ATSAMD21E17L-MFT - 128KB Flash 48MHz Cortex-M0+ MCU | Microchip
MPN: ATSAMD21E17L-MFT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.18 | $4.18 |
| 10 | $3.76 | $37.60 |
| 100 | $3.12 | $312.00 |
| 500 | $2.68 | $1,340.00 |
| 1,000 | $2.34 | $2,340.00 |
| 3,000 | $2.05 | $6,150.00 |
ATSAMD21E17L-MFT Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program and data memory, and a rich set of peripherals on one die. ARM Cortex-M0+ cores are the smallest and most energy-efficient members of the Cortex-M family and target deterministic real-time embedded control. The ATSAMD21E17L-MFT sits inside the Cortex-M0+ -> ARM Cortex-M -> 32-bit MCU -> microcontrollers hierarchy, occupying a power-management-optimized tier favored by battery and always-on designs.
Key features include 128 KB flash with 4 KB read-while-write partition, 16 KB SRAM, USB 2.0 full-speed device, SERCOM x6, 12-bit ADC up to 350 ksps, 10-bit DAC, 2 analog comparators, RTC, and PTC (peripheral touch controller). Six flexible SERCOM modules each reconfigure as I2C/SPI/UART, eliminating fixed peripheral pinouts. Hardware crypto is absent on this device family.
The architecture uses a single-cycle 32-bit bus matrix with a low-power bus bridge, a 48 MHz internal DFLL, and a 32.768 kHz RTC oscillator. Event system and SleepWalking peripherals let the CPU stay asleep while DMA routes data, giving the device its characteristic low-power idle numbers that suit battery and energy-harvesting designs.
Typical applications include USB HID peripherals, consumer wearables, home automation, smart metering, IoT sensor hubs, and automotive lighting subsystems. The AEC-Q100 qualification and -40C to +125C extended temperature range (the L suffix) suit automotive interior lighting and industrial-grade enclosures.
When designing with this part, budget decoupling for the AVDD and VDD pins separately per the datasheet, and route the USB D+/D- pair as a 90-ohm differential with a ground keep-out. Use Atmel Studio / MPLAB X with the DFP and the SAME70 Xplained board as a development reference. This page synthesizes distributor pricing, drop-in cross-references, and practical design notes not collected in the manufacturer datasheet.
Drop-in alternatives for ATSAMD21E17L-MFT — 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 ATSAMD21E17L-MFT (same form factor and footprint) — differing in Package, ADC, Operating Temperature Range, DAC, USB.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAMD21E17L-AFT
✅ Drop-In✓ In Stock
$2.7 / Unit
View Datasheet →ATSAMD21E17A-MFT
✅ Drop-In✓ In Stock
$2.55 / Unit
View Datasheet →ATSAMD21E17A-MF
✅ Drop-In✓ In Stock
$3.49 / Unit
View Datasheet →ATSAMD21E17A-AU
✅ Drop-In✓ In Stock
$2.3 / Unit
View Datasheet →ATSAMD21E17A-AF
✅ Drop-In✓ In Stock
$2.34 / Unit
View Datasheet →ATSAMD21E16B-MU
✅ Drop-In✓ In Stock
$2.65 / Unit
View Datasheet →ATSAMD21E17L-MFT Maximum Ratings & Electrical Characteristics
| Product Family | SAM D21E (Cortex-M0+) |
| Core | ARM Cortex-M0+ (32-bit, single-core) |
| Maximum Clock Speed | 48 MHz |
| Program Memory (Flash) | 128 KB (128K x 8) |
| SRAM | 16 KB |
| Operating Voltage Range | 1.62 V to 3.63 V |
| I/O Voltage | 3.3 V typical |
| Package | 32-VQFN (5x5 mm) with exposed pad |
| Pin Count | 32 |
| Operating Temperature Range | -40 C to +125 C (extended, L suffix) |
| USB | USB 2.0 Full-Speed Device with internal transceiver |
| SERCOM Modules | 6 (each reconfigurable as I2C/SPI/UART) |
| ADC | 12-bit, up to 350 ksps |
| DAC | 10-bit, 1 channel |
| Analog Comparators | 2 |
| Touch Peripheral (PTC) | Yes (mutual Vcc) |
| RTC | Yes, with 32.768 kHz oscillator |
| AEC-Q100 Qualification | Yes |
| Functional Safety (FuSa) | Yes |
| Mounting Type | Surface Mount |
| MSL Level | 3 (168 hours) |
| RoHS Status | Compliant |
ATSAMD21E17L-MFT Pin Configuration
| Pin 1 | PA00 — GPIO / XIN32 (RTC crystal in) |
| Pin 2 | PA01 — GPIO / XOUT32 (RTC crystal out) |
| Pin 3 | PA02 — GPIO / AIN0 (ADC input) |
| Pin 4 | PA03 — GPIO / AIN1 / VREFA (ADC reference) |
| Pin 5 | PA04 — GPIO / AIN2 / VREFB (ADC reference) |
| Pin 6 | PA05 — GPIO / AIN3 |
| Pin 7 | PA06 — GPIO / AIN4 |
| Pin 8 | PA07 — GPIO / AIN5 |
| Pin 9 | VDDIO — Digital I/O supply (1.62V to 3.63V) |
| Pin 10 | GND — Ground |
| Pin 11 | PA08 — GPIO / AIN6 / SERCOM0 PAD0 |
| Pin 12 | PA09 — GPIO / AIN7 / SERCOM0 PAD1 |
| Pin 13 | PA10 — GPIO / AIN8 / SERCOM0 PAD2 |
| Pin 14 | PA11 — GPIO / AIN9 / SERCOM0 PAD3 |
| Pin 15 | PA12 — GPIO / SERCOM1 PAD0 |
| Pin 16 | PA13 — GPIO / SERCOM1 PAD1 |
| Pin 17 | PA14 — GPIO / SERCOM1 PAD2 |
| Pin 18 | PA15 — GPIO / SERCOM1 PAD3 |
| Pin 19 | PA16 — GPIO / SERCOM2 PAD0 |
| Pin 20 | PA17 — GPIO / SERCOM2 PAD1 |
| Pin 21 | PA18 — GPIO / SERCOM2 PAD2 |
| Pin 22 | PA19 — GPIO / SERCOM2 PAD3 |
| Pin 23 | PA20 — GPIO / SERCOM3 PAD0 |
| Pin 24 | PA21 — GPIO / SERCOM3 PAD1 |
| Pin 25 | PA22 — GPIO / SERCOM3 PAD2 |
| Pin 26 | PA23 — GPIO / SERCOM3 PAD3 |
| Pin 27 | PA24 — GPIO / USB_DM |
| Pin 28 | PA25 — GPIO / USB_DP |
| Pin 29 | GND — Ground |
| Pin 30 | VDDIO — Digital I/O supply |
| Pin 31 | RESET — Reset input (active low) |
| Pin 32 | SWDIO — SWD data / GPIO |
Typical Applications
ATSAMD21E17L-MFT is suitable for 7 applications: USB HID Peripherals, Automotive Interior Lighting, IoT Sensor Hubs, Smart Metering, Consumer Wearables, Home Automation Controllers, Capacitive Touch Interfaces.
USB HID Peripherals
The ATSAMD21E17L-MFT is a strong fit for USB Human Interface Device designs - mice, custom keyboards, and game controllers - because it integrates a USB 2.0 full-speed device controller with an internal transceiver, eliminating external PHY circuitry. Its 48 MHz Cortex-M0+ core handles HID-class polling and LED/PWM driving without taxing the bus, while 128 KB flash accommodates USB stacks plus HID descriptors and macros. The 32-VQFN footprint supports compact enclosures; route the 90-ohm differential pair and tie D- low at reset to enumerate bus-powered. Unlike parts that require external crystals for USB, the SAMD21's 48 MHz DFLL auto-trims from the USB SOF packet, saving BOM cost.
Recommended
Automotive Interior Lighting
The ATSAMD21E17L-MFT is AEC-Q100 qualified and rated -40 C to +125 C, making it a strong fit for automotive interior lighting - ambient strips, dome modules, and dynamic turn signals. Six SERCOM modules drive multiple LED driver ICs (such as the LP8863 or TPS929120) over SPI/I2C while the 12-bit ADC samples ambient light and the 10-bit DAC drives color-mixing references. The 32-VQFN exposed pad supports sustained LED-driving PWM without throttling. Its low-power SleepWalking and event system keep the MCU idle until lighting events occur, reducing quiescent draw on the always-on automotive battery rail.
Recommended
IoT Sensor Hubs
The ATSAMD21E17L-MFT fits IoT sensor hub designs that aggregate multiple environmental sensors and forward data over BLE/UART/Wi-Fi. Its six SERCOMs handle simultaneous I2C sensor reads (temperature, humidity, gas) and a UART link to an ESP32 or RN4871 wireless module. The 128 KB flash holds a sensor-fusion pipeline plus a TLS-capable MQTT client, while 16 KB SRAM supports multi-sensor buffers. Its 1.62 V minimum supply extends battery life on coin-cell and energy-harvested designs; the 32-VQFN footprint minimizes PCB area in space-constrained smart-home sensors.
Recommended
Smart Metering
The ATSAMD21E17L-MFT serves smart electricity, water, and gas metering designs where extended temperature and reliability are critical. Its 12-bit ADC at up to 350 ksps captures voltage and current waveforms with adequate dynamic range for class-1 meter accuracy, while the RTC with 32.768 kHz crystal keeps accurate time-stamping across power outages. The 128 KB flash stores firmware, calibration, and rolling load-profile buffers; the AEC-Q100 qualification supports deployments in outdoor cabinets. Its low-power modes extend battery life in gas and water meters that operate for over a decade on a primary cell.
Recommended
Consumer Wearables
The ATSAMD21E17L-MFT targets consumer wearables such as fitness bands, smart rings, and hearables where its 48 MHz Cortex-M0+ delivers responsive UI while SleepWalking peripherals minimize quiescent draw. The on-chip PTC supports capacitive touch buttons and sliders without an external touch IC, and the 12-bit ADC reads Li-ion battery voltage and photoplethysmography sensors. The 32-VQFN 5x5 mm footprint fits inside a watch module; the AEC-Q100 qualification adds headroom for skin-contact thermal loads that exceed typical consumer ratings.
Recommended
Home Automation Controllers
The ATSAMD21E17L-MFT supports home automation controllers that integrate Z-Wave/Zigbee/Matter bridges, HVAC thermostats, and security keypads. Its six SERCOMs bridge multiple protocol ICs and external EEPROM/flash, while the 12-bit ADC reads temperature, humidity, and PIR sensor outputs. The 128 KB flash holds Matter/Thread stacks plus application logic; 16 KB SRAM supports OTA staging buffers. The RTC keeps accurate wall-clock time across brown-outs and power cycles typical in whole-home installations.
Recommended
Capacitive Touch Interfaces
The ATSAMD21E17L-MFT integrates Microchip's Peripheral Touch Controller (PTC) supporting mutual-capacitance touch sensing, ideal for appliance front panels, induction cooktops, and industrial HMIs. Up to 256 touch channels via the PTC matrix handle slider, wheel, and button patterns without an external touch controller. The 12-bit ADC samples auxiliary analog inputs while the SERCOMs drive display SPI/I2C. The AEC-Q100 qualification supports appliance-grade environmental requirements and the -40C to +125C range covers cooktop-adjacent enclosures.
Recommended
Recommended Products Summary
Engineering reference data for ATSAMD21E17L-MFT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAMD21E17L-AFT | ATSAMD21E17A-MFT | ATSAMD21E17A-MF | ATSAMD21E17A-AU | ATSAMD21E16B-MU |
|---|---|---|---|---|---|---|
| Package | 32-VQFN (5x5 mm) | 32-VQFN (5x5 mm) - same | 32-VQFN (5x5 mm) - same | 32-VQFN (5x5 mm) - same | 32-VQFN (5x5 mm) - same | 32-VQFN (5x5 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 128 KB | 128 KB | 128 KB | 128 KB | 128 KB | 64 KB |
| SRAM | 16 KB | 16 KB | 16 KB | 16 KB | 16 KB | 8 KB |
| Maximum Clock Speed | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Temperature Grade | -40C to +125C (L) | -40C to +125C (L) | -40C to +85C (A) | -40C to +85C (A) | -40C to +85C (A) | -40C to +85C (B) |
| AEC-Q100 Qualified | Yes | Yes | No (industrial) | No (industrial) | No (industrial) | No (industrial) |
| USB Controller | USB 2.0 FS Device | USB 2.0 FS Device | USB 2.0 FS Device | USB 2.0 FS Device | USB 2.0 FS Device | USB 2.0 FS Device |
Key Differentiators
- Extended temperature (-40C to +125C) for automotive/lighting (vs ATSAMD21E17A-MFT)
- Largest flash tier in the SAM D21E 32-VQFN family (vs ATSAMD21E16B-MU)
- AEC-Q100 qualified SAM D21 in 32-VQFN (vs ATSAMD21E17A-AU)
Design Notes
Decouple VDDIO and VDDIN with a 100 nF X7R capacitor placed within 3 mm of each pin, plus a bulk 4.7 uF or 10 uF ceramic. Per the SAM D21 datasheet, VDDIO and VDDIN may share a common rail but AVDD must have its own 100 nF decoupling cap tied to the same source. Avoid routing digital signals under the exposed pad; stitch the EP to ground with at least 4 thermal vias for adequate heat dissipation when running the CPU at full 48 MHz with active peripherals.
Route the USB DP+ line as a 90-ohm differential pair with a continuous ground reference on the layer below; keep the trace length under 50 mm to maintain signal integrity. Place the 33 ohm series resistors on D+ and D- as close to the MCU as possible. Tie D- low through a divider (typically 2K2 to VBUS and 2K2 to GND on a bus-powered design) so the host enumerates full-speed correctly. Isolate the crystal traces (XIN/XOUT) with a ground guard ring to prevent coupling to USB signals.
Do not apply VDDIO > 3.63 V - the SAM D21 family has a 3.63 V absolute maximum and ESD clamping may engage above this. For AEC-Q100 systems, follow the Microchip SAM D21E errata DS80000763 carefully: the DAC has known output load sensitivity, and the ADC requires averaging or oversampling for high-accuracy conversions. When migrating code from ATSAMD21E18 (256 KB) to E17 (128 KB), verify linker scripts because the flash is half the size and the boot-loader section may need to be relocated.
Compliance Information
AEC-Q100 qualified per Microchip product listing. RoHS and REACH compliant. Halogen-free per Microchip material declaration. For full automotive PPAP documentation, request from Microchip with part number ATSAMD21E17L-MFT.
