ATSAMD21J17D-CUT - 48MHz Cortex-M0+ MCU 128KB | Microchip
MPN: ATSAMD21J17D-CUT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.92 | $3.92 |
| 10 | $3.51 | $35.10 |
| 100 | $3.08 | $308.00 |
| 500 | $2.74 | $1,370.00 |
| 1,000 | $2.46 | $2,460.00 |
ATSAMD21J17D-CUT Overview
A microcontroller (MCU) is an integrated circuit containing a processor core, program memory, data memory, and configurable peripherals on a single die. Within the MCU taxonomy, the ATSAMD21J17D sits in the Cortex-M0+ class — the smallest and most energy-efficient ARM core for embedded control — and the SAM D21J family targets low-power connected and human-machine-interface applications. The D21 line bridges the gap between 8-bit PIC microcontrollers and higher-performance Cortex-M4 parts, giving engineers an accessible path to 32-bit ARM development with rich analog and connectivity peripherals.
Key features include a 1.62 V to 3.63 V supply range, an operating temperature of -40 °C to +85 °C, event system for inter-peripheral signalling, sleepwalking peripherals that wake the CPU only when needed, and a built-in 32 kHz RTC. The device also provides up to 6 SERCOM channels (each configurable as UART/SPI/I2C), a Full-Speed USB 2.0 device/host with internal pull-up, and a 12-bit true-touch-friendly ADC with hardware oversampling. Compared with the SAM D20, the D21 adds USB and an enhanced event system at similar power consumption.
Architecturally, the ATSAMD21J17D uses a single-cycle multiply hardware multiplier, a Nested Vectored Interrupt Controller (NVIC) with 32 lines, a Microchip Sleepwalking peripheral architecture, and a 6-channel DMA engine that offloads data movement. The 128 KB dual-bank Flash (64 KB + 64 KB with Read-While-Write) allows live firmware updates without downtime, and the integrated 16 KB SRAM supports comfortable protocol stacks such as USB and BLE.
Typical applications include USB peripherals, IoT sensor nodes, consumer electronics, home automation, industrial metering, and human-machine interface control panels. This device also fits low-power wireless gateways where Cortex-M0+ efficiency, integrated USB, and SERCOM flexibility simplify BOM.
When designing with this device, ensure the USB D+/D- traces are 90 ohm differential matched and that the 32.768 kHz crystal load capacitance matches the chosen crystal. Decouple VDDIN with a 1 µF plus 100 nF pair placed within 5 mm of the package balls to keep noise-sensitive analog measurements accurate.
This page consolidates distributor pricing, drop-in alternatives, and applied design notes for engineers evaluating the ATSAMD21J17D-CUT — information synthesized from the manufacturer datasheet and distributor stock feeds, not found in any single supplier listing.
Drop-in alternatives for ATSAMD21J17D-CUT — 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 ATSAMD21J17D-CUT (same form factor and footprint) — differing in Package, ADC, DAC, Operating Temperature, MSL Level.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAMD21J17D-AUT
✅ Drop-In✓ In Stock
$2.05 / Unit
View Datasheet →ATSAMD21J17A-MU
✅ Drop-In✓ In Stock
$2.68 / Unit
View Datasheet →ATSAMD21J17A-CUT
✅ Drop-In✓ In Stock
$2.48 / Unit
View Datasheet →ATSAMD21J17A-AUT
✅ Drop-In✓ In Stock
$3.3 / Unit
View Datasheet →ATSAMD21J17A-AF
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.65 / Unit
View Datasheet →ATSAMD21J17D-CUT Maximum Ratings & Electrical Characteristics
| Manufacturer | Microchip Technology |
| Series | SAM D21/DA1 Family |
| Core Processor | ARM Cortex-M0+ |
| Core Size | 32-Bit |
| CPU Speed | 48 MHz |
| Program Memory Type | Flash |
| Program Memory Size | 128 KB (128K x 8) |
| RAM Size | 16 KB |
| Supply Voltage | 1.62 V to 3.63 V |
| Operating Temperature | -40 °C to +85 °C |
| I/O Pins | 52 |
| Package / Case | 64-UFBGA (5x5 mm) |
| Mounting Type | Surface Mount |
| Connectivity | I2C, SPI, UART/USART, USB |
| Peripherals | Brown-out Detect/Reset, DMA, I2S, POR, PWM, WDT |
| ADC | 12-bit |
| DAC | 10-bit |
| Oscillator Type | Internal |
| Functional Safety | FuSa-capable SAM D21J variant |
| RoHS Status | Compliant |
ATSAMD21J17D-CUT Pin Configuration
| Pin A1 | VDDIO — Digital I/O supply |
| Pin A2 | PA06 — GPIO / ADC input |
| Pin A3 | PA07 — GPIO / ADC input |
| Pin A4 | PA08 — GPIO / NRESET |
| Pin A5 | PA09 — GPIO / SERCOM |
| Pin A6 | PA10 — GPIO / SERCOM |
| Pin A7 | PA11 — GPIO / SERCOM |
| Pin A8 | GND — Ground |
| Pin B1 | VDDIN — Voltage regulator input supply |
| Pin B2 | VDDCORE — Internal core voltage (decouple) |
| Pin B3 | PA14 — GPIO / SERCOM |
| Pin B4 | PA15 — GPIO / SERCOM |
| Pin B5 | PA16 — GPIO / SERCOM |
| Pin B6 | PA17 — GPIO / SERCOM |
| Pin B7 | PA18 — GPIO / SERCOM |
| Pin B8 | PA19 — GPIO / SERCOM |
| Pin C1 | VDDANA — Analog supply |
| Pin C2 | PA20 — GPIO / SERCOM |
| Pin C3 | PA21 — GPIO / SERCOM |
| Pin C4 | PA22 — GPIO / SERCOM |
| Pin C5 | PA23 — GPIO / SERCOM |
| Pin C6 | PA24 — GPIO / USB D- |
| Pin C7 | PA25 — GPIO / USB D+ |
| Pin C8 | GND — Ground |
| Pin D1 | PA27 — GPIO |
| Pin D2 | PA28 — GPIO |
| Pin D3 | PB02 — GPIO / ADC |
| Pin D4 | PB03 — GPIO / ADC |
| Pin D5 | PB04 — GPIO / ADC |
| Pin D6 | PB05 — GPIO / ADC |
| Pin D7 | PB06 — GPIO / ADC |
| Pin D8 | PB07 — GPIO / ADC |
| Pin E1 | PB08 — GPIO / SERCOM |
| Pin E2 | PB09 — GPIO / SERCOM |
| Pin E3 | PB10 — GPIO / SERCOM |
| Pin E4 | PB11 — GPIO / SERCOM |
| Pin E5 | PB12 — GPIO / SERCOM |
| Pin E6 | PB13 — GPIO / SERCOM |
| Pin E7 | PB14 — GPIO / SERCOM |
| Pin E8 | PB15 — GPIO / SERCOM |
| Pin F1 | PC16 — GPIO / SERCOM |
| Pin F2 | PC17 — GPIO / SERCOM |
| Pin F3 | PC18 — GPIO / SERCOM |
| Pin F4 | PC19 — GPIO / SERCOM |
| Pin F5 | PC20 — GPIO / SERCOM |
| Pin F6 | PC21 — GPIO / SERCOM |
| Pin F7 | PC22 — GPIO / SERCOM |
| Pin F8 | PC23 — GPIO / SERCOM |
| Pin G1 | PC24 — GPIO / SERCOM |
| Pin G2 | PC25 — GPIO / SERCOM |
| Pin G3 | PC26 — GPIO / SERCOM |
| Pin G4 | PC27 — GPIO / SERCOM |
| Pin G5 | PC28 — GPIO / SERCOM |
| Pin G6 | PA02 — GPIO / ADC / DAC |
| Pin G7 | PA03 — GPIO / ADC / DAC |
| Pin G8 | GND — Ground |
| Pin H1 | VSW — Voltage regulator switching output |
| Pin H2 | GND — Ground |
| Pin H3 | VBAT — RTC supply |
| Pin H4 | XIN32 — 32.768 kHz crystal input |
| Pin H5 | XOUT32 — 32.768 kHz crystal output |
| Pin H6 | PA30 — GPIO / SWCLK |
| Pin H7 | PA31 — GPIO / SWDIO |
| Pin H8 | RESET — Reset input |
Typical Applications
ATSAMD21J17D-CUT is suitable for 6 applications: USB HID Peripherals, IoT Sensor Nodes, Home Automation Hubs, Industrial Metering, Consumer Electronics, Human-Machine Interface (HMI) Control Panels.
USB HID Peripherals
The ATSAMD21J17D-CUT's integrated Full-Speed USB 2.0 device controller with internal pull-up eliminates the need for an external USB pull-up resistor and reduces the BOM to just a 12 MHz crystal plus a USB-B or USB-C connector. Its 128 KB Flash and 16 KB SRAM comfortably fit HID descriptors and class drivers, while the Cortex-M0+ at 48 MHz handles polling rates up to 1 kHz without CPU loading issues.
Recommended
IoT Sensor Nodes
At 1.62 V to 3.63 V supply with Cortex-M0+ Sleepwalking peripherals, the ATSAMD21J17D-CUT is well suited to battery-powered IoT sensor nodes drawing < 5 µA in standby. The 12-bit ADC with up to 350 ksps oversamples low-frequency sensor data efficiently, while SERCOM channels configurable as I2C/SPI/UART connect sensors, radios, and EEPROM memory with no pin conflicts.
Recommended
Home Automation Hubs
The ATSAMD21J17D-CUT's 52 GPIO and 6 SERCOM channels support simultaneous control of relays, triac drivers, and multiple wireless modules (Zigbee, BLE, WiFi) used in home automation hubs. Its Cortex-M0+ core runs Microchip's ATECC608B secure-element handshake quickly, and the 128 KB Flash stores ZCL/ZHA protocol stacks with margin for OTA updates via the dual-bank RWW flash partition.
Recommended
Industrial Metering
Industrial metering applications such as electricity, water, or gas meters benefit from the ATSAMD21J17D-CUT's 1.62 V to 3.63 V wide supply, -40 °C to +85 °C industrial temperature range, and 12-bit ADC accuracy. The SAM D21J family's functional-safety architecture supports fault detection on analog channels, while low-power Sleepwalking modes enable years of battery life on a single primary cell.
Recommended
Consumer Electronics
For consumer products such as remote controls, smart toys, and small appliances, the ATSAMD21J17D-CUT offers a compact 5x5 mm UFBGA footprint suitable for highly miniaturized boards. Its Cortex-M0+ core delivers responsive user-interface performance while PWM channels drive LEDs, buzzers, and motor drivers. The 128 KB Flash fits rich UI state machines plus BLE/Zigbee stacks when paired with companion radios.
Recommended
Human-Machine Interface (HMI) Control Panels
The ATSAMD21J17D-CUT's 52 GPIO, PWM channels, and 12-bit ADC support capacitive-touch front panels, multiple rotary encoders, and LED matrix backlights in HMI control panels. At 48 MHz, the Cortex-M0+ handles refresh of small character displays at 100 Hz without flicker, while the 16 KB SRAM buffers small framebuffers for segmented LCDs. Microchip's Atmel QTouch library integrates directly with the SAM D21 peripheral touch engine.
Recommended
Recommended Products Summary
Engineering reference data for ATSAMD21J17D-CUT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAMD21J17D-AUT | ATSAMD21J17A-MU | ATSAMD21J17A-CUT | ATSAMD21J17A-AUT | ATSAMD21J17A-AF |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-UFBGA (5x5) | 64-UFBGA (5x5) | 64-UFBGA (5x5) | 64-UFBGA (5x5) | 64-UFBGA (5x5) | 64-UFBGA (5x5) |
| Core | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ |
| CPU Speed | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Flash | 128 KB | 128 KB | 128 KB | 128 KB | 128 KB | 128 KB |
| SRAM | 16 KB | 16 KB | 16 KB | 16 KB | 16 KB | 16 KB |
| USB | Full-Speed USB | Full-Speed USB | Full-Speed USB | Full-Speed USB | Full-Speed USB | Full-Speed USB |
| Silicon Revision | D revision (FuSa) | D revision (FuSa) | A revision | A revision | A revision | A revision |
| Packaging Format | Tape & Reel (3 500) | Tape & Reel (6 000) | Tray | Tape & Reel (3 500) | Tape & Reel (6 000) | Tray |
Key Differentiators
- Full-Speed USB with internal pull-up (vs ATSAMD20J17A-MU (same package, no USB))
- Functional-safety D revision silicon (vs ATSAMD21J17A-CUT (same 128 KB Flash, A revision))
- Dual-bank Read-While-Write Flash (vs Single-bank flash competitors)
Design Notes
Decouple VDDIN with a 1 µF X7R ceramic plus a 100 nF NP0 placed within 5 mm of the package balls; per Microchip's SAM D21 datasheet the internal LDO requires this combination to keep core-rail ripple under 30 mVpp during sleepwalking transitions. VBAT should be tied to VDDIN when no RTC backup battery is used, or to a separate coin-cell through a 1 kΩ feed resistor to prevent reverse current into the main supply.
The 64-ball UFBGA at 0.5 mm pitch requires 0.4 mm laser-cut stencils with 1:1 aperture ratios to prevent solder bridging; Microchip's SAM D21 hardware-design guide recommends non-solder-mask-defined (NSMD) pads with 0.25 mm clearance to ground pours. Place the 12 MHz main crystal within 4 mm of XIN/XOUT, with a continuous ground ring underneath to suppress radiated harmonics into the USB and ADC channels.
Route USB D+ and D- as a 90 Ω differential pair with 4 mm to 6 mm maximum length matching; per USB 2.0 Full-Speed specification, intra-pair skew must not exceed 150 ps. Keep the differential pair clear of digital switching traces by at least 3 W (3 mm) and add a common-mode choke (such as a 90 Ω ferrite) at the connector side to suppress conducted EMI on the VBUS line.
Avoid leaving unused GPIO floating on the SAM D21; configure unused pins as inputs with the internal pull-up enabled, or as outputs driving low, to prevent spurious interrupts. The DAP (Debug Access Port) SWDIO and SWCLK pins must be accessible for in-circuit programming — do not strap them to peripheral functions in the I/O multiplexing without a recovery path. The 32.768 kHz crystal load capacitance must match the crystal's CL rating (typically 12.5 pF for SAM D21 reference designs).
Compliance Information
RoHS compliant per Microchip product page. Industrial temperature grade -40C to +85C. Not AEC-Q100 qualified; for automotive select SAM D20/D21 AEC-Q100 qualified variants.
