ATSAMD21J18A-AUT - 48MHz Cortex-M0+ MCU 256KB Flash TQFP-64 | Microchip
MPN: AUT β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
Drop-in alternatives for AUT β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATSAMD21J15B-AUT
β Drop-Inπ Reference alternative (not in catalog)
ATSAMD21J16B-AUT
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATSAMD21J18A-AU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATSAMD21J18A-AFT
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
AUT Maximum Ratings & Electrical Characteristics
| Core Processor | ARM Cortex-M0+ (SAM D21J) |
| Core Size | 32-Bit |
| Maximum Clock Frequency | 48 MHz |
| FLASH Memory | 256KB (256K x 8) |
| Performance | 2.46 CoreMark/MHz (SAM D21 family max) |
| Qualification | Functional Safety (FuSa) |
| Package | 64-TQFP (10x10 mm) |
| Mounting Type | Surface Mount |
| Program Memory Type | FLASH |
AUT 64-tqfp (10x10 mm) Pin Configuration Guide
Complete pinout information for AUT (64-tqfp (10x10 mm) 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 AUT.
Refer to the datasheet for full pin configuration.
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
AUT is suitable for 6 applications: Automotive Body and Auxiliary Modules, Industrial Sensors and Actuators, IoT and Connected Edge Nodes, Consumer Appliance Control, Test and Measurement Accessories, Medical and Health Monitoring Devices.
Automotive Body and Auxiliary Modules
The -AUT suffix and Functional Safety (FuSa) qualification make the ATSAMD21J18A-AUT a natural fit for automotive body electronics such as seat controllers, lighting modules, window lifters and sensor hubs that see extended ambient temperatures. The 48 MHz Cortex-M0+ provides adequate headroom for CAN-adjacent preprocessing and I/O scanning, while the 256KB FLASH accommodates large state machines and diagnostic firmware with room for OTA-style updates. Because it is a low-power M0+ core rather than an M4, it draws less current during continuous operation, which matters in modules powered under key-off conditions. Place the MCU near the connector interface with proper transient suppression on all board-level I/O, and verify the exact -AUT temperature rating against the module's worst-case thermal environment before release.
Recommended
Industrial Sensors and Actuators
The ATSAMD21J18A-AUT's 64-pin TQFP offers a high GPIO count, letting one MCU service multiple analog sensors, digital encoders and actuator drivers in a compact industrial node. The 48 MHz Cortex-M0+ executes 2.46 CoreMark/MHz, sufficient for filtering, threshold logic and serial protocol handling without a heavier core. The 256KB FLASH leaves ample space for protocol stacks and parameter tables, and the extended temperature suffix suits control cabinets and outdoor equipment. In typical use, the MCU samples sensors via its ADC and drives outputs through PWM or GPIO while communicating over RS-485 or CAN via external transceivers. The trade-off versus a larger M4 device is lower DSP throughput, so heavy floating-point math should be avoided or moved to fixed-point routines.
Recommended
IoT and Connected Edge Nodes
For battery-powered and mains-independent IoT nodes, the ATSAMD21J18A-AUT combines an energy-efficient Cortex-M0+ core with 256KB of on-chip FLASH, enough for a full wireless stack plus application firmware. The 48 MHz core handles packet preparation, cryptography overhead (lightweight ciphers) and sensor fusion basics while spending most of its life in low-power sleep states. The SAM D21 family's low-power design heritage from Atmel | SMART targets exactly this class of always-on but duty-cycled devices. Use the 64-TQFP I/O abundance to connect multiple radios or sensor buses on one board. Consider a lower memory variant (J15B/J16) if FLASH requirements are small, cutting BOM cost without any layout change within the same die revision.
Recommended
Consumer Appliance Control
Appliance control boards - washers, cooktops, HVAC user interfaces - need dependable I/O scanning, display driving and simple closed-loop control, all within tight cost limits. The ATSAMD21J18A-AUT delivers a 32-bit core at 48 MHz with 2.46 CoreMark/MHz efficiency, replacing older 8-bit MCUs while keeping code portable via ARM CMSIS and the broad Cortex-M0+ ecosystem. The 256KB FLASH supports localized UI strings, multiple language packs and bootloaders. The 64-TQFP (10x10 mm) package provides enough pins for keypads, LED segments, relays and communication links simultaneously. Its robust temperature rating also suits enclosure interiors near heat-generating loads, though airflow or heatspreading should still be verified in the mechanical design.
Recommended
Test and Measurement Accessories
Benchtop accessories - data loggers, probe interface pods, calibration jigs - benefit from the ATSAMD21J18A-AUT's combination of a precise 48 MHz timing base, 256KB FLASH for calibration tables, and a 64-pin TQFP with enough I/O for relay banks, reference multiplexers and USB or UART links. The Cortex-M0+ deterministic execution supports time-stamped sampling loops, and the family's low-power modes extend battery life in portable instruments. Because the device carries functional-safety qualification and the -AUT temperature grade, it also works in environmental chambers and vehicle-borne test rigs where ordinary industrial parts would drift out of rating. Budget serial bandwidth carefully: at 48 MHz the M0+ core comfortably sustains UART and SPI streaming to a host, but high-rate analog capture should use external front ends.
Recommended
Medical and Health Monitoring Devices
Portable health monitors and clinical accessories require a low-power 32-bit controller with dependable memory and a mature ecosystem. The ATSAMD21J18A-AUT's Cortex-M0+ core at 48 MHz performs sensor polling, basic digital filtering and user-interface control while consuming minimal energy, extending battery runtime in wearable and bedside formats. The 256KB FLASH holds signal-processing routines plus logging buffers, and the 64-TQFP package exposes ample GPIO for display, touch keys and multiple sensor buses. The functional-safety (FuSa) listing supports quality-managed design processes, although regulatory medical validation must be performed by the device manufacturer. Note the extended automotive rating is more than sufficient for typical medical operating ranges, providing conservative thermal margin.
Recommended
Recommended Products Summary
Engineering reference data for AUT β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAMD21J15B-AUT | ATSAMD21J16B-AUT | ATSAMD21J18A-AU |
|---|---|---|---|---|
| Package | 64-TQFP (10x10 mm) | 64-TQFP (10x10 mm) - same | 64-TQFP (10x10 mm) - same | 64-TQFP (10x10 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | ARM Cortex-M0+ 32-bit | ARM Cortex-M0+ 32-bit | ARM Cortex-M0+ 32-bit | ARM Cortex-M0+ 32-bit |
| Max Clock Frequency | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| FLASH Memory | 256KB (256K x 8) | 32KB | 64KB | 256KB |
| Temperature Grade | -AUT (automotive extended) | -AUT (automotive extended) | -AUT (automotive extended) | -AU (industrial) |
| Qualification | Functional Safety (FuSa) | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
| Performance (CoreMark/MHz) | 2.46 (SAM D21 family max) | 2.46 (SAM D21 family max) | 2.46 (SAM D21 family max) | 2.46 (SAM D21 family max) |
Key Differentiators
- Largest FLASH density in the SAM D21J family (vs ATSAMD21J15B-AUT)
- Automotive temperature grade with functional-safety qualification (vs ATSAMD21J18A-AU)
- High I/O count versus smaller siblings (vs ATSAMD21G18A-AUT)
Design Notes
Ordering-code precision is the single largest failure mode with this family. The SAM D21 line ships as E/G/J pin counts, 15/16/17/18 memory densities, and A/B die revisions with -AU and -AUT temperature grades. The '18' code means 256KB FLASH; '15' means only 32KB. A J18A and J15B share a footprint but differ in die revision, so flash programming algorithms and errata may differ. Always specify the full MPN including -AUT on POs and verify die revision in the SAM D21 family datasheet before qualifying any substitute.
The 64-TQFP (10x10 mm) has a 0.5 mm lead pitch, so specify solder-mask-defined pads per the Microchip package outline and use a standard reflow profile; the thermal pad is not present on TQFP, so heat exits through the leads. Provide a solid ground plane under the part and place 100 nF decoupling capacitors at each supply pin pair as close as possible to the package, plus one bulk capacitor of [DATA_NEEDED: recommended bulk capacitance value]. Follow the SAM D21 family datasheet power-supply chapter for VDDIO/VDDCORE sequencing requirements.
Estimated: because the verified listings do not include supply voltage or current figures, obtain VDD range and active/sleep currents from the SAM D21 family datasheet before power-budget calculations. Do not assume the automotive -AUT grade permits the same maximum junction temperature as the industrial -AU part without checking the absolute maximum ratings table. For battery designs, use the device's sleep modes and external wake sources; keep crystal-less (internal oscillator) operation in mind to remove the 32.768 kHz and main crystal current from the sleep budget when precision timing is not required.
Compliance Information
The retrieved verified listings (DigiKey, Mouser) do not state RoHS/REACH/lead-free status for the -AUT part explicitly. The listing does state Functional Safety (FuSa) qualification. Obtain the compliance certificate from Microchip before release.
