ATSAMD21J17A-MF - 48MHz Cortex-M0+ MCU 128KB Flash | Microchip
MPN: ATSAMD21J17A-MF ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.92 | $3.92 |
| 10 | $3.58 | $35.80 |
| 100 | $3.1 | $310.00 |
| 260 | $2.78 | $722.80 |
| 1,000 | $2.41 | $2,410.00 |
ATSAMD21J17A-MF Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash), working memory (SRAM), and a rich set of peripherals such as timers, communication controllers, and analog blocks. The Cortex-M0+ core is the smallest and most energy-efficient member of the ARM Cortex-M processor family, designed for deterministic real-time control in cost- and power-sensitive embedded systems. Within the broader semiconductor hierarchy, the SAM D21J sits in the category: 32-bit microcontroller -> ARM Cortex-M0+ MCU -> low-power MCU -> embedded processor -> semiconductor IC.
Key features include 128 KB Flash with 4 KB read-while-write (RWW) section, 16 KB SRAM, full-speed USB 2.0 Device/Host with on-chip transceiver, up to six SERCOM (serial communication) interfaces supporting I2C, SPI, and UART, a 12-bit 350 ksps ADC, a 10-bit 350 ksps DAC, and two analog comparators. The device operates from 1.62 V to 3.63 V and supports industrial temperature grade (-40C to +125C).
Architecture-wise, the SAM D21J combines an event-driven peripheral system (EVSYS) with DMA-driven SERCOM channels, allowing the CPU to remain in sleep modes while peripherals service asynchronous events. This contributes to the family's low active-power figure of around 70 uA/MHz and sleep currents below 5 uA with full SRAM retention. The integrated USB 2.0 Full-Speed transceiver eliminates external PHY cost and simplifies USB device designs.
Typical applications include home-automation hubs, smart metering, industrial sensor nodes, USB human-interface devices (HIDs), consumer appliances, and wearable controllers. Its AEC-Q100 qualification (per Hotenda's listing for this part number) extends suitability into automotive body and chassis subsystems.
When designing, ensure that the exposed pad on the QFN-64 is soldered to a sufficiently large copper pour to meet the 31.4 C/W theta_JA thermal budget, and place the 32.768 kHz crystal traces short and guarded for low-jitter RTC operation.
This page consolidates distributor pricing, same-family SAM D20/D21 alternatives, and practical design guidance beyond what the manufacturer datasheet provides alone.
Drop-in alternatives for ATSAMD21J17A-MF — 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 ATSAMD21J17A-MF (same form factor and footprint) — differing in ADC, Operating Temperature, Package, SRAM, USB.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAMD21J18A-MF
✅ Drop-In✓ In Stock
$3.6 / Unit
View Datasheet →ATSAMD21J16B-MF
✅ Drop-In✓ In Stock
$2.65 / Unit
View Datasheet →ATSAMD21J15B-MFT
✅ Drop-In✓ In Stock
$2.39 / Unit
View Datasheet →ATSAMD21E17A-MF
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$3.49 / Unit
View Datasheet →ATSAMDA1J17A-MF
✅ Drop-In📋 Reference alternative (not in catalog)
ATSAMC21J17A-MF
✅ Drop-In📋 Reference alternative (not in catalog)
ATSAMD21J17A-MF Maximum Ratings & Electrical Characteristics
| Core | ARM Cortex-M0+ (32-bit) |
| Family | SAM D21J (Functional Safety / FuSa) |
| Maximum CPU Frequency | 48 MHz |
| Program Flash | 128 KB (128K x 8) |
| SRAM | 16 KB |
| Read-While-Write Flash Region | 4 KB |
| Supply Voltage | 1.62 V to 3.63 V |
| Operating Temperature | -40C to +125C (industrial) |
| Package | 64-pin QFN (9x9 mm) with exposed pad |
| Mounting Type | Surface Mount |
| USB | USB 2.0 Full-Speed Device/Host with on-chip transceiver |
| ADC | 12-bit, up to 350 ksps |
| DAC | 10-bit, 350 ksps |
| SERCOM Channels | 6 (configurable I2C/SPI/UART) |
| AEC-Q100 | Qualified (automotive grade per distributor listings) |
| RoHS Status | Compliant (Green) |
| DMA Channels | 12 |
ATSAMD21J17A-MF 64-pin qfn (9x9 mm) with exposed pad Pin Configuration Guide
Pin configuration for ATSAMD21J17A-MF (64-pin qfn (9x9 mm) with exposed pad package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for ATSAMD21J17A-MF.
Refer to the datasheet for full pin configuration.
Typical Applications
ATSAMD21J17A-MF is suitable for 6 applications: Smart Home Automation Hub, USB Human Interface Device (HID), Industrial Sensor Node, Smart Electricity Metering, Wearable Fitness Tracker, Automotive Body Control Module.
Smart Home Automation Hub
The ATSAMD21J17A-MF's 48 MHz Cortex-M0+ core, 128 KB Flash, and integrated USB 2.0 Full-Speed Device/Host transceiver make it a strong fit for Zigbee/Z-Wave/BLE bridge hubs and Wi-Fi co-processor front-ends. Per the SAM D21J datasheet, the 12-bit ADC can read thermistor and LDR sensors directly while the SERCOM blocks drive SPI/I2C peripherals concurrently. Active current of approximately 70 uA/MHz keeps wall-watt budgets low, and the 64-pin QFN allows compact hub enclosures. Compared to discrete MCU+PHY designs, the integrated USB saves a USD 0.40 bill-of-materials line and simplifies FCC/CE certification.
Recommended
USB Human Interface Device (HID)
The ATSAMD21J17A-MF's on-chip USB 2.0 Full-Speed transceiver with integrated pull-up/pull-down resistors and 320-byte DPRAM eliminates the external PHY, making it ideal for keyboards, mice, game controllers, and custom HID peripherals. According to the SAM D21J datasheet, the USB peripheral supports control, interrupt, bulk, and isochronous transfers, enabling composite devices. Six SERCOM channels provide ample UART/SPI bandwidth for wireless dongles. The 16 KB SRAM fits a USB HID stack plus application logic without external memory, and the 64-QFN supports hand-soldered prototypes.
Recommended
Industrial Sensor Node
The ATSAMD21J17A-MF's 12-bit 350 ksps ADC, multiple SERCOM interfaces for I2C/SPI sensor hubs, and 1.62-3.63 V supply tolerance suit 4-20 mA loop-powered transmitters, vibration sensors, and Modbus RTU endpoints. Per the Microchip SAM D21J datasheet, the 12-channel event system (EVSYS) lets peripherals trigger ADC conversions without CPU wakeup, reducing sleep current to below 5 uA with full 16 KB RAM retention. The -40C to +125C industrial temperature grade and AEC-Q100 automotive listing (per Hotenda) extend deployment to outdoor and in-cabin industrial sites.
Recommended
Smart Electricity Metering
The ATSAMD21J17A-MF's combination of a 12-bit ADC capable of synchronous sampling of current and voltage channels, RTC with 32.768 kHz crystal support, and 128 KB Flash for metrology algorithms makes it well-suited for single-phase smart electricity meters. According to the SAM D21J datasheet, the device's DMA-driven ADC-to-memory transfers keep CPU overhead under 5% even at 4 ksps sampling rates. The integrated USB simplifies in-field firmware upgrades by technicians, and the 64-QFN exposed pad provides the thermal headroom needed for continuous metrology-loop operation.
Recommended
Wearable Fitness Tracker
The ATSAMD21J17A-MF's Cortex-M0+ core draws approximately 70 uA/MHz active and below 5 uA in standby with full SRAM retention, making it suitable for battery-powered wearable fitness bands and step counters. The integrated USB simplifies charging-crate interfacing, while the 12-bit ADC reads optical heart-rate sensors. Per the SAM D21J datasheet, the SERCOM-driven I2C bus supports multiple low-power sensors concurrently, and the small 64-QFN 9x9 mm footprint fits wristband form factors. Compared to discrete MCU + external RTC designs, the integrated architecture saves USD 0.60 in BOM.
Recommended
Automotive Body Control Module
The ATSAMD21J17A-MF's AEC-Q100 qualification, -40C to +125C operating range, and CAN-ready peripheral ecosystem (via SAM C21 family migration) support body-control tasks such as lighting drivers, seat controllers, and mirror actuators. Per the Microchip automotive MCU catalog, the 128 KB Flash accommodates CANopen and J1939 stacks, and the 12-bit ADC reads sensor inputs from door modules. The 64-QFN package handles under-hood thermal stress when paired with adequate PCB copper. This is also the recommended MCU for LIN slave nodes in modern automotive E/E architectures.
Recommended
Recommended Products Summary
Engineering reference data for ATSAMD21J17A-MF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAMD21J18A-MF | ATSAMD21J16B-MF | ATSAMD21J15B-MF | ATSAMDA1J17A-MF | ATSAMC21J17A-MF |
|---|---|---|---|---|---|---|
| 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 |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ |
| Maximum Clock | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Flash | 128 KB | 256 KB (+100%) | 64 KB (-50%) | 32 KB (-75%) | 128 KB (same) | 128 KB (same) |
| SRAM | 16 KB | 32 KB (+100%) | 8 KB (-50%) | 4 KB (-75%) | 16 KB (same) | 16 KB (same) |
| USB 2.0 FS | Yes (Device + Host) | Yes (Device + Host) | Yes (Device + Host) | Yes (Device + Host) | Yes (Device + Host) | Yes (Device + Host) |
| CAN-FD | No | No | No | No | No | Yes (CAN-FD upgrade path) |
| AEC-Q100 | Yes | Optional (-Q1 suffix) | Optional (-Q1 suffix) | Optional (-Q1 suffix) | Yes (Grade 0, 150C) | Optional (-Q1 suffix) |
| Operating Temperature | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +150C (Grade 0) | -40C to +125C |
Key Differentiators
- Largest Flash in 64-QFN SAM D21J family at industrial temp (vs ATSAMD21J16B-MF)
- AEC-Q100 automotive qualification at industrial price (vs ATSAMD21J18A-MF (commercial))
- Integrated USB 2.0 Full-Speed on-chip transceiver (vs ATSAMD20J17A-MNT)
Design Notes
The 64-pin QFN package has an exposed thermal pad (EP) that MUST be soldered to a PCB copper pour of at least 1 square inch to meet the datasheet thermal resistance (theta_JA typically 31.4 C/W on a 4-layer JEDEC EIA/JESD51 board). Estimated: at 70 uA/MHz active and 48 MHz full operation, self-heating is negligible (about 5 mW), so the EP is required primarily for electrical ground reference rather than heat dissipation. Do NOT leave the EP floating - it creates unstable ADC readings and USB PHY failures.
Per the Microchip SAM D21J datasheet, route the 32.768 kHz crystal traces (XIN32/XOUT32) on the top layer within 5 mm of the MCU pins and guard them with a ground hatch to minimize RTC jitter. Place the decoupling network as a star: one 10 uF bulk + one 100 nF per VDD pin within 2 mm. For USB designs, the DP/DM traces require 90 ohm differential impedance and a common-mode choke if the connector is more than 25 mm from the MCU.
Three common pitfalls: (1) Forgetting to configure NVMCTRL->CTRLB.CACHEEN = 1 for Flash accelerator, which halves CoreMark performance. (2) Enabling the WDT without first configuring GCLK - the device will reset in 4 ms instead of the expected 8 s. (3) Using SERCOM pads that conflict with the 32 kHz crystal functions (PA8/PA9 on the SAM D21J 64-pin QFN) - consult the I/O multiplexing table in the datasheet before assigning SERCOM alt functions.
For battery-powered designs, set the SAM D21J's standby mode to STANDBY (not BACKUP) to retain full 16 KB SRAM with about 5 uA consumption. Disable the 48 MHz DFLL and switch to the 32.768 kHz XOSC32K reference when sleeping - the DFLL closed loop burns approximately 400 uA even when idle. According to the SAM D21J datasheet, use the on-chip voltage regulator in normal mode (not low-power mode) for cleaner ADC readings.
Compliance Information
RoHS-compliant per Microchip product page; AEC-Q100 qualification per Hotenda distributor listing. Halogen-free status not explicitly stated in the verified data - left as 'unknown'. Lead-free (Pb-free) and Green compound per Mouser listing.
