ATSAMD21E17L-AFT - 48MHz Cortex-M0+ MCU 128KB | Microchip
MPN: ATSAMD21E17L-AFT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.2 | $4.20 |
| 10 | $3.85 | $38.50 |
| 100 | $3.45 | $345.00 |
| 500 | $3.05 | $1,525.00 |
| 1,000 | $2.7 | $2,700.00 |
ATSAMD21E17L-AFT Overview
A microcontroller (MCU) is an integrated circuit that combines a processor core, program memory (Flash), data memory (SRAM), and a rich set of peripherals (timers, ADC, communication interfaces, GPIO) on a single silicon die. The ARM Cortex-M0+ is the smallest and most energy-efficient core in the Cortex-M family, designed for deterministic real-time control in cost- and power-sensitive embedded applications. Within the SAM D21 family, the ATSAMD21E17L-AFT is the AEC-Q100 automotive variant of the 128 KB Flash / 16 KB SRAM configuration, enabling direct deployment in vehicle electrical systems without additional qualification work.
Key features include 128 KB Flash with 4 KB RWW (Read-While-Write) auxiliary section, 16 KB SRAM, a 12-bit 350 ksps ADC with up to 10 channels, two analog comparators, a 10-bit DAC, six SERCOM (serial communication) modules configurable as UART/SPI/I2C, a 24-channel Event System, and a full-speed USB 2.0 device interface. Hardware touch support (PTC) and a 32-bit RTC round out the peripheral set. The 32-pin TQFP package offers ample GPIO for small-form-factor designs while retaining easy hand-solderability and inspection.
Architecturally, the ATSAMD21E17L-AFT uses Microchip's proprietary low-power process and the Cortex-M0+ v6-M architecture with single-cycle I/O access, providing excellent code density and interrupt response. The integrated voltage regulator and SERCOM peripheral multiplexing allow designers to reassign nearly every digital pin to multiple functions, simplifying PCB routing in space-constrained designs.
Typical applications include automotive body electronics, LIN/CAN node ECUs, LED lighting controllers, smart home and metering devices, industrial sensor hubs, and low-power IoT edge nodes. The functional safety features support designs targeting IEC 60730 and similar household appliance safety standards. The combination of low power consumption, deterministic real-time behavior, and automotive-grade qualification makes it suitable for harsh-environment deployments.
When designing with this MCU, ensure the 32-pin TQFP footprint includes a solid ground plane and decoupling capacitors (typically 100 nF plus 4.7 µF bulk) placed as close as possible to the VDDCORE and VDDIO pins. Use Microchip's Atmel START or MPLAB X IDE with the SAMD21 Device Family Pack (DFP) for code generation, and the SAME70 Xplained Pro or SAMD21 Xplained Pro boards for bring-up. Always validate AEC-Q100 grade expectations against your end-customer requirements before committing to volume production.
This page consolidates distributor pricing, drop-in alternative MPNs, and design notes that extend the manufacturer datasheet with engineering judgment useful for sourcing and PCB layout decisions.
Drop-in alternatives for ATSAMD21E17L-AFT — 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-AFT (same form factor and footprint) — differing in Package, ADC, USB, DAC, Core.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAMD21E17D-AF
✅ Drop-In✓ In Stock
$2.83 / Unit
View Datasheet →ATSAMD21E17A-AF
✅ Drop-In✓ In Stock
$2.34 / Unit
View Datasheet →ATSAMD21E17A-AU
✅ Drop-In✓ In Stock
$2.3 / 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 →ATSAMD21E17D-AF
✅ Drop-In✓ In Stock
$2.83 / Unit
View Datasheet →ATSAMD21E17L-AFT Maximum Ratings & Electrical Characteristics
| Core Architecture | ARM Cortex-M0+ (32-bit) |
| Maximum CPU Frequency | 48 MHz |
| Program Flash Memory | 128 KB (128K x 8) |
| SRAM | 16 KB |
| Auxiliary Flash (RWW) | 4 KB |
| Supply Voltage (VDDIN) | 1.6 V to 3.6 V |
| Operating Temperature Range | -40 °C to +125 °C (automotive AEC-Q100 Grade 1) |
| Package | 32-pin TQFP, 7 mm × 7 mm, 0.8 mm pitch |
| GPIO Count | Up to 26 (varies by package/function multiplex) |
| ADC | 12-bit, up to 350 ksps, up to 10 channels |
| DAC | 10-bit, 1 channel |
| Analog Comparators | 2 |
| SERCOM Modules | 6 (configurable as UART / SPI / I²C) |
| USB | USB 2.0 Full-Speed Device |
| Timers (TC / TCC) | 16-bit and 24-bit PWM/Timer |
| RTC | 32-bit RTC with calendar mode |
| Automotive Qualification | AEC-Q100 qualified |
| Functional Safety | FuSa features supported (IEC 60730 ready) |
| RoHS Status | Compliant |
| Mounting Type | Surface Mount |
| Delivery Form | Tape and Reel (suffix FT) |
ATSAMD21E17L-AFT Pin Configuration
| Pin 1 | PA00 — General-purpose I/O / SERCOM1 PAD0 / ADC AIN0 |
| Pin 2 | PA01 — General-purpose I/O / SERCOM1 PAD1 / ADC AIN1 |
| Pin 3 | PA02 — General-purpose I/O / SERCOM0 PAD0 / AIN2 / DAC VOUT |
| Pin 4 | PA03 — General-purpose I/O / SERCOM0 PAD1 / AIN3 / ADC reference |
| Pin 5 | PA04 — General-purpose I/O / SERCOM0 PAD2 / AIN4 / VOUT analog |
| Pin 6 | PA05 — General-purpose I/O / SERCOM0 PAD3 / AIN5 |
| Pin 7 | PA06 — General-purpose I/O / SERCOM0 PAD0 alt / AIN6 |
| Pin 8 | PA07 — General-purpose I/O / SERCOM0 PAD1 alt / AIN7 |
| Pin 9 | VDDIO — I/O supply voltage (1.6 V to 3.6 V) |
| Pin 10 | GND — Ground |
| Pin 11 | PA08 — General-purpose I/O / SERCOM2 PAD0 / NMI |
| Pin 12 | PA09 — General-purpose I/O / SERCOM2 PAD1 |
| Pin 13 | PA10 — General-purpose I/O / SERCOM2 PAD2 |
| Pin 14 | PA11 — General-purpose I/O / SERCOM2 PAD3 / USB D- |
| Pin 15 | VDDIO — I/O supply voltage (1.6 V to 3.6 V) |
| Pin 16 | GND — Ground |
| Pin 17 | PA14 — General-purpose I/O / SERCOM4 PAD2 |
| Pin 18 | PA15 — General-purpose I/O / SERCOM4 PAD3 |
| Pin 19 | PA16 — General-purpose I/O / SERCOM1 PAD0 alt / I²S SD |
| Pin 20 | PA17 — General-purpose I/O / SERCOM1 PAD1 alt / I²S MCK |
| Pin 21 | PA18 — General-purpose I/O / SERCOM1 PAD2 / I²S SCK |
| Pin 22 | PA19 — General-purpose I/O / SERCOM1 PAD3 / I²S FS |
| Pin 23 | PA20 — General-purpose I/O / SERCOM3 PAD0 / TCC0 |
| Pin 24 | PA21 — General-purpose I/O / SERCOM3 PAD1 / TCC0 |
| Pin 25 | PA22 — General-purpose I/O / SERCOM3 PAD2 / TCC0 |
| Pin 26 | PA23 — General-purpose I/O / SERCOM3 PAD3 / USB D+ |
| Pin 27 | PA24 — General-purpose I/O / USB SOF 1 kHz / SERCOM5 PAD2 |
| Pin 28 | PA25 — General-purpose I/O / SERCOM5 PAD3 |
| Pin 29 | GND — Ground |
| Pin 30 | VDDIN — Main supply voltage input (1.6 V to 3.6 V) |
| Pin 31 | VDDCORE — Internal core voltage regulator output (decouple with 1 µF) |
| Pin 32 | RESET — Reset input (active low) / PA28 / SWDIO |
Typical Applications
ATSAMD21E17L-AFT is suitable for 7 applications: Automotive Body Electronics ECU, Smart LED Lighting Controller, Industrial Sensor Hub, USB HID Consumer Device, Battery-Powered IoT Edge Node, Household Appliance Control Board, Low-Cost Touch-Key User Interface.
Automotive Body Electronics ECU
The ATSAMD21E17L-AFT is well suited to automotive body-electronic control units such as door modules, seat controllers, HVAC blend-door drivers, and ambient lighting nodes. Its AEC-Q100 Grade 1 qualification and Functional Safety (FuSa) feature set reduce the additional qualification work normally required for IEC 60730 Class B compliance. The 32-pin TQFP package provides enough GPIO to drive relays, FETs, and LIN transceivers, while the six configurable SERCOM modules make it straightforward to add a LIN bus via an external TJA1027 transceiver and a CAN bus via an MCP2515 SPI controller. The 12-bit ADC and two analog comparators handle analog sensor inputs such as thermistors and current shunts without external signal conditioning.
Recommended
Smart LED Lighting Controller
In connected LED lighting applications, the ATSAMD21E17L-AFT combines Cortex-M0+ processing efficiency with multiple 16-bit TCC timer/counter channels for high-resolution PWM dimming, enabling smooth 0–100 % brightness curves without flicker. The 12-bit ADC samples ambient light or color sensors for closed-loop control, and the integrated 10-bit DAC can drive tunable-white or RGB reference voltages. The 128 KB Flash fits a full BLE/Zigbee stack if a co-processor such as the AT2560 is attached via SERCOM SPI, while the 16 KB SRAM is sufficient for protocol buffers and color-mapping lookup tables. The -40 °C to +125 °C automotive temperature grade also makes it acceptable for high-brightness outdoor fixtures.
Recommended
Industrial Sensor Hub
The ATSAMD21E17L-AFT is a strong fit for industrial 4–20 mA sensor hubs, Modbus RTU over RS-485 nodes, and low-power field transmitters. The Event System can route timer, ADC, and SERCOM events directly to peripherals without CPU intervention, keeping deterministic latency while leaving the Cortex-M0+ core free to run Modbus or proprietary protocols. Hardware crypto (AES-128) on the SAMD21E die secures data at the edge, and the 32-pin TQFP footprint is industry-friendly for hand-rework in the field. The wide 1.6–3.6 V supply range allows direct battery operation from 3.6 V primary lithium thionyl chloride cells.
Recommended
USB HID Consumer Device
Because the ATSAMD21E17L-AFT integrates a USB 2.0 Full-Speed device controller with an internal transceiver and pull-up, it can implement USB HID, CDC, or custom vendor-class peripherals without an external bridge chip. Common examples include custom keyboards, programmable keypads, data-acquisition probes, and diagnostic tools. The 48 MHz core executes USB polling at the required 1 ms frame interval with ample headroom for HID report processing, while the 128 KB Flash stores USB descriptors and a USB-MSD bootloader for field firmware upgrades. The 32-pin TQFP package is well suited to through-hole-style hand prototyping on daughterboards.
Recommended
Battery-Powered IoT Edge Node
The SAM D21E Family SleepWalking peripheral and Event System allow the ATSAMD21E17L-AFT to wake only when a sensor threshold is crossed, drawing a few microamps on average from a 3 V coin cell or primary Li-ion cell. The integrated RTC calendar supports time-stamped sensor logs that survive in the 16 KB SRAM across sleep, and the 4 KB auxiliary Flash acts as a wear-leveled EEPROM for configuration data. A typical node wakes every few seconds to sample a temperature sensor over SERCOM I²C, performs AES-128 encryption of the payload, and transmits via an attached AT2560 Bluetooth Low Energy module, then returns to deep sleep.
Recommended
Household Appliance Control Board
The Functional Safety (FuSa) library bundled with the ATSAMD21E17L-AFT accelerates IEC 60730 Class B certification for household appliances such as washing machines, dishwashers, and induction cooktops. The FuSa library provides pre-validated core self-tests, watchdog patterns, and clock-monitor routines, saving typically 3-6 months of safety engineering effort. The 32-pin TQFP package drives triac gates, zero-cross detectors, and rotary encoder inputs directly, while the 12-bit ADC reads temperature and current sense for closed-loop control. The 48 MHz core and 128 KB Flash handle user-interface graphics, motor-control algorithms, and a safety-certified bootloader in a single MCU.
Recommended
Low-Cost Touch-Key User Interface
The integrated Peripheral Touch Controller (PTC) on the ATSAMD21E17L-AFT supports driven-shield and mutual-capacitance touch sensing on up to 10 pins without an external touch IC, reducing BOM cost and PCB area for capacitive keypads and sliders. The 128 KB Flash and 16 KB SRAM comfortably host Microchip's QTouch library and the application logic, while the Event System offloads touch scanning from the CPU. Combined with a 32-pin TQFP that survives hand-soldering, this makes the MCU a strong choice for entry-level appliances, locks, and consumer products that need 4-12 touch keys plus a UART or I²C interface to a host MCU.
Recommended
Recommended Products Summary
Engineering reference data for ATSAMD21E17L-AFT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAMD21E17D-AF | ATSAMD21E17A-AF | ATSAMD21E17A-AU | ATSAMD21E17A-MFT |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 32-pin TQFP (7x7 mm) | 32-pin TQFP (7x7 mm) - same | 32-pin TQFP (7x7 mm) - same | 32-pin TQFP (7x7 mm) - same | 32-pin TQFP (7x7 mm) - same |
| Core / Architecture | ARM Cortex-M0+ 32-bit, 48 MHz | ARM Cortex-M0+ 32-bit, 48 MHz | ARM Cortex-M0+ 32-bit, 48 MHz | ARM Cortex-M0+ 32-bit, 48 MHz | ARM Cortex-M0+ 32-bit, 48 MHz |
| Flash / SRAM | 128 KB Flash / 16 KB SRAM | 128 KB Flash / 16 KB SRAM | 128 KB Flash / 16 KB SRAM | 128 KB Flash / 16 KB SRAM | 128 KB Flash / 16 KB SRAM |
| Operating Temperature | -40 °C to +125 °C (Automotive) | -40 °C to +85 °C (Industrial) | -40 °C to +85 °C (Industrial) | -40 °C to +85 °C (Industrial) | -40 °C to +85 °C (Industrial) |
| AEC-Q100 Qualification | Yes (Grade 1) | No (Industrial grade) | No (Industrial grade) | No (Industrial grade) | No (Industrial grade) |
| Functional Safety (FuSa) | Yes (IEC 60730 Class B library) | Yes (same die, same FuSa library) | Yes (same die, same FuSa library) | Yes (same die, same FuSa library) | Yes (same die, same FuSa library) |
| Supply Voltage | 1.6 V to 3.6 V | 1.6 V to 3.6 V | 1.6 V to 3.6 V | 1.6 V to 3.6 V | 1.6 V to 3.6 V |
| Delivery Form | Tape & Reel (FT) | Tape & Reel (FT) | Tape & Reel (FT) | Tray (U) | Tape & Reel (FT) |
| RoHS Compliance | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- AEC-Q100 Grade 1 with Functional Safety library support (vs ATSAMD21E17A-AF)
- Identical die and pinout to lower-cost industrial siblings (vs ATSAMD21E17D-AF)
- Tape-and-reel (FT) packaging optimized for high-volume SMT assembly (vs ATSAMD21E17A-AU)
- Full Microchip SAMD21 ecosystem support (vs Cross-brand Cortex-M0+ MCUs)
Design Notes
Place one 100 nF X7R decoupling capacitor adjacent to each VDD pin (pins 9, 15, 30) and a single 4.7 µF bulk capacitor on VDDIN. The internal VDDCORE regulator at pin 31 requires a 1 µF X7R ceramic within 2 mm of the pin to ensure stable regulation and to suppress the 48 MHz harmonics that could couple into analog lines. Estimated: at 48 MHz active current of approximately 7 mA and VDDIN of 3.3 V, the on-chip regulator dissipates only a few milliwatts and does not need thermal management.
Route the SWDIO and SWCLK signals (shared with PA27/PA28, mapped to RESET pin 32 and PA30 typically) as short parallel traces with a ground guard on both sides. Keep the 32 kHz crystal traces symmetric and surrounded by a grounded copper pour to minimize clock feedthrough to nearby ADC inputs. If USB is used, route the PA24/PA23 D+/D- pair as a 90 Ω differential with no stubs, and add a 4.7 µF tantalum plus 100 nF ceramic on the VBUS pin.
Do not leave unused SERCOM I/O pins floating - configure them as outputs driven low or as inputs with the internal pull-up enabled, because floating inputs can slowly transition through the linear region and draw milliamps of extra current. Similarly, the RESET pin must be pulled up externally with a 10 kΩ resistor to VDDIN if no external supervisor is used; the internal pull-up is weak and is not reliable in automotive environments with significant electrical transients per ISO 7637-2.
For designs that switch PWM outputs above 100 kHz, place a 22 Ω series resistor on each PWM pin to dampen transmission-line ringing into capacitive loads; this also reduces radiated emissions per CISPR 25 automotive EMC limits. Estimated: the 32-pin TQFP's lead inductance of approximately 1 nH combined with 5 pF of trace capacitance forms a 1.6 GHz resonant tank - without damping, this rings visibly at edges faster than 1 ns.
Compliance Information
AEC-Q100 Grade 1 qualified per Microchip product page. IEC 60730 Class B functional safety library available. RoHS and REACH compliance per Microchip material declarations.
