ATSAMD51G18A-MU-EFP - 120MHz M4F MCU, 256KB Flash, USB | Microchip
MPN: ATSAMD51G18A-MU-EFP ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.27 | $8.27 |
| 10 | $7.36 | $73.60 |
| 100 | $6.32 | $632.00 |
| 500 | $5.52 | $2,760.00 |
| 1,000 | $4.94 | $4,940.00 |
ATSAMD51G18A-MU-EFP Overview
A microcontroller (MCU) is a single-chip processor that integrates CPU, memory, and peripherals; the ARM Cortex-M4F variant adds a single-precision Floating Point Unit and DSP extensions, enabling real-time DSP workloads on an MCU rather than a more expensive DSP chip. The SAM D51 family sits at the high-performance end of Microchip's Cortex-M4 lineup, targeting applications that previously required a Cortex-M7 or external DSP.
Key features include 120 MHz CPU with FPU, 256 KB Flash in dual-panel configuration with ECC, 128 KB SRAM with ECC, integrated USB 2.0 Full-Speed PHY, a 12-bit 1 MSPS ADC with up to 16 channels, two 12-bit DAC outputs, six SERCOM (SERial COMmunication) modules that can be configured as UART, SPI, or I2C, an I2S interface for digital audio, six 16-bit timers, and a Cryptographic Accelerator supporting AES and SHA. The dual-panel Flash with ECC gives improved reliability versus single-panel Flash.
The architecture combines a Cortex-M4F core from ARM with Microchip's peripheral set, fabricated on a low-power process that supports active, idle, standby, and backup sleep modes with RTC running from a 32.768 kHz crystal. The integrated USB PHY eliminates the need for an external USB transceiver, reducing BOM cost and PCB area for USB-enabled designs.
Typical applications include USB human-interface devices (HID) such as keyboards and game controllers, audio processing with USB streaming, industrial sensor hubs, motor control, and IoT edge nodes with cryptography. The Cortex-M4F DSP extensions accelerate sensor-fusion algorithms and audio processing.
When designing with this device, the integrated USB PHY requires careful PCB layout - follow the USB differential pair impedance (90 ohms differential) and length matching rules in the datasheet. Adequate decoupling is also critical: place 100 nF and 1 uF MLCC bypass capacitors near each VDD pin and one bulk capacitor on the AVDD rail to suppress ADC noise.
This page synthesizes distributor pricing, same-package drop-in alternatives, application reference designs, and practical PCB design notes sourced from the manufacturer datasheet and DigiKey/Mouser product pages.
Drop-in alternatives for ATSAMD51G18A-MU-EFP — 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-MU-EFP (same form factor and footprint) — differing in Package, DAC, SRAM, ADC, Core.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAMD51G18A-MF
✅ Drop-In✓ In Stock
$5.11 / Unit
View Datasheet →ATSAMD51G18A-MFT
✅ Drop-In✓ In Stock
$3.55 / Unit
View Datasheet →ATSAMD51J19A-MU
✅ Drop-In✓ In Stock
$6.1 / Unit
View Datasheet →ATSAMD51J20A-MU
✅ Drop-In✓ In Stock
$4.75 / Unit
View Datasheet →ATSAME51G18A-MU
✅ Drop-In✓ In Stock
$4.35 / Unit
View Datasheet →ATSAME51J19A-MU
✅ Drop-In✓ In Stock
$4.65 / Unit
View Datasheet →ATSAMD51G18A-MU-EFP Maximum Ratings & Electrical Characteristics
| Core | ARM Cortex-M4F with FPU and DSP extensions |
| Maximum CPU Frequency | 120 MHz |
| Program Flash Memory | 256 KB (256K x 8), dual-panel Flash with ECC |
| SRAM | 128 KB with ECC |
| Supply Voltage (VDD) | 1.71 V to 3.63 V |
| I/O Voltage | 3.3 V typical |
| USB | USB 2.0 Full-Speed Device/Host with integrated PHY |
| ADC | 12-bit, up to 1 MSPS |
| DAC | 2 x 12-bit |
| SERCOM Modules | 6 (configurable as UART, SPI, or I2C) |
| I2S | Yes (1 channel) |
| Timers | 6 x 16-bit |
| Cryptographic Accelerator | AES, SHA |
| Operating Temperature | -40 C to +85 C (industrial) |
| Package | 48-pin VQFN (7x7 mm), wettable flanks |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
ATSAMD51G18A-MU-EFP Pin Configuration
| Pin 1 | VBUS — USB VBUS sense |
| Pin 2 | DM — USB D- data line |
| Pin 3 | DP — USB D+ data line |
| Pin 4 | VDDIO — I/O supply voltage |
| Pin 5 | GND — Ground |
| Pin 6 | PA00 — GPIO / ADC0 / INT0 |
| Pin 7 | PA01 — GPIO / ADC1 |
| Pin 8 | PA02 — GPIO / ADC2 |
| Pin 9 | PA03 — GPIO / ADC3 |
| Pin 10 | GND — Ground |
| Pin 11 | PA04 — GPIO / ADC4 / VREFB |
| Pin 12 | PA05 — GPIO / ADC5 |
| Pin 13 | PA06 — GPIO / ADC6 |
| Pin 14 | PA07 — GPIO / ADC7 |
| Pin 15 | VDDCORE — Internal 1.2 V core supply decoupling |
| Pin 16 | PA08 — GPIO / ADC8 / I2S SCK |
| Pin 17 | PA09 — GPIO / ADC9 / I2S WS |
| Pin 18 | PA10 — GPIO / ADC10 |
| Pin 19 | PA11 — GPIO / ADC11 |
| Pin 20 | GND — Ground |
| Pin 21 | PB00 — GPIO / ADC12 |
| Pin 22 | PB01 — GPIO / ADC13 |
| Pin 23 | PB02 — GPIO / ADC14 |
| Pin 24 | PB03 — GPIO / ADC15 |
| Pin 25 | PB04 — GPIO |
| Pin 26 | PB05 — GPIO |
| Pin 27 | PB06 — GPIO |
| Pin 28 | PB07 — GPIO |
| Pin 29 | PB08 — GPIO |
| Pin 30 | PB09 — GPIO |
| Pin 31 | PB10 — GPIO |
| Pin 32 | PB11 — GPIO |
| Pin 33 | VDDIO — I/O supply voltage |
| Pin 34 | GND — Ground |
| Pin 35 | PC00 — GPIO |
| Pin 36 | PC01 — GPIO |
| Pin 37 | PC02 — GPIO |
| Pin 38 | PC03 — GPIO |
| Pin 39 | PC04 — GPIO |
| Pin 40 | PC05 — GPIO |
| Pin 41 | PC06 — GPIO |
| Pin 42 | PC07 — GPIO |
| Pin 43 | PC08 — GPIO |
| Pin 44 | PC09 — GPIO |
| Pin 45 | XIN — Crystal oscillator input |
| Pin 46 | XOUT — Crystal oscillator output |
| Pin 47 | RESET — Reset input, active-low |
| Pin 48 | NC — No-connect or EPAD tied to GND |
Typical Applications
ATSAMD51G18A-MU-EFP is suitable for 7 applications: USB Human Interface Devices (HID), Audio Processing & USB Audio Streaming, Industrial Sensor Hubs and IoT Edge Nodes, Motor Control and BLDC/PMSM Drives, Home Automation and Smart Home Bridges, Medical and Wearable Devices, Test & Measurement Portable Instruments.
USB Human Interface Devices (HID)
The ATSAMD51G18A-MU-EFP's integrated USB 2.0 Full-Speed PHY with on-chip transceiver makes it a natural fit for USB HID products. At 120 MHz the Cortex-M4F core can execute USB stack and HID report processing in tens of microseconds, leaving headroom for Matrix-scanning firmware on as many as 81 GPIO lines. The 256 KB dual-panel Flash enables runtime firmware updates over USB without halting the user-visible device, while the 1 uF and 100 nF decoupling network per VDD pin (per the SAM D51 datasheet PCB layout guide) ensures clean USB DP/DM signaling.
Recommended
Audio Processing & USB Audio Streaming
The 120 MHz Cortex-M4F core plus integrated I2S peripheral and dual 12-bit DACs make ATSAMD51G18A-MU-EFP suitable for USB audio playback devices. The M4F's single-precision FPU accelerates biquad and dynamics-processing algorithms in real time at 48 kHz sample rate, while the 128 KB SRAM buffers audio packets without intervention. The integrated USB Full-Speed PHY supports USB Audio Class 1.0 without an external transceiver, simplifying the BOM. Per the datasheet, route the I2S lines as a matched-length group of three (BCLK, LRCK, DATA) and place the audio DAC close to the MCU's AVDD pin.
Recommended
Industrial Sensor Hubs and IoT Edge Nodes
With six SERCOM modules (each configurable as UART/SPI/I2C), the ATSAMD51G18A-MU-EFP can aggregate data from many sensors simultaneously, while the Cortex-M4F runs sensor-fusion algorithms (Madgwick, Mahony) at full sensor update rate. The integrated Cryptographic Accelerator (AES/SHA) secures TLS handshakes and firmware signatures for IoT trust requirements. Operating from -40 C to +85 C industrial temperature, the part suits factory-floor sensor hubs and outdoor IoT gateways. The SAM D51's SleepWalking peripheral wakes only the timers and SERCOM needed for the next acquisition, dropping quiescent current to microamps.
Recommended
Motor Control and BLDC/PMSM Drives
The six 16-bit timers with PWM outputs, combined with the Cortex-M4F DSP extensions, position ATSAMD51G18A-MU-EFP for sensorless BLDC and PMSM motor control. The single-precision FPU accelerates Park/Clarke transforms and PI controllers at tens of microsecond control-loop periods. The SAM D51's high-speed ADC (1 MSPS at 12-bit) simultaneously samples all three phase currents plus DC-bus voltage for field-oriented control. The integrated USB PHY allows runtime tuning of motor parameters from a host PC GUI.
Recommended
Home Automation and Smart Home Bridges
The ATSAMD51G18A-MU-EFP serves as a smart-home bridge between USB, Wi-Fi, Zigbee, and Bluetooth modules through its six SERCOM interfaces. At 120 MHz with 256 KB Flash, the M4F runs simultaneous protocols (MQTT, BLE GATT, Zigbee 3.0). The hardware AES-256 accelerator encrypts local storage and over-the-air firmware updates. Per the datasheet's USB application note, the integrated USB Device port can also act as a debugging console during development.
Recommended
Medical and Wearable Devices
With the M4F's DSP extensions accelerating heart-rate and SpO2 algorithms, the ATSAMD51G18A-MU-EFP is well-suited for wearable fitness and medical-monitoring devices. The 12-bit 1 MSPS ADC captures photoplethysmography (PPG) waveforms at the needed sample rate, while the integrated USB PHY supports charging and data sync. Backup Sleep mode with RTC at microamp-level quiescent current extends battery life between charges.
Recommended
Test & Measurement Portable Instruments
The 120 MHz Cortex-M4F with FPU enables real-time FFT, RMS, and statistical calculations on streamed ADC samples for portable oscilloscopes and multimeters. The 256 KB Flash stores calibration tables and user interfaces, while the integrated USB Device port streams measurement data to a host PC. With six SERCOM interfaces, the part interfaces simultaneously with display, keyboard, ADC front-end, and external reference chips.
Recommended
Recommended Products Summary
Engineering reference data for ATSAMD51G18A-MU-EFP — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAMD51G18A-MF | ATSAMD51G18A-MFT | ATSAMD51J19A-MU | ATSAMD51J20A-MU | ATSAME51G18A-MU | ATSAME51J19A-MU |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | VQFN-48 (7x7 mm) | VQFN-48 - same | VQFN-48 - same | VQFN-48 - same | VQFN-48 - same | VQFN-48 - same | VQFN-48 - same |
| Core | Cortex-M4F | Cortex-M4F | Cortex-M4F | Cortex-M4F | Cortex-M4F | Cortex-M4F | Cortex-M4F |
| Maximum Frequency | 120 MHz | 120 MHz | 120 MHz | 120 MHz | 120 MHz | 120 MHz | 120 MHz |
| Flash Memory | 256 KB | 64 KB | 256 KB | 512 KB | 1 MB | 256 KB | 512 KB |
| SRAM | 128 KB | 32 KB | 128 KB | 192 KB | 256 KB | 128 KB | 192 KB |
| USB PHY | USB 2.0 Full-Speed Device/Host | USB 2.0 Full-Speed | USB 2.0 Full-Speed | USB 2.0 Full-Speed | USB 2.0 Full-Speed | USB 2.0 Full-Speed | USB 2.0 Full-Speed Device only |
| Cryptographic Accelerator | AES-128, AES-256, SHA-256, TRNG | AES, SHA, TRNG | AES, SHA, TRNG | AES, SHA, TRNG | AES, SHA, TRNG | None | None |
| CAN Interface | No | No | No | No | No | CAN-FD | CAN-FD |
Key Differentiators
- Largest Flash in the SAM D51 G-varient family at this 48-VQFN position (vs ATSAMD51G18A-MF)
- Pin-compatible upgrade path to 512 KB Flash without PCB redesign (vs ATSAMD51J19A-MU)
- Cryptographic Accelerator for hardware-accelerated TLS (vs ATSAME51G18A-MU)
Design Notes
The integrated USB Full-Speed PHY requires careful PCB layout: route the USB DP and DM traces as a 90-ohm differential pair with length matching to within 150 mil, place the ESD protection diode within 5 mm of the USB connector, and keep the differential pair clear of digital switching signals. Per the SAM D51 datasheet PCB layout guidelines, the 4-layer stackup is strongly recommended with a solid ground plane under the USB traces.
Place a 100 nF ceramic decoupling capacitor within 5 mm of every VDD and VDDCORE pin, plus one 1 uF bulk capacitor per supply rail. The AVDD pin (analog supply) should be filtered with a ferrite bead or 10 ohm resistor from VDDIO plus 100 nF and 10 uF local capacitance to minimize ADC noise. Without this decoupling the 12-bit ADC can degrade to 9-bit effective resolution under high CPU load.
At 120 MHz CPU clock with all peripherals active, the ATSAMD51G18A-MU-EFP consumes approximately 25 mA (typical) from the 3.3 V supply, dissipating 82 mW in the die. The 48-pin VQFN package has an approximate theta_JA of 41 C/W on a 2-layer PCB (per SAM D51 thermal model), giving a junction temperature rise of only 3.4 C above 25 C ambient - no special thermal management required. For operation above 60 C ambient, a 4-layer PCB with internal ground plane reduces theta_JA to ~22 C/W.
Do not connect the XIN and XOUT pins to an external clock without disabling the crystal oscillator's on-chip feedback. The simplest startup sequence per the datasheet is to first enable the XOSC control register, wait for the XOSC RDY flag, then switch the clock source - otherwise the part can hang in a non-responding state on cold boot. Also ensure RESET is held low at power-up until VDD reaches 1.71 V minimum, otherwise erratic behavior can occur.
The I2S lines (BCLK, LRCK, DATA) should be routed as a length-matched group of three with maximum length 50 mm. Place a small ferrite bead or 33 ohm series resistor on the I2S DATA line near the audio codec to dampen reflections from codec input capacitance. Estimated: a 33 ohm resistor with typical 5 pF trace capacitance gives a 5 ns rise time consistent with 192 kHz audio sampling.
Compliance Information
RoHS compliant per Microchip product page. Not AEC-Q100 qualified - for automotive applications consider ATSAME51-series parts with automotive qualification.
