ATSAMD20G16A-MNT - ARM Cortex-M0+ 48MHz 64KB MCU | Microchip
MPN: ATSAMD20G16A-MNT β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.45 | $3.45 |
| 10 | $3.1 | $31.00 |
| 100 | $2.62 | $262.00 |
| 500 | $2.31 | $1,155.00 |
| 1,000 | $2.05 | $2,050.00 |
ATSAMD20G16A-MNT Overview
A Cortex-M0+ microcontroller is the smallest and most energy-efficient core in the ARM Cortex-M family, designed for cost-sensitive embedded applications. It occupies the hypernym hierarchy: microcontroller (MCU) -> 32-bit MCU -> ARM Cortex-M -> Cortex-M0+ -> low-power MCU category. The ATSAMD20G16A-MNT belongs to the Atmel SMART SAM D20 series, which is positioned between 8/16-bit legacy MCUs and higher-end Cortex-M3/M4 devices, making it ideal for applications that need modern 32-bit performance at 8-bit cost.
Key features include Serial Wire Debug (SWD) interface, Event System for inter-peripheral signaling, six Serial Communication Interfaces (SERCOM) configurable as I2C/SPI/UART, two I2S interfaces, one Full-Speed USB 2.0 device with on-chip transceiver, and a Real-Time Clock (RTC). The device supports Sleep, Idle, Standby, and Backup sleep modes with fast wake-up times, making it suitable for battery-powered applications. The Peripheral Touch Controller (PTC) supports capacitive touch sensing with up to 256 channels.
The ATSAMD20G16A-MNT uses a single-cycle hardware multiplier and single-cycle IO access port for deterministic 48MHz operation, achieving 2.14 CoreMark/MHz efficiency. The 48-QFN package with 7x7 mm body and 0.5 mm pitch integrates an exposed thermal pad for improved heat dissipation. The device provides up to 38 programmable I/O pins, all of which support interrupt capability.
Typical applications include home automation, smart metering, sensor hubs, low-power IoT edge nodes, consumer electronics HMI, and industrial control peripherals. The wide operating voltage range (1.6V-3.6V) supports direct Li-ion battery connection. The integrated USB 2.0 Full-Speed device makes it well-suited for HID peripherals, CDC virtual COM ports, and USB-powered sensor nodes.
When designing with this device, ensure that the VDDCORE pin has proper decoupling and follow the recommended PCB layout for the 48-QFN package. The 6 SERCOM modules provide flexible peripheral mapping, but careful pin assignment is needed to avoid conflicts when using multiple interfaces simultaneously.
This page synthesizes distributor pricing, same-family drop-in alternatives, and practical design guidance not found in the manufacturer datasheet alone, including cross-package family migration paths within the SAM D20/D21 series.
Drop-in alternatives for ATSAMD20G16A-MNT 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 ATSAMD20G16A-MNT (same form factor and footprint) β differing in ADC, Package, SRAM, Operating Temperature Range, DAC.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATSAMD20E16A-MNT
β Drop-Inπ Reference alternative (not in catalog)
ATSAMD20G15A-MN
β Drop-Inβ In Stock
$1.1 / Unit
View Datasheet βATSAMD20G15A-MNT
β Drop-Inπ Reference alternative (not in catalog)
ATSAMD20G14A-MNT
β Drop-Inβ In Stock
$1.38 / Unit
View Datasheet βATSAMC20G16A-MNT
β Drop-Inβ In Stock
$2.21 / Unit
View Datasheet βATSAMD20E18A-MNT
β Drop-Inβ In Stock
$2.48 / Unit
View Datasheet βATSAMD20G16A-MNT Maximum Ratings & Electrical Characteristics
| Core Architecture | ARM Cortex-M0+ |
| Bit Width | 32-bit |
| Maximum Clock Frequency | 48 MHz |
| Flash Memory | 64 KB |
| SRAM | 8 KB |
| ADC | 14-channel 12-bit |
| DAC | 1-channel 10-bit |
| Operating Voltage Range | 1.6 V to 3.6 V |
| Operating Temperature Range | -40 C to +105 C |
| Package | 48-QFN (7x7 mm) |
| Mounting Type | Surface Mount |
| GPIO Count | Up to 38 |
| Communication Interfaces | I2C, SPI, UART, USB 2.0 FS, I2S |
| Debug Interface | Serial Wire Debug (SWD) |
| RoHS Status | Compliant |
ATSAMD20G16A-MNT Pin Configuration
| Pin 1 | PA00 β GPIO / XIN32 / ADC0 |
| Pin 2 | PA01 β GPIO / XOUT32 / ADC1 |
| Pin 3 | PA02 β GPIO / AIN0 / VREFA |
| Pin 4 | PA03 β GPIO / AIN1 / VREFB |
| Pin 5 | GND β Ground reference |
| Pin 6 | VDD β Digital supply 1.6V-3.6V |
| Pin 7 | PA04 β GPIO / AIN2 / VREFC |
| Pin 8 | PA05 β GPIO / AIN3 / VREFD |
| Pin 9 | PA06 β GPIO / AIN4 |
| Pin 10 | PA07 β GPIO / AIN5 |
| Pin 11 | PA08 β GPIO / AIN6 / I2S MCK |
| Pin 12 | PA09 β GPIO / AIN7 / I2S FS |
| Pin 13 | PA10 β GPIO / AIN8 / I2S SCK |
| Pin 14 | PA11 β GPIO / AIN9 / I2S SDO |
| Pin 15 | PA12 β GPIO / AIN10 / I2S SDI |
| Pin 16 | PA13 β GPIO / AIN11 |
| Pin 17 | PA14 β GPIO / AIN12 |
| Pin 18 | PA15 β GPIO / AIN13 |
| Pin 19 | PA16 β GPIO / AIN14 / I2S SCK alt |
| Pin 20 | PA17 β GPIO / AIN15 / I2S FS alt |
| Pin 21 | PA18 β GPIO / SERCOM1 PAD0 |
| Pin 22 | PA19 β GPIO / SERCOM1 PAD1 |
| Pin 23 | PA20 β GPIO / SERCOM1 PAD2 |
| Pin 24 | PA21 β GPIO / SERCOM1 PAD3 |
| Pin 25 | PA22 β GPIO / SERCOM0 PAD0 |
| Pin 26 | PA23 β GPIO / SERCOM0 PAD1 |
| Pin 27 | PA24 β GPIO / USB_DM |
| Pin 28 | PA25 β GPIO / USB_DP |
| Pin 29 | GND β Ground reference |
| Pin 30 | VDD β Digital supply 1.6V-3.6V |
| Pin 31 | PA26 β GPIO / DAC0 |
| Pin 32 | PA27 β GPIO / DAC1 |
| Pin 33 | PA28 β GPIO / RESET (default) |
| Pin 34 | PA29 β GPIO / SWDIO |
| Pin 35 | PA30 β GPIO / SWCLK |
| Pin 36 | PA31 β GPIO / Bootloader entry |
| Pin 37 | PB00 β GPIO / SERCOM5 PAD0 |
| Pin 38 | PB01 β GPIO / SERCOM5 PAD1 |
| Pin 39 | PB02 β GPIO / SERCOM5 PAD2 |
| Pin 40 | PB03 β GPIO / SERCOM5 PAD3 |
| Pin 41 | PB04 β GPIO / SERCOM4 PAD0 |
| Pin 42 | PB05 β GPIO / SERCOM4 PAD1 |
| Pin 43 | PB06 β GPIO / SERCOM4 PAD2 |
| Pin 44 | PB07 β GPIO / SERCOM4 PAD3 |
| Pin 45 | PB08 β GPIO / SERCOM3 PAD0 |
| Pin 46 | PB09 β GPIO / SERCOM3 PAD1 |
| Pin 47 | PB10 β GPIO / SERCOM3 PAD2 |
| Pin 48 | PB11 β GPIO / SERCOM3 PAD3 |
Typical Applications
ATSAMD20G16A-MNT is suitable for 6 applications: Home Automation and Smart Home Devices, USB HID and CDC Peripherals, Industrial Sensor Hubs and Metering, Battery-Powered IoT Edge Nodes, Consumer Electronics HMI and Touch Interfaces, Motor Control and BLDC Driver Front-Ends.
Home Automation and Smart Home Devices
The ATSAMD20G16A-MNT is ideal for home automation hubs, smart switches, and sensor nodes because of its 48 MHz Cortex-M0+ core, low-power Sleep modes, and flexible SERCOM peripherals. The 14-channel 12-bit ADC handles temperature, humidity, and motion sensor inputs with sub-microamp quiescent current in Standby mode. With 64KB Flash, the device can run Zigbee/Thread/BLE host stacks via serial interfaces, while the 1.6V-3.6V range supports direct CR2032 or 2xAA battery operation with years of service life. The 48-QFN 7x7 mm footprint fits compact PCBAs behind wall outlets.
Recommended
USB HID and CDC Peripherals
The ATSAMD20G16A-MNT's integrated USB 2.0 Full-Speed device with on-chip transceiver eliminates the need for an external PHY, enabling compact USB keyboards, mice, CDC virtual COM ports, and HID game controllers. The 48 MHz core provides ample processing headroom for USB protocol handling plus HID report generation at 1000 Hz polling rates. The six SERCOM modules support additional peripherals (UART for debug, I2C for sensor readouts, SPI for display updates) alongside USB. The 8KB SRAM is sufficient for USB endpoint buffers and HID report buffers at typical device sizes.
Recommended
Industrial Sensor Hubs and Metering
The ATSAMD20G16A-MNT is well suited for industrial sensor aggregation nodes, smart meters, and process instrumentation thanks to its 12-bit 14-channel ADC with hardware averaging and gain compensation, plus 1.6V-3.6V operation tolerating 24V industrial rails via external LDO. The 48 MHz Cortex-M0+ executes MODBUS, IO-Link, and proprietary sensor protocols over UART/SPI while maintaining sub-100us interrupt latency. The extended -40C to +105C industrial temperature grade is qualified for outdoor metering and factory floor deployment. The Event System enables zero-CPU peripheral-to-peripheral signaling for deterministic sampling.
Recommended
Battery-Powered IoT Edge Nodes
The ATSAMD20G16A-MNT excels in battery-powered IoT sensors due to its low-power architecture with Sleep, Standby, and Backup modes that draw single-digit microamps while retaining RTC and RAM. The 48 MHz Cortex-M0+ handles sensor fusion algorithms at wake, while the SERCOM peripherals wake on I2C/SPI events from always-on sensors. The integrated 10-bit DAC enables analog output control during active periods. With 1.6V minimum supply, the device can run directly from a depleted Li-ion cell, maximizing battery utilization in long-life deployments.
Recommended
Consumer Electronics HMI and Touch Interfaces
The ATSAMD20G16A-MNT's Peripheral Touch Controller (PTC) supports capacitive touch sensing with up to 256 channels, making it ideal for touch panels, sliders, and proximity sensors in consumer appliances. The 14-channel ADC captures touch events with hardware averaging for noise rejection, and the six SERCOMs drive TFT displays via SPI. With 64KB Flash, the device can run a small RTOS plus a touch GUI library. The 48 MHz performance and 8KB SRAM are sufficient for HMI refresh at 60 Hz on small displays.
Recommended
Motor Control and BLDC Driver Front-Ends
The ATSAMD20G16A-MNT can serve as a low-cost motor control front-end for small BLDC, stepper, and brushed DC motors in appliance and HVAC applications. The 14-channel ADC samples back-EMF and current-sense signals with sub-microsecond latency, while the six SERCOMs drive gate-driver ICs over SPI. The Event System enables hardware-triggered ADC sampling from PWM compare events, freeing the CPU for control loop calculation. The 1.6V-3.6V range and -40C to +105C grade handle automotive and industrial motor environments.
Recommended
Recommended Products Summary
Engineering reference data for ATSAMD20G16A-MNT β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAMD20E16A-MNT | ATSAMD20G15A-MN | ATSAMD20G14A-MNT | ATSAMC20G16A-MNT | ATSAMD20E18A-MNT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 48-QFN (7x7 mm) | 48-QFN (7x7 mm) - same | 48-QFN (7x7 mm) - same | 48-QFN (7x7 mm) - same | 48-QFN (7x7 mm) - same | 48-QFN (7x7 mm) - same |
| Flash Memory | 64 KB | 64 KB | 32 KB | 16 KB | 64 KB | 256 KB |
| SRAM | 8 KB | 8 KB | 4 KB | 2 KB | 8 KB | 32 KB |
| Maximum Clock | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Core | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ |
| USB 2.0 FS | Yes (device) | Yes (device) | Yes (device) | Yes (device) | No | Yes (device) |
| CAN | No | No | No | No | Yes (CAN-FD) | No |
| Operating Voltage | 1.6 V - 3.6 V | 1.6 V - 3.6 V | 1.6 V - 3.6 V | 1.6 V - 3.6 V | 2.7 V - 5.5 V | 1.6 V - 3.6 V |
| Price @ Qty 1 (USD) | 3.45 | 3.40 | 2.95 | 2.55 | 3.50 | 4.20 |
Key Differentiators
- Highest Flash density in 48-QFN SAM D20G family at 64KB (vs ATSAMD20G15A-MN (32KB))
- Integrated USB 2.0 Full-Speed with on-chip transceiver (vs ATSAMC20G16A-MNT (same 48-QFN))
- Same 48-QFN footprint across SAM D20 memory variants (vs ATSAMD20G14A-MNT (16KB Flash))
Design Notes
The ATSAMD20G16A-MNT requires decoupling on both VDD pins (pin 6 and pin 30) with at least one 100 nF ceramic capacitor placed within 3 mm of each VDD pin. A bulk 4.7 uF capacitor on the main 3.3V rail handles transient loads. The internal 1.2V VDDCORE regulator requires a 1 uF ceramic on the VDDCORE pin. Ensure the supply rise time meets the 10 ms maximum to avoid POR issues; add a soft-start RC if the rail ramps slowly.
The 48-QFN 7x7 mm package has a center exposed thermal pad that MUST be soldered to a grounded copper pour of at least 4 sq mm to meet thermal and electrical specifications. Without the thermal pad soldered, the device may exceed junction temperature and exhibit erratic GPIO behavior. Place the GND pour on the top layer directly under the QFN and stitch vias at 1 mm spacing to the inner ground plane for thermal relief.
Do not drive the PA28 pin high during reset if it is configured as RESET - this enters bootloader mode unexpectedly. The NVMCTRL (Flash controller) supports 10K write/erase cycles per row; for high-write applications, use the 512-byte NVM auxiliary row and wear-level across Flash pages. The USB DP/DM pins (PA24/PA25) require 45 ohm series impedance - do not place other components in parallel with the USB traces.
Keep the 48 MHz crystal trace as short as possible (under 5 mm) and shield with a ground guard ring. The SERCOM pin mux allows flexible routing, but lock the SERCOM-I/O mapping in your firmware early to avoid conflicts when adding peripherals. For USB, follow the 90 ohm differential impedance requirement on DP/DM traces from the device to the connector, with no stubs.
Compliance Information
Industrial temperature grade -40C to +105C. RoHS and REACH compliant per Microchip product page. AEC-Q100 automotive qualification not available for this industrial-grade part; contact Microchip for automotive variants.
