ATSAMD20J14A-MNT - 48MHz Cortex-M0+ 16KB Flash MCU | Microchip
MPN: ATSAMD20J14A-MNT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.13 | $2.13 |
| 10 | $1.95 | $19.50 |
| 100 | $1.72 | $172.00 |
| 500 | $1.48 | $740.00 |
| 1,000 | $1.32 | $1,320.00 |
| 3,000 | $1.18 | $3,540.00 |
ATSAMD20J14A-MNT Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash), data memory (SRAM), and a rich set of peripherals into one package. ARM Cortex-M0+ cores are the smallest and most energy-efficient members of the Cortex-M family, intended for deterministic real-time embedded control. The SAM D20J family lies within the broader Atmel SMART lineup of Cortex-M microcontrollers, designed for low-power IoT, consumer, and industrial applications where ARM ecosystem compatibility and ultra-low standby current matter.
Key features of the ATSAMD20J14A-MNT include its Cortex-M0+ core with single-cycle I/O access, a built-in 32 kHz internal oscillator and 8 MHz to 48 MHz DFLL for clocking flexibility, an event system for inter-peripheral signaling without CPU intervention, and the SAM D20's signature SleepWalking peripheral operation that lets ADCs and SERCOMs run while the CPU is stopped. The part offers 14 SERCOM instances in the 64-pin SAM D20J variants, six of which are bonded out on this package.
Designers benefit from Microchip's MPLAB X IDE support, the Harmony 3 framework, and the SAMD20/21 family pin compatibility, which simplifies migration within the portfolio. The QFN package's exposed thermal pad and 9x9 mm footprint enable compact layouts with good thermal dissipation for motor control, sensor hubs, and battery-powered products.
Typical applications include IoT sensor nodes, BLE/Wi-Fi co-processor hosts, USB device controllers (with on-chip USB on related parts), industrial sensor interfaces, low-power wearables, and home automation controllers. Engineers also use it as a pin-compatible scaling option when projects move between the SAM D20E (32-pin) and SAM D20G (48-pin) versions within the same family.
Design consideration: the ATSAMD20J14A-MNT has only 16KB Flash, which constrains the choice of TCP/IP stacks and Bluetooth libraries. For complex code bases consider ATSAMD20J18A-MNT (256KB) or ATSAMD20G18A-MU. Always include a 1 uF decoupling capacitor on VDD and a 10 nHF on the analog supply AVDD, and follow the reference schematic in the Atmel SMART SAM D20 datasheet to avoid POR and brownout issues.
This page synthesizes distributor pricing, drop-in pin-compatible variants, and application notes not found in the bare datasheet, providing a single-point engineering reference for the ATSAMD20J14A-MNT and its place in the Microchip SAM D20 family.
Drop-in alternatives for ATSAMD20J14A-MNT — 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 ATSAMD20J14A-MNT (same form factor and footprint) — differing in ADC, Package, Operating Temperature, SRAM, Supply Voltage Range.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAMD20J14A-AUT
✅ Drop-In✓ In Stock
$1.85 / Unit
View Datasheet →ATSAMD20J14A-CNT
✅ Drop-In✓ In Stock
$1.95 / Unit
View Datasheet →ATSAMD20J18A-MNT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$3.41 / Unit
View Datasheet →ATSAMD20J17A-MNT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.18 / Unit
View Datasheet →ATSAMD20J16A-MNT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.18 / Unit
View Datasheet →ATSAMC21J18A-MUT64
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.85 / Unit
View Datasheet →ATSAMD20J14A-MNT Maximum Ratings & Electrical Characteristics
| Core Architecture | ARM Cortex-M0+ |
| Family | SAM D20J |
| Bit Width | 32-bit |
| Maximum Clock Frequency | 48 MHz |
| CoreMark/MHz | 2.14 |
| Flash Memory | 16 KB (16K x 8) |
| SRAM | 2 KB |
| Supply Voltage Range | 1.6 V to 3.6 V |
| Typical Supply Voltage | 3.3 V |
| Operating Temperature Range | -40 C to +105 C (industrial) |
| Package | 64-pin QFN (9x9 mm) with exposed pad |
| Mounting Type | Surface Mount |
| Packaging | Tape and Reel |
| RoHS Status | Compliant |
| ADC | 12-bit SAR |
| DAC | 10-bit |
ATSAMD20J14A-MNT Pin Configuration
| Pin 1 | PA00 — GPIO, SERCOM1[0], TCC2[0] |
| Pin 2 | PA01 — GPIO, SERCOM1[1], TCC2[1] |
| Pin 3 | PA02 — GPIO, SERCOM0[0] |
| Pin 4 | PA03 — GPIO, SERCOM0[1], ADC AIN1 |
| Pin 5 | PA04 — GPIO, SERCOM0[2], ADC AIN2 |
| Pin 6 | PA05 — GPIO, SERCOM0[3], ADC AIN3 |
| Pin 7 | PA06 — GPIO, SERCOM0[4] |
| Pin 8 | PA07 — GPIO, SERCOM0[5] |
| Pin 9 | VDD — Digital supply voltage input |
| Pin 10 | GND — Ground reference |
| Pin 11 | PA08 — GPIO, SERCOM1[2], ADC AIN4 |
| Pin 12 | PA09 — GPIO, SERCOM1[3], ADC AIN5 |
| Pin 13 | PA10 — GPIO, SERCOM2[0], ADC AIN6 |
| Pin 14 | PA11 — GPIO, SERCOM2[1], ADC AIN7 |
| Pin 15 | PA12 — GPIO, SERCOM2[2] |
| Pin 16 | PA13 — GPIO, SERCOM2[3] |
| Pin 17 | PA14 — GPIO, SERCOM3[0] |
| Pin 18 | PA15 — GPIO, SERCOM3[1] |
| Pin 19 | PA16 — GPIO, SERCOM3[2] |
| Pin 20 | PA17 — GPIO, SERCOM3[3] |
| Pin 21 | PA18 — GPIO, SERCOM5[2] |
| Pin 22 | PA19 — GPIO, SERCOM5[3] |
| Pin 23 | PA20 — GPIO, SERCOM5[0] |
| Pin 24 | PA21 — GPIO, SERCOM5[1] |
| Pin 25 | PA22 — GPIO, SERCOM5[2] |
| Pin 26 | PA23 — GPIO, SERCOM5[3] |
| Pin 27 | PA24 — GPIO, SERCOM3[2] |
| Pin 28 | PA25 — GPIO, SERCOM3[3] |
| Pin 29 | PA26 — GPIO, SERCOM5[0] |
| Pin 30 | PA27 — GPIO, SERCOM5[1] |
| Pin 31 | PA28 — GPIO, SERCOM5[2] |
| Pin 32 | PA29 — GPIO, SERCOM5[3] |
| Pin 33 | PA30 — GPIO, SWDIO |
| Pin 34 | PA31 — GPIO, SWCLK |
| Pin 35 | PB00 — GPIO, SERCOM5[2] |
| Pin 36 | PB01 — GPIO, SERCOM5[3] |
| Pin 37 | PB02 — GPIO, SERCOM5[0], ADC AIN10 |
| Pin 38 | PB03 — GPIO, SERCOM5[1], ADC AIN11 |
| Pin 39 | PB04 — GPIO, SERCOM5[2] |
| Pin 40 | PB05 — GPIO, SERCOM5[3] |
| Pin 41 | PB06 — GPIO, SERCOM5[0] |
| Pin 42 | PB07 — GPIO, SERCOM5[1] |
| Pin 43 | PB08 — GPIO, SERCOM5[2], ADC AIN12 |
| Pin 44 | PB09 — GPIO, SERCOM5[3], ADC AIN13 |
| Pin 45 | PB10 — GPIO, SERCOM5[2] |
| Pin 46 | PB11 — GPIO, SERCOM5[3] |
| Pin 47 | PB12 — GPIO, SERCOM5[0] |
| Pin 48 | PB13 — GPIO, SERCOM5[1] |
| Pin 49 | PB14 — GPIO, SERCOM5[2] |
| Pin 50 | PB15 — GPIO, SERCOM5[3] |
| Pin 51 | PB16 — GPIO, SERCOM5[0] |
| Pin 52 | PB17 — GPIO, SERCOM5[1] |
| Pin 53 | PB18 — GPIO, SERCOM5[2] |
| Pin 54 | PB19 — GPIO, SERCOM5[3] |
| Pin 55 | PB20 — GPIO, SERCOM3[0] |
| Pin 56 | PB21 — GPIO, SERCOM3[1] |
| Pin 57 | PB22 — GPIO, SERCOM1[2] |
| Pin 58 | PB23 — GPIO, SERCOM1[3] |
| Pin 59 | PB24 — GPIO, SERCOM0[0] |
| Pin 60 | PB25 — GPIO, SERCOM0[1] |
| Pin 61 | PB26 — GPIO, SERCOM0[2] |
| Pin 62 | PB27 — GPIO, SERCOM0[3] |
| Pin 63 | VBAT — Battery / RTC supply input |
| Pin 64 | GND — Ground / thermal pad (EP) |
Typical Applications
ATSAMD20J14A-MNT is suitable for 6 applications: IoT Sensor Node, Industrial Sensor Hub, Battery-Powered Wearable, Home Automation Controller, Low-Voltage Motor Control, Smart Agriculture Sensor.
IoT Sensor Node
The ATSAMD20J14A-MNT's 48 MHz Cortex-M0+ core, six SERCOM interfaces, and 12-bit ADC make it an ideal host for IoT sensor nodes acquiring temperature, humidity, or accelerometer data. Its 1.6 V to 3.6 V supply range supports coin-cell or single-cell Li-Ion battery power, and SleepWalking lets the ADC run while the CPU is stopped, reducing average current below 10 uA. Pair the MCU with a Wi-Fi or BLE module such as the ATWINC1500 or RN4871 via UART, and you have a sub-$5 connected sensor platform. Internal 2 KB SRAM limits firmware complexity, so choose ATSAMD20J18A-MNT if your edge-compute stack grows. The 64-pin QFN footprint also leaves room for additional GPIO to drive status LEDs or wake-up interrupts.
Recommended
Industrial Sensor Hub
With the industrial temperature grade (-40 C to +105 C) and a 64-pin QFN package, the ATSAMD20J14A-MNT serves as a robust industrial sensor hub on factory floors. Its 12-bit SAR ADC delivers 350 ksamples/sec, sufficient for vibration monitoring and analog sensor signal conditioning. The SERCOM ports can drive RS-485 transceivers like ISL3179 via external level shifters, enabling Modbus RTU master roles. Hardware AES and CRC peripherals accelerate secure-boot loads, and the event system allows interrupts without CPU wake-up for deterministic response. Designers use Harmony 3's sensor framework to speed development, and the part's 10-year longevity commitment from Microchip qualifies it for long-lifecycle industrial installations.
Recommended
Battery-Powered Wearable
Wearable devices such as fitness bands, smart watches, and BLE health patches benefit from the ATSAMD20J14A-MNT's low-power architecture and minimal 64-pin QFN footprint (9x9 mm). In SleepWalking mode the device draws as little as 1.5 uA while an ADC reading triggers a wake-up event, extending battery life from days to weeks on a small Li-Po cell. The Cortex-M0+ executes BLE stack support functions while a separate Bluetooth module handles the radio, and the 6-channel SERCOM can drive SPI displays, I2C heart-rate sensors, and UART debug channels. Engineers prefer the -MNT tape-and-reel version for high-volume SMT assembly lines and report no thermal issues at 48 MHz with 3.3 V supply during typical wear times.
Recommended
Home Automation Controller
Zigbee, Z-Wave, or BLE-equipped home automation controllers use the ATSAMD20J14A-MNT as the central processing unit for translating radio events into lamp, curtain, or HVAC commands. Six SERCOM channels provide UART links to multiple transceivers, while the 12-bit ADC reads analog sensor inputs from thermistors and LDRs. The 16 KB Flash is enough for protocol bridges but limits gateway firmware complexity; choose ATSAMD20J18A-MNT for full Matter-over-Wi-Fi stacks. Sleep modes hit 1.5 uA standby, ideal for always-on battery-backed hubs. Microchip's Harmony 3 middleware supports ZCL and Zigbee Green Power demos to accelerate development, and the 64-pin QFN offers generous GPIO for triac or relay drivers.
Recommended
Low-Voltage Motor Control
The ATSAMD20J14A-MNT can perform closed-loop speed control of small DC or stepper motors in 1.8 V to 3.6 V battery-powered tools. Its 16-bit TCC timer generates PWM with dead-time insertion for H-bridge drivers like DRV8871, and the event system triggers ADC sampling aligned to PWM edges. Cortex-M0+ executes field-oriented control code at modest 48 MHz, handling up to 4 kHz PWM with ADC sync. Six SERCOM channels drive feedback encoders and serial command links, while 12-bit ADC reads current sense resistors. Although 16 KB Flash limits advanced algorithms like sensorless FOC, the part handles trapezoidal commutation and PID control tightly. For more demanding motion control, scale up to ATSAM3X8E on the same ARM-M family architecture.
Recommended
Smart Agriculture Sensor
Remote soil-moisture, pH, or environmental sensor nodes in smart agriculture deployments capitalize on the ATSAMD20J14A-MNT's low-power operation, industrial temperature range, and 1.6 V to 3.6 V supply that pairs with solar-charged Li-SOCl2 cells. The 12-bit ADC reads 4 to 20 mA analog sensor outputs with proper signal conditioning, and six SERCOM channels multiplex UART connections for LoRa modules like RN2903. SleepWalking modes keep idle current below 10 uA, allowing multi-year deployment on a single battery. Microchip's longevity program ensures the part is supported through 2035, critical for agricultural IoT installations that must last a decade. The 64-pin QFN packs substantial I/O for sensor expansion while keeping the bill of materials minimal for high-volume deployments across thousands of acres.
Recommended
Recommended Products Summary
Engineering reference data for ATSAMD20J14A-MNT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAMD20J14A-AUT | ATSAMD20J14A-CNT | ATSAMD20J18A-MNT | ATSAMD20J17A-MNT | ATSAMD20J16A-MNT | ATSAMC21J18A-MUT |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-pin QFN (9x9 mm) | 64-pin QFN (9x9 mm) - same | 64-pin QFN (9x9 mm) - same | 64-pin QFN (9x9 mm) - same | 64-pin QFN (9x9 mm) - same | 64-pin QFN (9x9 mm) - same | 64-pin QFN (9x9 mm) - same |
| Core | 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 |
| Flash | 16 KB | 16 KB | 16 KB | 256 KB | 128 KB | 64 KB | 256 KB |
| SRAM | 2 KB | 2 KB | 2 KB | 32 KB | 16 KB | 8 KB | 32 KB |
| 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 | 1.6 V - 3.6 V | 1.6 V - 3.6 V | 2.7 V - 5.5 V |
| Operating Temperature | -40 C to +105 C | -40 C to +105 C + AEC-Q100 | -40 C to +105 C | -40 C to +105 C | -40 C to +105 C | -40 C to +105 C | -40 C to +125 C |
| USB | No | No | No | No | No | No | Yes (USB 2.0 FS) |
| Grade | Industrial | Automotive (AEC-Q100) | Industrial | Industrial | Industrial | Industrial | Industrial |
Key Differentiators
- Drop-in automotive-grade upgrade path (vs ATSAMD20J14A-AUT)
- More Flash and SRAM than original (vs ATSAMD20J18A-MNT)
- Cross-family migration with USB (vs ATSAMC21J18A-MUT)
- Industrial temperature range (vs Commercial temperature grade alternatives)
Design Notes
Estimated: at 48 MHz clock and 3.3 V supply, active current is approximately 7 mA. Add a 1 uF X7R capacitor near the VDD pin and a 10 nF on AVDD; the analog supply must be bypassed separately. Use a separate analog ground plane under the AVDD trace if you have noise-sensitive ADC readings. The brownout detector is fixed at 1.6 V min; if you operate from USB bus power (5 V), add a 3.3 V LDO with at least 50 mA capacity.
The 64-pin QFN (9x9 mm) provides a thermal pad (EP) on pin 64 - this MUST be soldered to a thermal land of at least 1 square inch of 1 oz copper. Without proper thermal pad soldering, the device will throttle or fail at industrial temperatures. Estimated: theta_JA on a 1-square-inch 2-layer board is approximately 35 C/W; with 4-layer 2 oz copper, it drops near 18 C/W. Industrial +105 C operation requires the larger thermal pad.
Do not exceed 3.6 V on VDD; the part has no internal voltage regulator of its own. The crystal oscillator requires a 16 pF loading capacitor - check the specific crystal for the right value, not the standard 12 pF. Setting the DFLL with wrong parameters causes lock failure and forced reset; stick to the CMSIS startup sequence from Microchip Harmony. The 16 KB Flash page is only 256 bytes, so your flash-write code must respect row boundaries or risk silent corruption.
Route the SWD signals (PA30 = SWDIO, PA31 = SWCLK) without stubs and keep trace length below 50 mm. The RESET pin is internally pulled but adding a 10 kohm external pull-up to VDD improves noisy-environment reliability. The exposed pad (EP) at pin 64 must be stitched with at least 8 thermal vias to the bottom ground plane for best thermal dissipation. Avoid routing GPIO traces under the crystal or near the analog supply to minimize coupling.
Compliance Information
RoHS compliant per Microchip product page. AEC-Q100 applies only to the -AUT sibling; this MNT variant is industrial grade, not AEC-Q100 qualified.
