Microchip Technology ATSAMD21J
ATSAMD21J variants from Microchip Technology
ATSAMD21J Overview
What changes between part numbers, and what to check before you lock the BOM — Microcontrollers.
Key Features
- Footprint / package: https://www.microchipdirect.com/product/search/all/ATSAMD21J15, https://www.microchipdirect.com/product/search/all/ATSAMD21J16, https://www.microchipdirect.com/product/search/all/ATSAMD21J17, https://www.microchipdirect.com/product/search/all/ATSAMD21J18 (+2 more)Land pattern and thermal pad differ between these packages — run a quick footprint check before you swap variants.
- Lifecycle mix: ActiveConfirm lifecycle on the exact MPN, not just the base number prefix.
- 10 distinct suffix patternsExamples: 15, 16, 17, 18, 15B-AU (+5 more). Decode suffix meaning in the ordering notes under the variant table.
Target Applications
- Microcontrollers — design-in and field replacement
- BOM scrub where only the base prefix is known but suffix is TBD
- Second-source checks when the original MPN is constrained
Ordering Variants
Compare 10 ATSAMD21J part numbers by package, electrical parameters, lifecycle, and availability. Use RFQ for stock and lead-time confirmation.
| Part Number | Description | Package Type | Manufacturer | Lifecycle | RoHS | Availability | Action |
|---|---|---|---|---|---|---|---|
| ATSAMD21J15 | Package: https://www.microchipdirect.com/product/search/all/ATSAMD21J15 | Official Price: 1.8000 | Official Product URL: https://www.microchip.com/en-us/product/ATSAMD21J15 | https://www.microchipdirect.com/product/search/all/ATSAMD21J15 | Microchip Technology | Active | Compliant | In Stock | |
| ATSAMD21J16 | Package: https://www.microchipdirect.com/product/search/all/ATSAMD21J16 | Official Price: 1.8600 | Official Product URL: https://www.microchip.com/en-us/product/ATSAMD21J16 | https://www.microchipdirect.com/product/search/all/ATSAMD21J16 | Microchip Technology | Active | Compliant | In Stock | |
| ATSAMD21J17 | Package: https://www.microchipdirect.com/product/search/all/ATSAMD21J17 | Official Price: 2.0900 | Official Product URL: https://www.microchip.com/en-us/product/ATSAMD21J17 | https://www.microchipdirect.com/product/search/all/ATSAMD21J17 | Microchip Technology | Active | Compliant | In Stock | |
| ATSAMD21J18 | Package: https://www.microchipdirect.com/product/search/all/ATSAMD21J18 | Official Price: 2.7900 | Official Product URL: https://www.microchip.com/en-us/product/ATSAMD21J18 | https://www.microchipdirect.com/product/search/all/ATSAMD21J18 | Microchip Technology | Active | Compliant | In Stock | |
| ATSAMD21J15B-AU | IC MCU 32BIT 32KB FLASH 64TQFP | - | Microchip Technology | Active | Compliant | In Stock | |
| ATSAMD21J17A-AFT | Package: 64-TQFP | Mounting Type: Surface Mount | Operating Temperature: -40°C ~ 125°C (TA) | Supplier Device Package: 64-TQFP (10x10) | Peripherals: Brown-out Detect/Reset, DMA, I²S, POR, PWM, WDT | Number of I O: 52 | 64-TQFP | Microchip Technology | Active | Compliant | In Stock | |
| ATSAMD21J17D-AUT | IC MCU 32BIT 128KB FLASH 64TQFP | - | Microchip Technology | Active | Compliant | In Stock | |
| ATSAMD21J18A-CU | IC MCU 32BIT 256KB FLASH 64UFBGA | - | Microchip Technology | Active | Compliant | In Stock | |
| ATSAMD21J18A-MF | IC MCU 32BIT 256KB FLASH 64QFN | - | Microchip Technology | Active | Compliant | In Stock | |
| ATSAMD21J18A-MFT | Package: 64-VFQFN Exposed Pad | Mounting Type: Surface Mount | Operating Temperature: -40°C ~ 125°C (TA) | Supplier Device Package: 64-QFN (9x9) | Peripherals: Brown-out Detect/Reset, DMA, I²S, POR, PWM, WDT | Number of I O: 52 | 64-VFQFN Exposed Pad | Microchip Technology | Active | Compliant | In Stock |
Ordering Code Differences
How suffixes on ATSAMD21J map to package, grade, and reel options.
How to Choose the Right ATSAMD21J Microcontrollers
Match the footprint first
Packages here: https://www.microchipdirect.com/product/search/all/ATSAMD21J15, https://www.microchipdirect.com/product/search/all/ATSAMD21J16, https://www.microchipdirect.com/product/search/all/ATSAMD21J17, https://www.microchipdirect.com/product/search/all/ATSAMD21J18 (+2 more). Open the land-pattern drawing before you substitute a different suffix.
Electrical headroom
Compare voltage and current columns in the variant table. For ATSAMD21J, a suffix with lower voltage or current rating will not survive the same circuit without recalculation.
Temp grade letter matters
Commercial (0–70 °C) and industrial (−40–85 °C+) suffixes look similar in the prefix — confirm ambient + self-heating, not just the first page of the datasheet.
Copy the full MPN
Do not BOM only "ATSAMD21J" — include the full suffix (e.g. 15, 16, 17). RFQ with reel/tube preference and required date code.
Technical Specifications
Core parameters for ATSAMD21J product family
Identity
Variant Parameters
Source ATSAMD21J with Octatronics
Request stock confirmation, lead time, date code, and pricing for all 10 ordering variants from Microchip Technology. Our team supports active, EOL, and hard-to-find component sourcing.
- Original manufacturer parts with traceability options
- BOM upload and multi-line RFQ support
- Package, grade, and compliance verification
Frequently Asked Questions
Common technical questions about the ATSAMD21J product family.