetch to maximize instruction throughput at 120 MHz. The peripheral DMA controller (DMAC) can move data between memory and peripherals without CPU intervention, freeing the M4F core for floating-point math-intensive tasks such as FFT/audio filtering or motor-control PID loops.
Typical applications include smart-home IoT gateways, industrial sensor aggregation nodes, USB Audio Class (UAC) sound cards, BLDC and stepper motor drives with field-oriented control (FOC), secure-connected consumer devices with OTA firmware updates, and human-machine interface (HMI) panels using TFT displays with capacitive touch via the Parallel Capture Interface (PCL). The integrated CAN-FD makes it directly applicable to automotive body and chassis networking subsets, though not AEC-Q100 qualified at the -AFT suffix (industrial -40 to +125C only).
A key design consideration: this 128 TQFP variant is footprint-compatible with the larger-density ATSAMD51P20A and the smaller ATSAMD51P19A - all share the same 14x14 mm TQFP land pattern and pinout, enabling seamless memory migration during board bring-up. Developers should plan for an external 32.768 kHz crystal for RTC accuracy if battery-backed timekeeping is required; the internal 16 MHz DFLL is accurate to about 1% across temperature, suitable for UART baud rates but not for precision RTC.
This page synthesizes distributor pricing, same-package Microchip alternates (ATSAME54P19A-AFT, ATSAME51N19A-AUT), and practical design notes for the ATSAMD51P19A-AFT - supplementing what is found in the manufacturer datasheet alone.
Drop-in alternatives for ATSAMD51P19A-AFT 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 ATSAMD51P19A-AFT (same form factor and footprint) β differing in ADC, Core Architecture, DAC, Package, SRAM.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATSAME54P19A-AFT
β Drop-Inπ Reference alternative (not in catalog)
ATSAMD51P20A-AFT
β Drop-Inπ Reference alternative (not in catalog)
ATSAMD51P19A-AUT
β Drop-Inπ Reference alternative (not in catalog)
ATSAMD51P19A-AF
β Drop-Inπ Reference alternative (not in catalog)
ATSAMD51P19A-CFT
β Drop-Inπ Reference alternative (not in catalog)
ATSAMD51P19A-AFT Maximum Ratings & Electrical Characteristics
| Core Architecture | ARM Cortex-M4F (with FPU) |
| Maximum Clock Speed | 120 MHz |
| Program Memory (Flash) | 512 KB (dual-panel with ECC) |
| SRAM | 192 KB (with 8 KB TCM) |
| Supply Voltage (VDD) | 1.71 V to 3.63 V |
| Operating Temperature | -40C to +125C (industrial) |
| Package | 128-TQFP (14x14 mm) |
| ADC | 12-bit, 1 MSPS, up to 16 channels |
| DAC | 12-bit, 2 channels |
| USB | USB 2.0 Full-Speed with integrated PHY |
| CAN | 2x CAN-FD controllers |
| SERCOM | Up to 8 SERCOM (UART/SPI/I2C-configurable) |
| Crypto Accelerator | AES, SHA-256, TRNG |
| Mounting Type | Surface Mount |
| MSL Level | 3 (168 hours) |
| RoHS Status | Compliant |
ATSAMD51P19A-AFT Pin Configuration
| Pin 1 | VDDIO β IO voltage supply |
| Pin 2 | PA00 β GPIO / SERCOM1.0 / I2S FS0 |
| Pin 3 | PA01 β GPIO / SERCOM1.1 / I2S SCK0 |
| Pin 4 | PA02 β GPIO / SERCOM1.2 / ADC AIN0 |
| Pin 5 | PA03 β GPIO / SERCOM1.3 / ADC AIN1 |
| Pin 6 | PA04 β GPIO / SERCOM0.0 / ADC AIN2 |
| Pin 7 | PA05 β GPIO / SERCOM0.1 / ADC AIN3 |
| Pin 8 | PA06 β GPIO / SERCOM0.2 / ADC AIN4 |
| Pin 9 | PA07 β GPIO / SERCOM0.3 / ADC AIN5 |
| Pin 10 | VDDIO β IO voltage supply |
| Pin 11 | GND β Ground |
| Pin 12 | PA08 β GPIO / SERCOM2.0 / I2C SDA |
| Pin 13 | PA09 β GPIO / SERCOM2.1 / I2C SCL |
| Pin 14 | PA10 β GPIO / SERCOM2.2 |
| Pin 15 | PA11 β GPIO / SERCOM2.3 |
| Pin 16 | PA12 β GPIO / SERCOM4.0 / CAN0 TX |
| Pin 17 | PA13 β GPIO / SERCOM4.1 / CAN0 RX |
| Pin 18 | PA14 β GPIO / SERCOM4.2 |
| Pin 19 | PA15 β GPIO / SERCOM4.3 |
| Pin 20 | GND β Ground |
| Pin 21 | PA16 β GPIO / SERCOM3.0 / I2S FS1 |
| Pin 22 | PA17 β GPIO / SERCOM3.1 / I2S SCK1 |
| Pin 23 | PA18 β GPIO / SERCOM3.2 / I2S SD0 |
| Pin 24 | PA19 β GPIO / SERCOM3.3 / I2S MCK0 |
| Pin 25 | PA20 β GPIO / SERCOM5.2 |
| Pin 26 | PA21 β GPIO / SERCOM5.3 |
| Pin 27 | PA22 β GPIO / SERCOM3.0 |
| Pin 28 | PA23 β GPIO / SERCOM3.1 |
| Pin 29 | PA24 β GPIO / SERCOM3.2 / USB_DM |
| Pin 30 | PA25 β GPIO / SERCOM3.3 / USB_DP |
| Pin 31 | GND β Ground |
| Pin 32 | PB00 β GPIO / SERCOM5.0 / ADC AIN8 |
| Pin 33 | PB01 β GPIO / SERCOM5.1 / ADC AIN9 |
| Pin 34 | PB02 β GPIO / SERCOM5.2 / ADC AIN10 |
| Pin 35 | PB03 β GPIO / SERCOM5.3 / ADC AIN11 |
| Pin 36 | PB04 β GPIO / ADC AIN12 |
| Pin 37 | PB05 β GPIO / ADC AIN13 |
| Pin 38 | PB06 β GPIO / ADC AIN14 |
| Pin 39 | PB07 β GPIO / ADC AIN15 |
| Pin 40 | PB08 β GPIO / SERCOM4.0 / I2C SDA |
| Pin 41 | PB09 β GPIO / SERCOM4.1 / I2C SCL |
| Pin 42 | PB10 β GPIO / SERCOM4.2 |
| Pin 43 | PB11 β GPIO / SERCOM4.3 |
| Pin 44 | PB12 β GPIO / SERCOM6.0 |
| Pin 45 | PB13 β GPIO / SERCOM6.1 |
| Pin 46 | PB14 β GPIO / SERCOM6.2 |
| Pin 47 | PB15 β GPIO / SERCOM6.3 |
| Pin 48 | GND β Ground |
| Pin 49 | PB16 β GPIO / SERCOM7.0 / TC4 WO0 |
| Pin 50 | PB17 β GPIO / SERCOM7.1 / TC4 WO1 |
| Pin 51 | PB18 β GPIO / SERCOM7.2 |
| Pin 52 | PB19 β GPIO / SERCOM7.3 |
| Pin 53 | PB20 β GPIO / SERCOM3.0 |
| Pin 54 | PB21 β GPIO / SERCOM3.1 |
| Pin 55 | PB22 β GPIO / SERCOM3.2 |
| Pin 56 | PB23 β GPIO / SERCOM3.3 |
| Pin 57 | PC00 β GPIO / SERCOM6.0 |
| Pin 58 | PC01 β GPIO / SERCOM6.1 |
| Pin 59 | PC02 β GPIO / SERCOM6.2 |
| Pin 60 | PC03 β GPIO / SERCOM6.3 |
| Pin 61 | PC04 β GPIO / SERCOM7.0 |
| Pin 62 | PC05 β GPIO / SERCOM7.1 |
| Pin 63 | PC06 β GPIO / SERCOM7.2 |
| Pin 64 | PC07 β GPIO / SERCOM7.3 |
| Pin 65 | VDDIO β IO voltage supply |
| Pin 66 | PC08 β GPIO |
| Pin 67 | PC09 β GPIO |
| Pin 68 | PC10 β GPIO |
| Pin 69 | PC11 β GPIO |
| Pin 70 | PC12 β GPIO |
| Pin 71 | PC13 β GPIO |
| Pin 72 | PC14 β GPIO |
| Pin 73 | PC15 β GPIO |
| Pin 74 | PC16 β GPIO |
| Pin 75 | PC17 β GPIO |
| Pin 76 | PC18 β GPIO |
| Pin 77 | PC19 β GPIO |
| Pin 78 | PC20 β GPIO |
| Pin 79 | PC21 β GPIO |
| Pin 80 | GND β Ground |
| Pin 81 | PD00 β GPIO |
| Pin 82 | PD01 β GPIO |
| Pin 83 | PD02 β GPIO |
| Pin 84 | PD03 β GPIO |
| Pin 85 | PD04 β GPIO |
| Pin 86 | PD05 β GPIO |
| Pin 87 | PD06 β GPIO |
| Pin 88 | PD07 β GPIO |
| Pin 89 | PD08 β GPIO |
| Pin 90 | PD09 β GPIO |
| Pin 91 | PD10 β GPIO |
| Pin 92 | PD11 β GPIO |
| Pin 93 | PD12 β GPIO |
| Pin 94 | PD13 β GPIO |
| Pin 95 | PD14 β GPIO |
| Pin 96 | PD15 β GPIO |
| Pin 97 | PD16 β GPIO |
| Pin 98 | PD17 β GPIO |
| Pin 99 | PD18 β GPIO |
| Pin 100 | PD19 β GPIO |
| Pin 101 | VDDCORE β Core voltage supply (1.2V) |
| Pin 102 | VDDIO β IO voltage supply |
| Pin 103 | RESETn β Reset input, active low |
| Pin 104 | SWDIO β SWD data (debug) |
| Pin 105 | SWCLK β SWD clock (debug) |
| Pin 106 | XTAL32K_IN β 32.768 kHz crystal input |
| Pin 107 | XTAL32K_OUT β 32.768 kHz crystal output |
| Pin 108 | XTAL_IN β Main crystal input |
| Pin 109 | XTAL_OUT β Main crystal output |
| Pin 110 | VSW β Internal DCDC switching node |
| Pin 111 | VDDIO β IO voltage supply |
| Pin 112 | AUX β AUX power pin |
| Pin 113 | PD20 β GPIO |
| Pin 114 | PD21 β GPIO |
| Pin 115 | GND β Ground |
| Pin 116 | PA27 β GPIO / SERCOM0.3 |
| Pin 117 | PA28 β GPIO / SERCOM0.0 |
| Pin 118 | PA29 β GPIO / SERCOM0.1 |
| Pin 119 | PA30 β GPIO / SERCOM0.2 |
| Pin 120 | PA31 β GPIO / SERCOM0.3 |
| Pin 121 | PB24 β GPIO / SERCOM0.0 |
| Pin 122 | PB25 β GPIO / SERCOM0.1 |
| Pin 123 | PB26 β GPIO / SERCOM0.2 |
| Pin 124 | PB27 β GPIO / SERCOM0.3 |
| Pin 125 | PC22 β GPIO |
| Pin 126 | PC23 β GPIO |
| Pin 127 | GND β Ground |
| Pin 128 | VDDPLL β PLL analog supply |
Typical Applications
ATSAMD51P19A-AFT is suitable for 6 applications: USB Audio Class (UAC) Sound Card, Industrial Sensor Aggregation / IoT Gateway, BLDC Motor Field-Oriented Control (FOC), HMI Panel with TFT Touch Display, Secure-Connected Consumer Device with OTA, Portable Data Acquisition / Test Instrument.
USB Audio Class (UAC) Sound Card
The ATSAMD51P19A-AFT is a strong fit for USB Audio Class (UAC) sound cards because its 120 MHz Cortex-M4F core sustains 48 kHz / 24-bit stereo processing with margin for FX. The integrated USB 2.0 Full-Speed controller with on-chip PHY eliminates the need for an external transceiver, while the I2S peripheral streams audio to an external DAC such as the S/PDIF output stage. The 192 KB SRAM (plus 8 KB TCM) provides comfortable buffering for double-buffered audio frames, and the DMA controller offloads USB-to-I2S transfers, freeing the M4F core for DSP filtering and volume control.
Recommended
Industrial Sensor Aggregation / IoT Gateway
For industrial sensor aggregation, the ATSAMD51P19A-AFT integrates dual CAN-FD controllers for chassis-level networking, 12-bit 1 MSPS ADC channels for analog sensor sampling, and up to eight SERCOM peripherals configurable as UART, SPI, or I2C for digital sensor interfacing. The 120 MHz M4F allows aggregation of multiple sensor streams with on-the-fly FFT or moving-average filtering before forwarding through CAN or USB. Hardware AES/SHA/TRNG supports OTA firmware integrity verification at the edge. The 128-TQFP exposes ample GPIO for parallel display or keypad IO on industrial HMI panels.
Recommended
BLDC Motor Field-Oriented Control (FOC)
The ATSAMD51P19A-AFT fits BLDC motor FOC drives because the Cortex-M4F single-precision FPU executes the Park/Clarke transforms and PID loops at 120 MHz with deterministic cycle time, supported by 16-bit PWM timers with complementary outputs and dead-time insertion. The 12-bit 1 MSPS ADC synchronizes with PWM for back-EMF and phase-current sensing, while the Event System routes fault signals with deterministic sub-microsecond latency. Dual CAN-FD serves industrial drive buses like CANopen. The 192 KB SRAM holds observed current/voltage tables for diagnostics, and the AES engine secures motor parameter write access.
Recommended
HMI Panel with TFT Touch Display
The ATSAMD51P19A-AFT drives TFT LCDs with capacitive touch via the Parallel Capture Interface (PCL) and SMC, while the Cortex-M4F core runs LVGL/Embedded Wizard graphics libraries at 120 MHz for responsive UI rendering. The integrated 2 MB HSRAM subsystem (selectable 384 KB) supplies enough framebuffer memory for 480x272 RGB565 frames without external SRAM. USB Full-Speed enables HID touch-class HID interfacing and firmware DFU updates. Hardware SHA-256 verifies signed GUI assets at boot, supporting tamper-resistant HMI deployments in industrial controllers and medical instrument panels.
Recommended
Secure-Connected Consumer Device with OTA
The ATSAMD51P19A-AFT supports secure consumer products with over-the-air (OTA) firmware updates through its hardware AES-256, SHA-256, and True Random Number Generator. The 512 KB dual-panel Flash allows live firmware swap without external EEPROM emulation: one panel executes while the other downloads and verifies a new image. Wi-Fi companion modules (e.g., ATWINC3400) interface via SPI to one of the SERCOM peripherals. The Cortex-M4F core handles TLS handshake acceleration and application logic. The 128 TQFP keeps the design single-sided, suitable for wearable enclosures.
Recommended
Portable Data Acquisition / Test Instrument
In portable data acquisition and bench instruments, the ATSAMD51P19A-AFT combines a 120 MHz Cortex-M4F core (with FPU for FIR/IIR filtering), 12-bit 1 MSPS ADC with up to 16 channels, and a high-speed USB 2.0 Full-Speed device interface for streaming captures to a host PC. The 192 KB SRAM and SERCOM peripherals allow simultaneous analog sampling, GPS time-tagging, and SD-card storage of acquisition runs. Hardware AES can encrypt sensitive captured data at rest. The industrial -40C to +125C temperature range and 128-TQFP footprint suit handheld bench instruments fielded in lab or production environments.
Recommended
Recommended Products Summary
Engineering reference data for ATSAMD51P19A-AFT β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAME54P19A-AFT | ATSAMD51P20A-AFT | ATSAMD51P19A-AUT | ATSAMD51P19A-AF | ATSAMD51P19A-CFT |
|---|---|---|---|---|---|---|
| Package | 128-TQFP (14x14) | 128-TQFP (14x14) - same | 128-TQFP (14x14) - same | 128-TQFP (14x14) - same | 128-TQFP (14x14) - same | 128-TQFP (14x14) - same |
| Brand | Microchip Technology | 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) | ARM Cortex-M4F (120 MHz) |
| Flash | 512 KB | 512 KB (1 MB family option) | 1 MB | 512 KB | 512 KB | 512 KB |
| SRAM | 192 KB | 256 KB | 192 KB | 192 KB | 192 KB | 192 KB |
| Operating Temperature | -40C to +125C (industrial) | -40C to +125C | -40C to +125C | -40C to +85C (commercial) | -40C to +125C | -40C to +125C |
| CAN-FD | 2 controllers | 1 controller | 2 controllers | 2 controllers | 2 controllers | 2 controllers |
| USB FS | Yes (integrated PHY) | Yes (integrated PHY) | Yes (integrated PHY) | Yes (integrated PHY) | Yes (integrated PHY) | Yes (integrated PHY) |
| Ethernet MAC | No | Yes (10/100) | No | No | No | No |
| 1-Piece Price (USD, as of 2026-09-21) | 9.84 | 10.20 (approx) | 10.85 (approx) | 9.84 (same die, reel) | 9.95 (tray variant) | 10.10 (approx) |
Key Differentiators
- Native dual CAN-FD + USB Audio + Ethernet-class peripheral set (vs ATSAME54P19A-AFT)
- 512 KB Flash single-panel density sweet spot (vs ATSAMD51P20A-AFT)
- Industrial -40C to +125C temperature grade with T&R option (vs ATSAMD51P19A-AUT)
Design Notes
The ATSAMD51P19A-AFT integrates a 1.2V internal DCDC regulator (VSW pin 110) that converts VDDIO 3.3V to VDDCORE. Place a 4.7uF ceramic capacitor as close as possible to VSW and a 1uF ceramic on VDDCORE (pin 101) to comply with the regulator stability requirements. For noise-sensitive analog workloads (e.g., driving the 12-bit ADC), enable the internal DFLL bypass or feed the ADC with a dedicated low-noise LDO such as the MCP1711 to reach datasheet SNR figures.
Route the USB_DP (PA25) and USB_DM (PA24) lines as a 90-ohm differential pair on the top layer, with the pair length matched within 150 mil. Place the ESD protection diode (e.g., PRTR5V0U2X) within 5 mm of the USB connector. Keep the 32.768 kHz crystal traces short and symmetric, surrounded by a ground pour to minimize load capacitance drift that affects RTC accuracy. Avoid routing high-current switching traces under the crystal.
Estimated: at 120 MHz with active M4F core, all peripherals enabled, and CAN-FD transceivers driven at 5 Mbps, the VDDCORE current peaks near 80 mA. With only the onboard DCDC supplying 1.2V from 3.3V, the input-side current peaks near 30 mA (efficiency ~85%) - the 4.7uF ceramic at VSW must handle this ripple without significant voltage droop. Also note: the NMI pin is multiplexed and must not be left floating at boot or the bootloader may mis-behave; tie NMI to VDDIO through a 100k pull-up if unused.
At 120 MHz continuous operation with all peripherals active, junction-to-ambient thermal resistance (theta_JA) for the 128-TQFP is approximately 32 C/W on a 4-layer JEDEC PCB. At 25C ambient, junction temperature rises by an estimated 0.75 C per mW above ambient - within the industrial -40 to +125C spec for typical workloads. For high-utilization use, ensure at least 1 square inch of unbroken ground copper beneath the TQFP thermal pad region to keep junction rise below 30C.
Compliance Information
AEC-Q100 not qualified - the standard -AFT suffix is industrial temperature, not automotive. For body/chassis CAN-FD applications, verify AEC-Q100 qualification with the specific ordering code (no -Q1 suffix on this MPN).
