ATSAML21J17B-MUT - 48MHz Cortex-M0+ 128KB MCU | Microchip
MPN: ATSAML21J17B-MUT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.28 | $4.28 |
| 10 | $3.95 | $39.50 |
| 100 | $3.62 | $362.00 |
| 500 | $3.21 | $1,605.00 |
| 1,000 | $2.85 | $2,850.00 |
| 3,000 | $2.49 | $7,470.00 |
ATSAML21J17B-MUT Overview
An ARM Cortex-M0+ microcontroller is a 32-bit RISC processor core based on the ARMv6-M architecture, designed for energy-efficient embedded applications. It belongs to the wider hierarchy microcontroller -> embedded MCU -> semiconductor IC, and uses the Thumb-2 instruction set to deliver high code density in compact firmware footprints. The SAM L21 family specifically targets ultra-low-power designs where Sleep-mode current dominates the energy budget of battery-powered sensor nodes.
Key features include 128 KB Flash, 16 KB SRAM, a 12-bit 1 Msps ADC, two analog comparators, a 32-bit RTC, SERCOM serial interfaces, and hardware crypto support via the on-chip PAC and TRNG peripherals. The device supports SleepWalking, idle, standby, backup, and off modes, allowing peripherals to operate independently while the CPU is asleep. Integrated op-amps and DAC channels support sensor-conditioning tasks without external components.
The SAM L21 family shares a linear address map, hex-compatible code, and pin-compatible migration paths across 32, 48, and 64-pin packages, simplifying firmware reuse between ATSAML21E/G/J variants. The Microchip SAM L21 datasheet documents the complete peripheral set and clock tree topology used in low-power IoT designs.
Typical applications include battery-powered IoT sensor nodes, wearable fitness bands, smart home edge devices, predictive-maintenance sensor hubs, and industrial metering. The 200 nA Sleep mode makes it ideal for energy-harvesting designs where average current draw must remain in the single-digit microamp range.
When designing with this device, prioritize Sleep mode selection and use the Event System to wake peripherals without CPU involvement. Carefully size decoupling capacitors near each VDD pin and follow the SAM L21 hardware design checklist for EMI and brown-out performance.
This page consolidates distributor pricing, drop-in alternative parts, and engineering design notes not found in the manufacturer datasheet, giving buyers and engineers a faster decision-making path.
Drop-in alternatives for ATSAML21J17B-MUT — 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 ATSAML21J17B-MUT (same form factor and footprint) — differing in Core, Flash Memory, Mounting Type, Operating Temperature, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAML21J18B-MUT
✅ Drop-In✓ In Stock
$4.68 / Unit
View Datasheet →ATSAML21J17B-MNT
✅ Drop-In✓ In Stock
$3.05 / Unit
View Datasheet →ATSAML21J16B-MUT
✅ Drop-In📋 Reference alternative (not in catalog)
ATSAML21J17B-MUT Maximum Ratings & Electrical Characteristics
| Core | ARM Cortex-M0+ (32-bit, ARMv6-M) |
| Maximum CPU Clock | 48 MHz |
| CoreMark Score | 2.46 CoreMark/MHz |
| Flash Memory | 128 KB |
| SRAM | 16 KB (128 KB variant per DigiKey/Mouser inconsistency noted) |
| Supply Voltage (VDD) | 1.62 V to 3.63 V |
| Active Current | < 35 uA/MHz |
| Sleep Current | 200 nA |
| Package | 64-pin QFN (9x9 mm) with exposed pad |
| ADC | 12-bit, up to 1 Msps |
| Analog Comparators | 2 |
| SERCOM Channels | 6 (configurable UART/SPI/I2C) |
| RTC | 32-bit RTC with calendar |
| Operating Temperature | -40C to +85C (industrial) |
| Mounting Type | Surface Mount (Tape & Reel) |
| RoHS Status | Compliant |
| Functional Safety | FuSa features integrated |
| Security | Peripheral Access Control (PAC), TRNG |
ATSAML21J17B-MUT 64-pin qfn (9x9 mm) with exposed pad Pin Configuration Guide
Pin configuration for ATSAML21J17B-MUT (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 ATSAML21J17B-MUT.
Refer to the datasheet for full pin configuration.
Typical Applications
ATSAML21J17B-MUT is suitable for 6 applications: Battery-Powered IoT Sensor Nodes, Wearable Fitness and Health Bands, Smart Home Edge Devices, Industrial Predictive-Maintenance Sensors, Smart Energy Meters and AMR Modules, Remote Controls and Human-Interface Devices.
Battery-Powered IoT Sensor Nodes
The ATSAML21J17B-MUT's 200 nA Sleep current and <35 uA/MHz active consumption per the SAM L21 datasheet make it ideal for battery-powered IoT sensor nodes that must operate for years on a single coin cell. SleepWalking peripherals allow ADC, I2C sensors, and comparators to wake the CPU only on relevant events, eliminating polling overhead. With 128 KB Flash and 16 KB SRAM, the MCU supports LoRaWAN, Sigfox, or BLE 5.0 stack integration alongside application firmware, while the 64-QFN package provides thermal-efficient mounting in compact sensor enclosures.
Recommended
Wearable Fitness and Health Bands
The SAM L21 family delivers the low-power profile required for wearable fitness bands where continuous heart-rate, accelerometer, and SpO2 monitoring must coexist with multi-day battery life. The ATSAML21J17B-MUT's 12-bit 1 Msps ADC samples biosensors at low duty cycles while Sleep mode holds the CPU at 200 nA between measurements. Integrated op-amps amplify PPG signals directly, eliminating external analog front-end ICs and reducing BOM cost. The 64-QFN package fits comfortably inside wristband form factors with limited PCB area.
Recommended
Smart Home Edge Devices
For smart home edge devices such as battery-powered door/window sensors, water-leak detectors, and remote controls, the ATSAML21J17B-MUT provides the ultra-low Sleep current essential for multi-year coin-cell operation. The Cortex-M0+ core's 48 MHz clock and 2.46 CoreMark/MHz efficiency handle Zigbee, Z-Wave, or Matter protocol stacks with headroom. Six SERCOM channels allow simultaneous I2C sensor, SPI display, and UART debug interfaces without CPU overhead. Functional Safety (FuSa) features add diagnostic coverage for safety-related home automation functions.
Recommended
Industrial Predictive-Maintenance Sensors
The ATSAML21J17B-MUT suits industrial predictive-maintenance sensors that monitor vibration, temperature, and acoustic emissions on rotating machinery. Its 200 nA Sleep current allows sensors to wake only when anomalies are detected, while the integrated 12-bit ADC and analog comparators handle vibration signal sampling directly. The wide 1.62V-3.63V supply range tolerates industrial 24V bus variations when paired with an external regulator. Functional Safety features support IEC 61508 SIL-2 capable designs for safety-critical plant monitoring.
Recommended
Smart Energy Meters and AMR Modules
The ATSAML21J17B-MUT's combination of Cortex-M0+ processing, low-power operation, and SERCOM channels makes it ideal for smart energy metering and automatic meter reading (AMR) modules. The 32-bit RTC tracks consumption intervals in 200 nA Sleep, while the 12-bit ADC accurately samples current-sense signals. The wide operating voltage range supports direct connection to metering bus voltages through external LDO regulators. Hardware TRNG and PAC features provide cryptographic primitives for secure AMI communications.
Recommended
Remote Controls and Human-Interface Devices
For BLE or IR remote controls, the ATSAML21J17B-MUT delivers the ultra-low Sleep current essential for years of battery life on coin cells. Six SERCOM channels support IR transmit, capacitive touch sensing, and wireless UART bridging. The Cortex-M0+ core runs haptic feedback algorithms and button-debounce logic efficiently at 48 MHz. The 64-QFN package with exposed thermal pad dissipates heat during active BLE transmission bursts while maintaining compact PCB layout for handheld form factors.
Recommended
Recommended Products Summary
Engineering reference data for ATSAML21J17B-MUT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAML21J18B-MUT | ATSAML21J17B-MNT | ATSAML21J16B-MUT |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-QFN (9x9 mm) | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same |
| Flash | 128 KB | 256 KB | 128 KB | 64 KB |
| SRAM | 16 KB | 32 KB | 16 KB | 8 KB |
| Maximum Clock | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Sleep Current | 200 nA | 200 nA | 200 nA | 200 nA |
| Operating Temperature | -40C to +85C (industrial) | -40C to +85C | -40C to +125C (automotive) | -40C to +85C |
| AEC-Q100 Qualified | No | No | Yes | No |
| Functional Safety (FuSa) | Yes | Yes | Yes | Yes |
Key Differentiators
- Ultra-low Sleep current of 200 nA - best-in-class for Cortex-M0+ (vs ATSAMD21G15B-MF)
- Functional Safety (FuSa) features integrated for safety-critical designs (vs ATSAMD20J17A-MNT)
- SleepWalking peripherals allow autonomous sensor operation (vs STM32L073V8T6 (cross-brand equivalent))
Design Notes
Estimated: At 48 MHz active mode and 35 uA/MHz, the ATSAML21J17B-MUT draws approximately 1.68 mA from VDD. In Sleep mode with RTC running, current drops to 200 nA per the SAM L21 datasheet. To minimize Sleep current, ensure unused GPIO pins are configured as inputs with pull-up enabled and unused peripherals are clock-gated via the Power Manager. Use SleepWalking for sensor polling to keep the CPU in Sleep while ADC/I2C operate autonomously, extending coin-cell battery life to multiple years.
The 64-QFN package has an exposed thermal pad that must be soldered to a ground pad with at least 8 thermal vias to the inner ground plane for proper heat dissipation. Place 100 nF decoupling capacitors within 2 mm of each VDD pin, and add a 4.7 uF bulk capacitor near the package. Keep the analog AVDD trace separated from digital VDD with a ferrite bead or pi-filter to prevent digital switching noise from coupling into ADC measurements, especially critical for the 12-bit 1 Msps ADC accuracy.
Do not exceed the 3.63V absolute maximum VDD rating - exceeding this during battery hot-swap or hot-plug events can permanently damage the MCU. Ensure the RESET pin has a 10 kOhm pull-up and 1 nF capacitor for proper power-on reset timing. When using the 32.768 kHz crystal for the RTC, place it within 5 mm of the XIN32/XOUT32 pins with a grounded guard ring to minimize clock drift. Avoid routing high-frequency signals (SERCOM SPI) directly over the crystal traces.
Route the SERCOM signals (I2C, SPI, UART) with matched trace lengths within 25 mm to maintain signal integrity at 48 MHz. Use a 4-layer PCB stack-up with dedicated ground and power planes for best EMI performance. Keep the SWD debug traces (SWDIO, SWCLK, NRST) short and isolated from switching signals to prevent debug failures in production. The 64-QFN land pattern must follow the IPC-7351 nominal density standard for reliable solder joint formation.
Compliance Information
RoHS and REACH compliant per Microchip product page. Industrial temperature grade (-40C to +85C). For AEC-Q100 automotive qualification, use ATSAML21J17B-MNT variant. Halogen-free status not explicitly stated in verified data.
