ATSAMD20G14A-MNT - ARM Cortex-M0+ MCU, 48MHz, 16KB Flash | Microchip
MPN: ATSAMD20G14A-MNT β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.1 | $2.10 |
| 10 | $1.95 | $19.50 |
| 100 | $1.72 | $172.00 |
| 500 | $1.55 | $775.00 |
| 1,000 | $1.38 | $1,380.00 |
ATSAMD20G14A-MNT Overview
A microcontroller (MCU) is a single-chip computer that combines a CPU core, program and data memory, and a rich set of on-chip peripherals such as timers, ADC, communication interfaces, and general-purpose I/O. The ARM Cortex-M0+ belongs to the Cortex-M family of 32-bit RISC cores designed for embedded systems, while Microchip's SAM D20 product line extends this core with low-power SleepWalking peripherals, a SERCOM (Serial Communication Interface) block, and event system that make the device competitive against 8-bit and 16-bit MCUs while remaining easy to program. Within the broader taxonomy, this part sits at: MCU -> microcontroller -> ARM Cortex-M0+ microcontroller -> SAM D20 family -> low-power Cortex-M0+ MCU.
Key features of the ATSAMD20G14A-MNT include up to 38 GPIO pins, six SERCOM channels configurable as UART/SPI/I2C, a 12-bit 350 ksps ADC with up to 14 channels, 16-bit timers/counters, a 32 kHz RTC, full-speed USB 2.0 device support in related variants, and the standard SAM D20 peripheral mix. The 'MNT' suffix indicates the industrial temperature grade (-40C to +105C), VQFN-48 (7x7) package, and Tape & Reel packaging, with Pb-free / RoHS-compliant lead finish.
Typical applications include home automation, consumer electronics, smart metering, industrial sensor nodes, human-machine interface (HMI) controllers, and IoT edge devices. Compared with 8-bit PIC or AVR alternatives at similar cost points, the SAM D20G delivers roughly an order-of-magnitude more compute, modern peripherals, and an ARM ecosystem (CMSIS, ASF, Harmony, GCC/IAR/Keil toolchains). At the same time it preserves strong low-power behaviour - down to a few microamperes in deep-sleep modes with RAM retention - making it a credible drop-in upgrade when firmware complexity outgrows 8-bit MCUs.
When designing with the ATSAMD20G14A-MNT, ensure the 48-pin VQFN exposed pad is soldered to a continuous ground plane for both thermal and electrical performance, place the two 100 nF + 1 uF VDD decoupling pairs within 2 mm of each VDD pin, and follow Microchip's SAM D20 reference design notes for the 32.768 kHz crystal layout if RTC accuracy is required.
Drop-in alternatives for ATSAMD20G14A-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 ATSAMD20G14A-MNT (same form factor and footprint) β differing in Package, ADC, DAC, SRAM, Operating Temperature.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATSAMD20G14A-MN
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$1.89 / Unit
View Datasheet βATSAMD20G14A-AN
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$2.03 / Unit
View Datasheet βATSAMD20E18A-MNT
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$2.48 / Unit
View Datasheet βATSAMD20E16B-MN
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$1.62 / Unit
View Datasheet βATSAMD11D14A-MNT
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$1.2 / Unit
View Datasheet βATSAMD10D14A-MNT
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$1.42 / Unit
View Datasheet βATSAMD20G14A-MNT Maximum Ratings & Electrical Characteristics
| Core Architecture | ARM Cortex-M0+ (32-bit) |
| Family | Atmel | SMART SAM D20G |
| Maximum CPU Frequency | 48 MHz |
| CoreMark / MHz | 2.14 |
| Program Flash Memory | 16 KB (16K x 8) |
| SRAM | 2 KB |
| Supply Voltage (VDD) | 1.62 V to 3.63 V |
| Operating Temperature | -40 C to +105 C (industrial grade) |
| GPIO Count | Up to 38 |
| SERCOM Channels | 6 (configurable as UART / SPI / I2C) |
| ADC | 12-bit, up to 350 ksps |
| Timer / Counter | 16-bit, multiple channels |
| Package | 48-pin VQFN (7x7 mm) with exposed pad |
| Mounting Type | Surface Mount |
| RoHS Status | Pb-free / RoHS-compliant (Green) |
ATSAMD20G14A-MNT Pin Configuration
| Pin 1 | PA00 β GPIO / XIN32 (32.768 kHz crystal input) |
| Pin 2 | PA01 β GPIO / XOUT32 (32.768 kHz crystal output) |
| Pin 3 | PA02 β GPIO / AIN0 (ADC input) |
| Pin 4 | PA03 β GPIO / AIN1 (ADC input) |
| Pin 5 | GND β Ground |
| Pin 6 | VDD β Digital supply voltage |
| Pin 7 | PA04 β GPIO / AIN2 / VREFA |
| Pin 8 | PA05 β GPIO / AIN3 |
| Pin 9 | PA06 β GPIO / AIN4 |
| Pin 10 | PA07 β GPIO / AIN5 |
| Pin 11 | PA08 β GPIO / NMI |
| Pin 12 | PA09 β GPIO / SERCOM alt |
| Pin 13 | PA10 β GPIO / SERCOM alt |
| Pin 14 | PA11 β GPIO / SERCOM alt |
| Pin 15 | VDDCORE β Internal core voltage (decoupling) |
| Pin 16 | GND β Ground |
| Pin 17 | PA12 β GPIO / SERCOM alt |
| Pin 18 | PA13 β GPIO / SERCOM alt |
| Pin 19 | PA14 β GPIO / SERCOM alt |
| Pin 20 | PA15 β GPIO / SERCOM alt |
| Pin 21 | PA16 β GPIO / SERCOM alt |
| Pin 22 | PA17 β GPIO / SERCOM alt |
| Pin 23 | PA18 β GPIO / SERCOM alt |
| Pin 24 | PA19 β GPIO / SERCOM alt |
| Pin 25 | PA20 β GPIO / SERCOM alt |
| Pin 26 | PA21 β GPIO / SERCOM alt |
| Pin 27 | PA22 β GPIO / SERCOM alt |
| Pin 28 | PA23 β GPIO / SERCOM alt |
| Pin 29 | PA24 β GPIO / USB_DM (if USB present on related variant) |
| Pin 30 | PA25 β GPIO / USB_DP (if USB present on related variant) |
| Pin 31 | GND β Ground |
| Pin 32 | VDD β Digital supply voltage |
| Pin 33 | PA26 β GPIO |
| Pin 34 | PA27 β GPIO |
| Pin 35 | PA28 β GPIO / Reset pin alt |
| Pin 36 | PA29 β GPIO |
| Pin 37 | PA30 β GPIO / SWCLK (debug) |
| Pin 38 | PA31 β GPIO / SWDIO (debug) |
| Pin 39 | PB00 β GPIO |
| Pin 40 | PB01 β GPIO |
| Pin 41 | PB02 β GPIO / SERCOM alt |
| Pin 42 | PB03 β GPIO / SERCOM alt |
| Pin 43 | PB04 β GPIO / SERCOM alt |
| Pin 44 | PB05 β GPIO / SERCOM alt |
| Pin 45 | PB06 β GPIO / SERCOM alt |
| Pin 46 | PB07 β GPIO / SERCOM alt |
| Pin 47 | PB08 β GPIO / SERCOM alt |
| Pin 48 | PB09 β GPIO / SERCOM alt |
Typical Applications
ATSAMD20G14A-MNT is suitable for 6 applications: Home Automation / Smart Home Nodes, Smart Metering Endpoints, Industrial Sensor Hubs, Consumer Electronics Human-Machine Interface (HMI), Wearable Fitness Bands, Battery-Powered IoT Edge Nodes.
Home Automation / Smart Home Nodes
The ATSAMD20G14A-MNT fits home-automation sensor and actuator nodes because its 32-bit Cortex-M0+ at 48 MHz executes Zigbee, BLE-Mesh (via external radio), or Matter protocol stacks in firmware, while the 6 SERCOM channels give UART/SPI/I2C flexibility for sensors, keypads, and triac drivers. Deep-sleep currents in the microampere range with RAM retention enable multi-year battery life on coin cells for door/window sensors, and the 12-bit ADC reads thermistor or LDR signals directly. Place the part between the 3V coin cell and the load switches; use the event system to wake the CPU only on GPIO change.
Recommended
Smart Metering Endpoints
The ATSAMD20G14A-MNT is well matched to smart electricity, water, and gas metering endpoints where the 12-bit 350 ksps ADC samples load current/voltage, the 16-bit timer captures pulse counting, and SERCOM interfaces to a wireless M-Bus or LoRaWAN modem. Its 1.62V-3.63V supply range lets it run directly from a 3.6V lithium primary cell, and the industrial -40C to +105C grade supports outdoor meter enclosures. Use the on-chip RTC with external 32.768 kHz crystal for time-stamping tariff events; the Cortex-M0+ delivers enough compute for IEC 62056-21 DLMS/COSEM encoding in firmware.
Recommended
Industrial Sensor Hubs
Industrial 4-20 mA loop-powered sensor hubs benefit from the ATSAMD20G14A-MNT's wide 1.62V-3.63V supply tolerance, six SERCOM channels for Modbus RTU or RS-485 multi-drop, and the event system that lets ADC, SERCOM, and timers wake the CPU only when needed. The industrial temperature grade (-40C to +105C) handles factory-floor thermal stress, and the 38 GPIOs accommodate button, LED, and HMI LCD interfaces. Position between the 24V loop-derived 3.3V rail and the RS-485 transceiver; the MCU's small 7x7 mm QFN footprint leaves room for isolation barriers and TVS protection.
Recommended
Consumer Electronics Human-Machine Interface (HMI)
The ATSAMD20G14A-MNT powers low-cost consumer HMI panels (small appliances, e-bike displays, smart thermostats) because it drives character or small graphic OLEDs over SPI, reads capacitive touch via the PTC peripheral, and animates UI smoothly at 48 MHz on a Cortex-M0+ core. With 16 KB flash and 2 KB SRAM, it fits structured menu systems, simple icon bitmaps, and wireless pairing stacks over BLE. Use it as the main MCU between the 3.3V LDO and the OLED/touch daughter board; the 6 SERCOM ports handle SPI display, I2C touch, and UART debug simultaneously.
Recommended
Wearable Fitness Bands
Wearables such as fitness bands and BLE heart-rate straps can leverage the ATSAMD20G14A-MNT for sensor aggregation (accelerometer, optical heart rate, skin temperature) at low power, with the SERCOM SPI interfacing the sensor stack and I2C connecting to a BLE SoC like the ATBTLC1000. Deep-sleep with full RAM retention keeps idle current in the microampere range, and the small 7x7 mm VQFN footprint is suitable for compact wristband PCBs. Drive LEDs and a vibration motor via PWM channels, and use the event system to wake on accelerometer interrupts without CPU intervention.
Recommended
Battery-Powered IoT Edge Nodes
Battery-powered IoT edge nodes benefit from the ATSAMD20G14A-MNT's combination of SleepWalking peripherals (ADC and SERCOM can monitor inputs while CPU sleeps), 1.62V-3.63V single-supply operation, and Cortex-M0+ compute headroom for over-the-air (OTA) update handlers. The device consumes only a few microamperes in deep-sleep with RAM retention, allowing multi-year operation on 2x AA cells when duty-cycled. Position the MCU as the central processor between the battery, sensor I2C/SPI bus, and a sub-GHz or BLE radio companion.
Recommended
Recommended Products Summary
Engineering reference data for ATSAMD20G14A-MNT β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAMD20G14A-MN | ATSAMD20G14A-AN | ATSAMD20E18A-MNT | ATSAMD20E16B-MN | ATSAMD11D14A-MNT | ATSAMD10D14A-MNT |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 48-VQFN (7x7) | 48-VQFN (7x7) - same | 48-VQFN (7x7) - same | 48-VQFN (7x7) - same | 48-VQFN (7x7) - same | 48-VQFN (7x7) - same | 48-VQFN (7x7) - same |
| Flash | 16 KB | 16 KB | 16 KB | 32 KB (+100%) | 16 KB | 16 KB | 16 KB |
| SRAM | 2 KB | 2 KB | 2 KB | 4 KB (+100%) | 2 KB | 4 KB (+100%) | 4 KB (+100%) |
| Core | ARM Cortex-M0+ 48 MHz | Cortex-M0+ 48 MHz | Cortex-M0+ 48 MHz | Cortex-M0+ 48 MHz | Cortex-M0+ 48 MHz | Cortex-M0+ 48 MHz | Cortex-M0+ 48 MHz |
| SERCOM Channels | 6 | 6 | 6 | 6 | 6 | 5 (-17%) | 5 (-17%) |
| Supply Voltage | 1.62V to 3.63V | 1.62V to 3.63V | 1.62V to 3.63V | 1.62V to 3.63V | 1.62V to 3.63V | 1.62V to 3.63V | 1.62V to 3.63V |
| Operating Temperature | -40C to +105C (industrial) | -40C to +105C | -40C to +125C (extended) | -40C to +105C | -40C to +105C | -40C to +85C | -40C to +85C |
| USB Device Support | Not in this pin count (D20 48-pin) | No | No | No | No | Yes (native USB 2.0 FS device) | No |
Key Differentiators
- Lowest-cost SAM D20 entry point with industrial temperature grade (vs ATSAMD20G14A-MN)
- Double the flash and SRAM without changing footprint (vs ATSAMD20E18A-MNT)
- Family upgrade path with USB and more SRAM (vs ATSAMD11D14A-MNT)
Design Notes
Solder the 48-VQFN exposed pad to a continuous ground plane using an array of thermal vias (typically 0.3 mm drill, 0.6 mm pitch, 9-16 vias) for both electrical reference and thermal dissipation. According to the SAM D20 hardware design considerations, missing or insufficient ground stitching on the EP will degrade ADC accuracy and increase die junction temperature. Place at least one 100 nF + 1 uF ceramic decoupling pair within 2 mm of each VDD/VDDCORE pin pair.
The ATSAMD20G14A-MNT's flash is only 16 KB - firmware using Microchip's Harmony 3 framework easily exceeds this budget. Before committing to this part, compile a representative firmware set (USB CDC + FreeRTOS + drivers) and check linker MAP output. If you approach the 14 KB wall, migrate to ATSAMD20E18A-MNT (32 KB) which is pin-compatible. Also note: the PA28 pin is shared with RESET in some configurations - verify you have not assigned it as GPIO if you need hardware reset.
If you wire the SWD debug interface (PA30/PA31) directly to a Cortex-M debug header, add 100 kohm pull-up on SWDIO and 100 kohm pull-down on SWCLK per the SAM D20 datasheet, and a 10 nF series capacitor on SWDIO for hot-plug protection. Keep SWD traces under 50 mm and away from switching power lines. Use Segger J-Link or Atmel-ICE for production programming; both are officially supported for the ATSAMD20G14A per SEGGER's supported devices list.
Compliance Information
Pb-free / Green finish per Microchip ordering code suffix 'NT'. Not AEC-Q100 qualified - not intended for automotive safety-critical use. Halogen-free status: not explicitly stated in scraped product data.
