Microchip Technology ATSAML21J
ATSAML21J variants from Microchip Technology
ATSAML21J Overview
What changes between part numbers, and what to check before you lock the BOM — Microcontrollers.
Key Features
- Lifecycle mix: ActiveConfirm lifecycle on the exact MPN, not just the base number prefix.
- 6 distinct suffix patternsExamples: 16B, 17B, 18B, 17B-AUT, 18B-ANT (+1 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 6 ATSAML21J part numbers by package, electrical parameters, lifecycle, and availability. Use RFQ for stock and lead-time confirmation.
| Part Number | Description | Manufacturer | Lifecycle | RoHS | Availability | Action |
|---|---|---|---|---|---|---|
| ATSAML21J16B | | Official Price: 3.2000 | Official Product URL: https://www.microchip.com/en-us/product/ATSAML21J16B | Microchip Technology | Active | Compliant | In Stock | |
| ATSAML21J17B | | Official Price: 3.4100 | Official Product URL: https://www.microchip.com/en-us/product/ATSAML21J17B | Microchip Technology | Active | Compliant | In Stock | |
| ATSAML21J18B | | Official Price: 4.7300 | Official Product URL: https://www.microchip.com/en-us/product/ATSAML21J18B | Microchip Technology | Active | Compliant | In Stock | |
| ATSAML21J17B-AUT | IC MCU 32BIT 128KB FLASH 64TQFP | Microchip Technology | Active | Compliant | In Stock | |
| ATSAML21J18B-ANT | IC MCU 32BIT 256KB FLASH 64TQFP | Microchip Technology | Active | Compliant | In Stock | |
| ATSAML21J18B-UUT | IC MCU 32BIT 256KB FLASH 64WLCSP | Microchip Technology | Active | Compliant | In Stock |
Ordering Code Differences
How suffixes on ATSAML21J map to package, grade, and reel options.
How to Choose the Right ATSAML21J Microcontrollers
Match the footprint first
Pull the exact package drawing for your MPN — base-number swaps fail most often at the footprint, not the schematic.
Electrical headroom
Compare voltage and current columns in the variant table. For ATSAML21J, 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 "ATSAML21J" — include the full suffix (e.g. 16B, 17B, 18B). RFQ with reel/tube preference and required date code.
Technical Specifications
Core parameters for ATSAML21J product family
Identity
Variant Parameters
Source ATSAML21J with Octatronics
Request stock confirmation, lead time, date code, and pricing for all 6 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 ATSAML21J product family.