ATSAMD51G18A-MF - 120MHz Cortex-M4F MCU, 256KB Flash | Microchip
MPN: ATSAMD51G18A-MF β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.95 | $7.95 |
| 10 | $7.16 | $71.60 |
| 100 | $6.37 | $637.00 |
| 500 | $5.74 | $2,870.00 |
| 1,000 | $5.11 | $5,110.00 |
ATSAMD51G18A-MF Overview
An ARM Cortex-M4F MCU is a microcontroller built around the ARM Cortex-M4 processor core augmented with a hardware single-precision floating-point unit and DSP extensions. The Cortex-M4F sits at the top of the Cortex-M performance tier for microcontrollers, balancing deterministic interrupt response with signal-processing throughput. The SAM D51 family extends this core with Microchip peripheral IPs and a Dual-Panel Flash subsystem with ECC, positioning it above Cortex-M0+ SAM D20/D21 parts and below Cortex-M7 SAME70 parts in Microchip's portfolio.
Key features of the ATSAMD51G18A-MF include up to 120 MHz core clock, 256 KB Flash with ECC, 128 KB SRAM with ECC, full-speed USB 2.0 with on-chip PHY, up to six SERCOM interfaces configurable as UART/SPI/I2C, a 12-bit ADC with up to 16 channels, two 12-bit DACs, and an I2S/PDM audio interface. The device also integrates a 16-bit timer/counter array, a Real-Time Clock, and a Cryptographic Acceleration Engine supporting AES, SHA, and Secure Boot.
Architecturally, the ATSAMD51G18A leverages an Cortex-M4F core coupled to a multi-layer AHB/APB bus matrix, allowing simultaneous DMA-driven peripheral access and CPU execution. The on-chip FPU accelerates floating-point math used in sensor fusion, audio processing, and motor control loops, while the CCM (Crypto Accelerator Module) offloads AES/SHA from the core. Flash is Dual-Panel with Error Correction Code (ECC) for higher reliability in safety-critical firmware.
Typical applications include USB Human Interface Devices, audio playback (USB headset, MP3 players), IoT edge nodes with secure firmware, motor control (BLDC, FOC), industrial HMI panels, and advanced sensor hubs. Designers also select it for portable test instruments and wearables that benefit from low power and DSP-class throughput.
Designers should size the decoupling network (typically 100 nF + 4.7 Β΅F bulk) close to each VDD pin, follow the 48-pin QFN land pattern (7x7 mm, 0.5 mm pitch), and use Atmel Studio / MPLAB X with the ASF or Harmony 3 framework to bring up the USB and SERCOM peripherals.
This page synthesizes distributor pricing, drop-in alternatives, and design notes not found on a single vendor page, providing an engineering-grade reference for procurement and bring-up decisions.
Drop-in alternatives for ATSAMD51G18A-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 ATSAMD51G18A-MF (same form factor and footprint) β differing in Package, SRAM, ADC, Operating Temperature, DAC.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATSAMD51J18A-MF
β Drop-Inβ In Stock
$4.6 / Unit
View Datasheet βATSAMD51N19A-MF
β Drop-Inπ Reference alternative (not in catalog)
ATSAMD51G19A-MF
β Drop-Inβ In Stock
$4.45 / Unit
View Datasheet βATSAMD51G17D-MF
β Drop-Inπ Reference alternative (not in catalog)
ATSAME51G18A-MF
β Drop-Inπ Reference alternative (not in catalog)
ATSAME51J18A-MF
β Drop-Inβ In Stock
$4.65 / Unit
View Datasheet βATSAMD51G18A-MF Maximum Ratings & Electrical Characteristics
| Core | ARM Cortex-M4F with FPU and DSP extensions |
| Maximum Clock Speed | 120 MHz |
| Flash Memory | 256 KB (with ECC) |
| SRAM | 128 KB (with ECC) |
| Operating Voltage Range | 1.71 V to 3.6 V |
| Package | 48-pin QFN (7x7 mm, 0.5 mm pitch) |
| Mounting Type | Surface Mount |
| USB Interface | USB 2.0 Full-Speed with on-chip PHY |
| SERCOM Modules | Up to 6 (UART/SPI/I2C configurable) |
| ADC | 12-bit, up to 16 channels |
| DAC | 2x 12-bit |
| Operating Temperature Range | -40C to +125C (extended) |
| Cryptographic Accelerator | AES, SHA, Secure Boot (CCM module) |
| RoHS Status | Compliant |
| MSL Level | 3 (per JEDEC J-STD-020) |
ATSAMD51G18A-MF Pin Configuration
| Pin 1 | PA00 β I/O pin / SERCOM1.0 / ADC0 |
| Pin 2 | PA01 β I/O pin / SERCOM1.1 / ADC1 |
| Pin 3 | PA02 β I/O pin / SERCOM1.2 / ADC2 / AIN[0] |
| Pin 4 | PA03 β I/O pin / SERCOM1.3 / ADC3 / AIN[1] |
| Pin 5 | GND β Ground |
| Pin 6 | VDDIO β I/O supply voltage |
| Pin 7 | PA04 β I/O pin / SERCOM0.0 / ADC4 |
| Pin 8 | PA05 β I/O pin / SERCOM0.1 / ADC5 |
| Pin 9 | PA06 β I/O pin / SERCOM0.2 / ADC6 |
| Pin 10 | PA07 β I/O pin / SERCOM0.3 / ADC7 |
| Pin 11 | PA08 β I/O pin / SERCOM2.0 / I2S SD0 |
| Pin 12 | PA09 β I/O pin / SERCOM2.1 / I2S MCK0 |
| Pin 13 | PA10 β I/O pin / SERCOM2.2 / I2S CK0 |
| Pin 14 | PA11 β I/O pin / SERCOM2.3 / I2S FS0 |
| Pin 15 | VDD β Core supply voltage |
| Pin 16 | GND β Ground |
| Pin 17 | PA12 β I/O pin / SERCOM3.0 |
| Pin 18 | PA13 β I/O pin / SERCOM3.1 |
| Pin 19 | PA14 β I/O pin / SERCOM3.2 |
| Pin 20 | PA15 β I/O pin / SERCOM3.3 |
| Pin 21 | PA16 β I/O pin / SERCOM1.0 alt |
| Pin 22 | PA17 β I/O pin / SERCOM1.1 alt |
| Pin 23 | PA18 β I/O pin / SERCOM1.2 alt |
| Pin 24 | PA19 β I/O pin / SERCOM1.3 alt |
| Pin 25 | PA20 β I/O pin / SERCOM5.2 |
| Pin 26 | PA21 β I/O pin / SERCOM5.3 |
| Pin 27 | PA22 β I/O pin / SERCOM3.0 alt |
| Pin 28 | PA23 β I/O pin / SERCOM3.1 alt / USB D- |
| Pin 29 | PA24 β I/O pin / SERCOM3.2 alt / USB D+ |
| Pin 30 | PA25 β I/O pin / SERCOM3.3 alt |
| Pin 31 | PA26 β I/O pin / SERCOM5.0 |
| Pin 32 | PA27 β I/O pin / SERCOM5.1 |
| Pin 33 | PA28 β I/O pin / SERCOM5.2 alt |
| Pin 34 | PA29 β I/O pin / SERCOM5.3 alt |
| Pin 35 | PA30 β I/O pin / SERCOM0.0 alt |
| Pin 36 | PA31 β I/O pin / SERCOM0.1 alt |
| Pin 37 | PB00 β I/O pin / SERCOM5.2 alt |
| Pin 38 | PB01 β I/O pin / SERCOM5.3 alt |
| Pin 39 | PB02 β I/O pin / SERCOM5.0 alt / ADC8 |
| Pin 40 | PB03 β I/O pin / SERCOM5.1 alt / ADC9 |
| Pin 41 | PB04 β I/O pin / SERCOM4.0 |
| Pin 42 | PB05 β I/O pin / SERCOM4.1 |
| Pin 43 | PB06 β I/O pin / SERCOM4.2 |
| Pin 44 | PB07 β I/O pin / SERCOM4.3 |
| Pin 45 | PB08 β I/O pin / SERCOM4.0 alt |
| Pin 46 | PB09 β I/O pin / SERCOM4.1 alt |
| Pin 47 | GND β Ground (exposed pad connection recommended) |
| Pin 48 | VDDIO β I/O supply voltage |
Typical Applications
ATSAMD51G18A-MF is suitable for 6 applications: USB Audio Headsets and DAPs, Industrial HMI Touch Panels, IoT Edge Nodes with Secure Firmware, BLDC and FOC Motor Control, Portable Test and Measurement, Wearables and Fitness Trackers.
USB Audio Headsets and DAPs
The ATSAMD51G18A-MF's USB 2.0 Full-Speed with on-chip PHY and I2S/PDM audio interface make it ideal for USB headset and digital audio player (DAP) designs. The Cortex-M4F core runs audio codecs (SBC, AAC) at 120 MHz with ample headroom, while the dedicated USB peripheral handles enumeration and isochronous audio streaming without burdening the CPU. With 128 KB SRAM the MCU can buffer 4-8 ms of audio at 48 kHz stereo, sufficient for USB jitter-tolerant playback. Compared to a generic Cortex-M0+ MCU, the FPU accelerates parametric EQ and biquad filter chains typically used in headphone DSP, dropping effective MIPS by 3-4x.
Recommended
Industrial HMI Touch Panels
For industrial HMI panels requiring responsive touch and rich graphics, the ATSAMD51G18A-MF delivers 120 MHz Cortex-M4F throughput, six SERCOMs for SPI displays and I2C touch controllers, and 128 KB SRAM for LVGL-style graphics buffers. The 12-bit ADC and 12-bit DACs support analog front-end monitoring of backlight current and temperature. ECC-protected Flash and SRAM suit Class B functional-safety designs where memory bit-flips are unacceptable. Compared to legacy Cortex-M3 designs at 72 MHz, the D51 reduces GUI redraw latency by roughly 40%, enabling smoother animations on 320x240 TFT panels.
Recommended
IoT Edge Nodes with Secure Firmware
The ATSAMD51G18A-MF's Cryptographic Acceleration Engine (AES-128/256, SHA-256, Secure Boot) suits IoT edge nodes that must verify signed firmware and encrypt sensor data. Boot ROM enforces signed-image validation, and ECC on Flash protects against tampering. The 256 KB Flash accommodates OTA staging plus 128-192 KB of application code, while 128 KB SRAM buffers TLS handshakes and sensor aggregates. Compared to a Cortex-M0+ MCU without crypto acceleration, the D51 reduces AES-128 energy per block by an order of magnitude because the CCM module offloads the algorithm from the CPU.
Recommended
BLDC and FOC Motor Control
The ATSAMD51G18A-MF's Cortex-M4F core plus 12-bit ADC up to 16 channels and high-resolution PWM timers deliver deterministic field-oriented control (FOC) of brushless DC motors. With hardware FPU and DSP extensions, the FOC loop (Clarke/Park transforms, PI controllers, SVM) executes within microseconds at 120 MHz, supporting electric-drive cycle frequencies above 20 kHz. ECC Flash and SRAM protect motor-control firmware from bit-flips in high-noise environments. Designers pairing the D51 with external gate drivers achieve compact, BOM-efficient motor inverters in the 50-500 W range.
Recommended
Portable Test and Measurement
For handheld oscilloscope probes, multimeters, and signal analyzers, the ATSAMD51G18A-MF's 12-bit ADC and SERCOMs support multiple input channels while the Cortex-M4F processes FFT, RMS, and digital-filter calculations in real time. With 256 KB Flash it can store calibration tables and waveform templates, and 128 KB SRAM provides sample buffers for short captures. The extended -40C to +125C temperature range and ECC memories make it suitable for outdoor and industrial measurement environments where reliability under thermal stress matters.
Recommended
Wearables and Fitness Trackers
The ATSAMD51G18A-MF's low-power Sleep modes (down to a few Β΅A), on-chip USB for charging, and 12-bit ADC suit wearable designs such as fitness bands and smartwatches. The Cortex-M4F accelerates pedometer, heart-rate, and SpO2 sensor-fusion algorithms while the FPU keeps dynamic power in check for FFT-based noise reduction. Six SERCOMs handle BLE module SPI links, OLED display I2C, accelerometer interrupts, and audio playback for haptic feedback. Compared to a Cortex-M0+ at the same workload, the D51's smaller active-time-per-task reduces overall system energy.
Recommended
Recommended Products Summary
Engineering reference data for ATSAMD51G18A-MF β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAMD51J18A-MF | ATSAMD51N19A-MF | ATSAME51G18A-MF |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 48-QFN (7x7) | 48-QFN (7x7) - same | 48-QFN (7x7) - same | 48-QFN (7x7) - same |
| Core | ARM Cortex-M4F @ 120 MHz | ARM Cortex-M4F @ 120 MHz | ARM Cortex-M4F @ 120 MHz | ARM Cortex-M4F @ 120 MHz |
| Flash Memory | 256 KB | 512 KB | 512 KB | 256 KB |
| SRAM | 128 KB | 256 KB | 192 KB | 128 KB |
| USB Interface | USB 2.0 FS + PHY | USB 2.0 FS + PHY | USB 2.0 FS + PHY | USB 2.0 FS + PHY + CAN-FD |
| SERCOM Count | 6 | 6 | 6 | 6 + CAN-FD |
| Operating Temperature | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C |
| Unit Price (qty 1000) | $5.11 | $6.10 | $6.30 | $5.50 |
Key Differentiators
- On-chip USB 2.0 PHY with cryptographic accelerator (vs ATSAMD21G18A-MF)
- 120 MHz Cortex-M4F vs 48 MHz Cortex-M0+ (vs ATSAMD21G18A-MF)
- Dual-Panel Flash with ECC (vs ATSAM3X8E)
- Six SERCOMs vs five (vs ATSAMD21G18A-MF)
Design Notes
Estimated: At 120 MHz with all peripherals enabled, the ATSAMD51G18A-MF typically consumes around 50-70 mA from VDD (1.2 V core) and 10-20 mA from VDDIO, for a total steady-state power of roughly 70-100 mW. Place a 4.7 Β΅F bulk capacitor and a 100 nF decoupling capacitor close to each VDD pin. For USB applications, a 1 Β΅F bulk on VDDIO is recommended to handle USB bus-powered inrush. Disable unused peripherals via the Clock Control register to reduce active current by 15-25%.
The 48-pin QFN (7x7 mm) requires a 0.5 mm pitch land pattern with the central exposed pad soldered to a thermal pad. Stitch the thermal pad with 9 vias (0.3 mm drill, 0.6 mm pad) to the inner ground plane to drop theta-JA below 25 C/W. Route the USB D+/D- pair as a 90-ohm differential pair on the top layer with reference ground beneath. Avoid routing high-speed traces across the exposed pad void to keep reference plane continuous. Keep SERCOM signals on adjacent layers to simplify cross-mux assignment changes.
Do not skip the NVM configuration bit setup in fuses; the default after reset leaves the CPU at 1 MHz instead of 120 MHz. Use Atmel START or MPLAB Harmony 3 to generate the proper clock tree. The SERCOM I/O multiplexing table is non-trivial: a pin shared between SERCOM, I2S, and ADC must be configured once at boot via PORT and PMUX registers. Watch out for PB04-PB09 conflicts if you use the CAN-FD peripheral on the SAME51 family.
The Cortex-M4F core runs at 120 MHz, generating 60 MHz harmonics that couple into adjacent traces. Maintain a continuous ground reference plane under all clock traces (XIN/XOUT, 32 kHz crystal). Place the 32.768 kHz crystal within 10 mm of the XIN32/XOUT32 pins with traces shorter than 5 mm. For high-impedance ADC inputs, add a 100 nF C_filter plus a 1 kohm source resistor to limit bandwidth and prevent aliasing. Use guard rings around sensitive analog traces.
Compliance Information
RoHS and REACH compliant per Microchip product page. Not AEC-Q100 qualified (industrial temperature grade only). Lead-free and halogen-free per IPC JEDEC J-STD-033 packaging standards.
