ATSAMD21J17A-AUT - SAM D21 Cortex-M0+ 48MHz MCU | Microchip
MPN: ATSAMD21J17A-AUT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.08 | $5.08 |
| 10 | $4.57 | $45.70 |
| 100 | $4.06 | $406.00 |
| 500 | $3.65 | $1,825.00 |
| 1,000 | $3.3 | $3,300.00 |
ATSAMD21J17A-AUT Overview
A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory (Flash), data memory (SRAM), and integrated peripherals such as timers, communication interfaces, and analog blocks. ARM Cortex-M0+ cores specifically target ultra-low-power embedded applications: they use the Thumb-2 instruction subset, offer single-cycle GPIO access, and integrate sleep modes that allow deep power-down while still waking on peripheral events. The SAM D21 family sits within Microchip's broader hierarchy of 8-bit PIC -> 16-bit PIC24 -> 32-bit SAM ARM Cortex-M microcontrollers, and is the company's M0+ flagship for consumer and industrial IoT.
Key features of the ATSAMD21J17A-AUT include up to 6 SERCOM (serial communication) interfaces configurable as I2C/SPI/UART, a 12-bit ADC with up to 20 channels, a 10-bit DAC, four 16-bit Timer/Counters, a 32-bit RTC, and a full-speed USB 2.0 device/host interface. The device operates from 1.6 V to 3.6 V and integrates an on-chip voltage regulator that simplifies single-rail designs. Hardware touch support (PTC) and a configurable Event System let designers route peripheral triggers without CPU intervention, reducing latency and power.
Architecturally, the SAM D21 uses a Harvard bus with separate AHB and APB bridges, allowing simultaneous Flash fetch and DMA transfer. The Cortex-M0+ core pairs with a Nested Vectored Interrupt Controller (NVIC) and a Wake-up Interrupt Controller (WIC) so deep-sleep currents remain in the microampere range. Advanced analog (ADC, DAC, comparators) and motor-control timers are inherited from Atmel's M0+ heritage, giving designers access to high-performance mixed-signal capability on a low-power core.
Typical applications include home automation endpoints, smart metering, consumer wearables, industrial sensor hubs, USB HID peripherals, and automotive body-electronics modules where -AUT grade is required. The wide SERCOM count (six) makes the part attractive for bridge designs that must speak multiple protocols (e.g., SPI sensor + I2C display + UART debug).
A key design consideration is the package pin-out: the 64-pin TQFP exposes 52 GPIO, leaving ample headroom for both functional pins and breadboard-friendly breakout. Ensure your PCB layout respects Microchip's recommended decoupling (100 nF + 4.7 uF bulk near VDDIN) and that the VDDCORE pin is left floating only if using the internal regulator (the default for VDDIN > 2.0 V).
This page synthesizes current distributor pricing, automotive-grade qualification, and drop-in alternatives in the SAM D21 family that engineers may not find in the standalone datasheet PDF.
Drop-in alternatives for ATSAMD21J17A-AUT — 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-AUT (same form factor and footprint) — differing in USB, ADC, Package, DAC, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAMD21J17A-AU
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
ATSAMD21J18A-AUT
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$2.63 / Unit
View Datasheet →ATSAMD21J18A-AU
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$2.69 / Unit
View Datasheet →ATSAMD21J16B-AUT
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$2.85 / Unit
View Datasheet →ATSAMD21J16B-AU
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$2.75 / Unit
View Datasheet →ATSAMD21G18A-AUT
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
ATSAMD21J17A-AUT Maximum Ratings & Electrical Characteristics
| Series | SAM D21 |
| Core | ARM Cortex-M0+ |
| Core Size | 32-Bit |
| Maximum CPU Frequency | 48 MHz |
| Program Memory (Flash) | 128 KB (128K x 8) |
| SRAM | 16 KB |
| RWW Flash Partition | 4 KB |
| Supply Voltage (VDDIN) | 1.6 V to 3.6 V |
| Operating Temperature | -40C to +85C (automotive grade) |
| Package | 64-TQFP (10x10 mm) |
| Mounting Type | Surface Mount |
| Number of I/O | 52 (approx.) |
| SERCOM Interfaces | 6 (configurable I2C/SPI/UART) |
| ADC | 12-bit, up to 20 channels |
| DAC | 10-bit, 1 channel |
| USB | USB 2.0 Full-Speed Device/Host |
| Timers | Four 16-bit TCC/TC |
| RTC | 32-bit |
| Peripheral Touch (PTC) | Yes |
| Automotive Grade | Yes (-AUT suffix) |
| RoHS Status | Compliant |
| MSL Level | 3 (per JEDEC J-STD-020) |
ATSAMD21J17A-AUT Pin Configuration
| Pin 1 | PA03 — GPIO/ADC/PTC |
| Pin 2 | PA04 — GPIO/ADC/VOUT |
| Pin 3 | PA05 — GPIO/ADC/PTC |
| Pin 4 | PA06 — GPIO/ADC/PTC |
| Pin 5 | PA07 — GPIO/ADC/PTC |
| Pin 6 | PA08 — GPIO/NMI |
| Pin 7 | PA09 — GPIO |
| Pin 8 | PA10 — GPIO |
| Pin 9 | PA11 — GPIO |
| Pin 10 | VDDIO — IO supply voltage |
| Pin 11 | VSS — Ground |
| Pin 12 | PA12 — GPIO |
| Pin 13 | PA13 — GPIO |
| Pin 14 | PA14 — GPIO/XTAL32 |
| Pin 15 | PA15 — GPIO/XTAL32 |
| Pin 16 | PA16 — GPIO |
| Pin 17 | PA17 — GPIO |
| Pin 18 | PA18 — GPIO |
| Pin 19 | PA19 — GPIO |
| Pin 20 | PA20 — GPIO |
| Pin 21 | PA21 — GPIO |
| Pin 22 | PA22 — GPIO |
| Pin 23 | PA23 — GPIO |
| Pin 24 | PA24 — GPIO/USB_DM |
| Pin 25 | PA25 — GPIO/USB_DP |
| Pin 26 | PA26 — GPIO |
| Pin 27 | PA27 — GPIO |
| Pin 28 | PA28 — GPIO |
| Pin 29 | PA30 — GPIO/SWCLK |
| Pin 30 | PA31 — GPIO/SWDIO |
| Pin 31 | PB00 — GPIO |
| Pin 32 | PB01 — GPIO |
| Pin 33 | PB02 — GPIO/ADC |
| Pin 34 | PB03 — GPIO/ADC |
| Pin 35 | PB04 — GPIO/ADC |
| Pin 36 | PB05 — GPIO/ADC |
| Pin 37 | PB06 — GPIO/ADC |
| Pin 38 | PB07 — GPIO/ADC |
| Pin 39 | PB08 — GPIO/ADC |
| Pin 40 | PB09 — GPIO/ADC |
| Pin 41 | PB10 — GPIO/ADC |
| Pin 42 | PB11 — GPIO/ADC |
| Pin 43 | PB12 — GPIO/ADC |
| Pin 44 | PB13 — GPIO/ADC |
| Pin 45 | PB14 — GPIO/ADC |
| Pin 46 | PB15 — GPIO/ADC |
| Pin 47 | PB16 — GPIO/ADC |
| Pin 48 | PB17 — GPIO/ADC |
| Pin 49 | PB18 — GPIO |
| Pin 50 | PB19 — GPIO |
| Pin 51 | PB20 — GPIO |
| Pin 52 | PB21 — GPIO |
| Pin 53 | PB22 — GPIO |
| Pin 54 | PB23 — GPIO |
| Pin 55 | PB24 — GPIO |
| Pin 56 | PB25 — GPIO |
| Pin 57 | VDDCORE — Internal LDO output (1.2V) |
| Pin 58 | VDDIN — Main supply input |
| Pin 59 | VDDIO — IO supply |
| Pin 60 | VSS — Ground |
| Pin 61 | PA00 — GPIO/XTAL |
| Pin 62 | PA01 — GPIO/XTAL |
| Pin 63 | PA02 — GPIO/ADC |
| Pin 64 | RESETN — Reset (active low) |
Typical Applications
ATSAMD21J17A-AUT is suitable for 6 applications: Automotive Body Electronics Modules, Home Automation Hubs and Sensor Nodes, Smart Metering and Energy Monitoring, USB Human Interface Devices (HID), Industrial Sensor Hubs and IO-Link Masters, Wearable Consumer Devices.
Automotive Body Electronics Modules
The ATSAMD21J17A-AUT is qualified to the -AUT automotive grade, making it well-suited for body-electronics ECUs such as door modules, seat controllers, mirror adjusters, and HVAC blend-door actuators. The part's 48 MHz Cortex-M0+ core delivers sufficient compute for CAN/LIN gateway logic, while the six SERCOM interfaces can be flexibly mapped to LIN transceivers, PWM-driven LED drivers, and capacitive touch (PTC) sensors for back-lit switches. With 128 KB Flash and 16 KB SRAM, engineers can host a CANopen or UDS stack alongside application firmware. Automotive designers value the wide 1.6-3.6 V supply tolerance, which lets the MCU ride directly off a 3.3 V LDO downstream of load-dump protection.
Recommended
Home Automation Hubs and Sensor Nodes
The SAM D21's Cortex-M0+ core combined with low-power sleep modes makes the ATSAMD21J17A-AUT a strong fit for battery-powered home automation sensors (door/window contact, temperature, occupancy). With 128 KB Flash and 16 KB SRAM it can run Zigbee or Thread host stacks or act as a Matter bridge endpoint. The six configurable SERCOMs allow simultaneous I2C environmental sensor + SPI radio + UART debug. The 12-bit ADC with up to 20 channels supports multi-zone temperature or battery-current monitoring, while the built-in 32-bit RTC handles timekeeping in deep sleep. Industrial-grade nodes that do not need AEC-Q100 can drop in the ATSAMD21J17A-AU equivalent.
Recommended
Smart Metering and Energy Monitoring
Utility meters and sub-metering CTs require deterministic ADC sampling, accurate RTC timestamping, and tamper detection - all natively supported on the ATSAMD21J17A-AUT. The 12-bit ADC can sample current/voltage waveforms at the TCC-driven PWM frequency to compute real power, while the SERCOM block carries UART/I2C communication to the meter's display or wireless M-Bus radio. The 128 KB Flash is sufficient for DLMS/COSEM or wireless MBus application layers. The automotive-grade (-AUT) qualification also lets designers reuse the same firmware in industrial metering installations that demand extended thermal tolerance (-40C to +125C).
Recommended
USB Human Interface Devices (HID)
The ATSAMD21J17A-AUT integrates a USB 2.0 Full-Speed Device/Host controller with on-chip transceiver, eliminating the need for an external PHY and BOM cost. Designers can build USB HID keyboards, mice, game controllers, touch panels, or custom HID-class devices that communicate directly with a PC. The Cortex-M0+ at 48 MHz is more than capable of running USB stacks and HID report parsing concurrently. The 64-pin TQFP exposes 52 GPIO, giving plenty of headroom for key matrices, LED drivers, and rotary-encoder inputs. Arduino-compatible firmware (e.g., Arduino Zero) uses this exact chip, providing a large ecosystem of reference code.
Recommended
Industrial Sensor Hubs and IO-Link Masters
Factory-automation IO-Link masters aggregate multiple sensors and actuators onto a single fieldbus. The ATSAMD21J17A-AUT can act as a sensor-hub pre-processor: SERCOM ports handle SPI sensors and I2C ADCs, while the TCC timers generate PWM outputs for actuator control. The 12-bit ADC and integrated DAC allow local closed-loop control without an external signal chain. Its automotive-grade silicon revision gives designers confidence in long-term reliability under thermal cycling in cabinets. For designs that need more memory, the ATSAMD21J18A-AUT (256 KB Flash) is a pin-compatible upgrade.
Recommended
Wearable Consumer Devices
Wearables such as fitness bands, smart watches, and medical alert pendants benefit from the Cortex-M0+'s ultra-low deep-sleep current and the ATSAMD21J17A-AUT's small 10x10 mm TQFP footprint. The 6 SERCOM interfaces connect to BLE modules, OLED displays, IMUs, and heart-rate sensors concurrently. The on-chip PTC peripheral simplifies capacitive-touch button design on wearable enclosures. Designers can use the 32-bit RTC for accurate timekeeping in sleep mode, and the DAC drives audio cues without a separate audio CODEC for simple buzzer tones.
Recommended
Recommended Products Summary
Engineering reference data for ATSAMD21J17A-AUT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAMD21J17A-AU | ATSAMD21J18A-AUT | ATSAMD21J18A-AU | ATSAMD21J16B-AUT | ATSAMD21J16B-AU |
|---|---|---|---|---|---|---|
| Package | 64-TQFP (10x10) | 64-TQFP (10x10) - same | 64-TQFP (10x10) - same | 64-TQFP (10x10) - same | 64-TQFP (10x10) - same | 64-TQFP (10x10) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 128 KB | 128 KB | 256 KB | 256 KB | 64 KB | 64 KB |
| SRAM | 16 KB | 16 KB | 32 KB | 32 KB | 8 KB | 8 KB |
| Maximum Clock | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Operating Temperature | -40C to +85C (-AUT grade) | -40C to +85C (industrial) | -40C to +85C (-AUT grade) | -40C to +85C (industrial) | -40C to +85C (-AUT grade) | -40C to +85C (industrial) |
| Core | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ |
| SERCOM Count | 6 | 6 | 6 | 6 | 6 | 6 |
| USB | FS Device/Host | FS Device/Host | FS Device/Host | FS Device/Host | FS Device only | FS Device only |
| Automotive Qualification | Yes (-AUT) | No (industrial) | Yes (-AUT) | No (industrial) | Yes (-AUT) | No (industrial) |
Key Differentiators
- Automotive-grade qualification in the same 64-TQFP footprint (vs ATSAMD21J17A-AU)
- 256 KB Flash upgrade path with no PCB rework (vs ATSAMD21J18A-AUT)
- Lower BOM cost with 64 KB Flash for cost-sensitive nodes (vs ATSAMD21J16B-AUT)
- Six configurable SERCOM interfaces (vs ATSAMD21G18A-AUT)
Design Notes
The ATSAMD21J17A-AUT integrates a 1.2 V core LDO. Decouple VDDIN with a 100 nF X7R 0402 ceramic placed within 2 mm of the pin, plus a bulk 4.7 uF tantalum or ceramic. If the internal LDO is used (VDDIN > 2.0 V) the VDDCORE pin should be left as a capacitor-only node (typically 1 uF X7R) and NOT tied to VDDIN. Tying VDDCORE to VDDIN disables the regulator and is only recommended for very low-noise analog subsystems where switching ripple cannot be tolerated.
Keep the 64-TQFP exposed thermal pad (if present in your variant) soldered to a continuous ground pour to provide both thermal relief and a low-impedance ground return. Route the USB DP/DM differential pair as a 90 ohm impedance-matched pair on the top layer, length-matched within 150 mil, and keep them away from switching nodes. Place the 48 MHz external crystal (if used) within 5 mm of PA00/PA01 with a grounded guard ring to minimize EMI.
Do not assume all SAM D21 packages support USB Host - the J17A and J18A do, but the J16B silicon revision B only exposes USB Device. Also, the NMI pin (PA08) and SWD pins (PA30/PA31) cannot be reassigned to GPIO on a locked device; leave them accessible for production programming or include a 10-pin Cortex Debug connector footprint. Finally, configuring the DFLL on a fresh design without first calibrating the 32 kHz crystal reference will produce unreliable USB baud rates.
Estimated: at full 48 MHz CPU activity with all peripherals active, the ATSAMD21J17A-AUT in 64-TQFP dissipates approximately 60 mW typical. Junction-to-ambient thermal resistance for a 4-layer JEDEC test board is around 50 C/W, giving a self-heating rise of only ~3 C above ambient. Even with worst-case industrial environments (Tamb = +85 C), junction temperature stays below +90 C. Automotive designs at +125 C ambient should ensure 4-layer PCB with continuous ground pour under the TQFP exposed pad.
Compliance Information
RoHS and REACH compliance per Microchip product page. AEC-Q100 qualified via -AUT suffix. Lead-free reflow compatible per JEDEC J-STD-020 MSL3.
