Microchip Technology ATSAMD51J
ATSAMD51J variants from Microchip Technology
ATSAMD51J 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/ATSAMD51J18A, https://www.microchipdirect.com/product/search/all/ATSAMD51J19A, https://www.microchipdirect.com/product/search/all/ATSAMD51J20A, 64-TQFP (+1 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.
- 19 distinct suffix patternsExamples: 18A, 19A, 20A, 18A-AU-EFP, 18A-AUT (+14 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 19 ATSAMD51J 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 |
|---|---|---|---|---|---|---|---|
| ATSAMD51J18A | Package: https://www.microchipdirect.com/product/search/all/ATSAMD51J18A | Official Price: 3.6500 | Official Product URL: https://www.microchip.com/en-us/product/ATSAMD51J18A | https://www.microchipdirect.com/product/search/all/ATSAMD51J18A | Microchip Technology | Active | Compliant | In Stock | |
| ATSAMD51J19A | Package: https://www.microchipdirect.com/product/search/all/ATSAMD51J19A | Official Price: 4.0300 | Official Product URL: https://www.microchip.com/en-us/product/ATSAMD51J19A | https://www.microchipdirect.com/product/search/all/ATSAMD51J19A | Microchip Technology | Active | Compliant | In Stock | |
| ATSAMD51J20A | Package: https://www.microchipdirect.com/product/search/all/ATSAMD51J20A | Official Price: 4.8100 | Official Product URL: https://www.microchip.com/en-us/product/ATSAMD51J20A | https://www.microchipdirect.com/product/search/all/ATSAMD51J20A | Microchip Technology | Active | Compliant | In Stock | |
| ATSAMD51J18A-AU-EFP | IC MCU 32BIT 256KB FLASH 64TQFP | - | Microchip Technology | Active | Compliant | In Stock | |
| ATSAMD51J18A-AUT | IC MCU 32BIT 256KB FLASH 64TQFP | - | Microchip Technology | Active | Compliant | In Stock | |
| ATSAMD51J18A-MU | IC MCU 32BIT 256KB FLASH 64QFN | - | Microchip Technology | Active | Compliant | In Stock | |
| ATSAMD51J19A-AF | IC MCU 32BIT 512KB FLASH 64TQFP | - | Microchip Technology | Active | Compliant | In Stock | |
| ATSAMD51J19A-AFT | IC MCU 32BIT 512KB FLASH 64TQFP | - | Microchip Technology | Active | Compliant | In Stock | |
| ATSAMD51J19A-AU-EFP | Package: 64-TQFP | Mounting Type: Surface Mount | Operating Temperature: -40°C ~ 85°C (TA) | Supplier Device Package: 64-TQFP (10x10) | Peripherals: Brown-out Detect/Reset, DMA, I²S, POR, PWM, WDT | Number of I O: 51 | 64-TQFP | Microchip Technology | Active | Compliant | In Stock | |
| ATSAMD51J19A-AUT-EFP | IC MCU 32BIT 512KB FLASH 64TQFP | - | Microchip Technology | Active | Compliant | In Stock | |
| ATSAMD51J19A-MF | IC MCU 32BIT 512KB FLASH 64QFN | - | Microchip Technology | Active | Compliant | In Stock | |
| ATSAMD51J19A-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 | Number of I O: 51 | 64-VFQFN Exposed Pad | Microchip Technology | Active | Compliant | In Stock | |
| ATSAMD51J20A-AF | IC MCU 32BIT 1MB FLASH 64TQFP | - | Microchip Technology | Active | Compliant | In Stock | |
| ATSAMD51J20A-AUT-EFP | Package: 64-TQFP | Mounting Type: Surface Mount | Operating Temperature: -40°C ~ 85°C (TA) | Supplier Device Package: 64-TQFP (10x10) | Peripherals: Brown-out Detect/Reset, DMA, I²S, POR, PWM, WDT | Number of I O: 51 | 64-TQFP | Microchip Technology | Active | Compliant | In Stock | |
| ATSAMD51J20A-MFT | IC MCU 32BIT 1MB FLASH 64QFN | - | Microchip Technology | Active | Compliant | In Stock | |
| ATSAMD51J20A-MU-EFP | Package: 64-VFQFN Exposed Pad | Mounting Type: Surface Mount | Operating Temperature: -40°C ~ 85°C (TA) | Supplier Device Package: 64-VQFN (9x9) | Peripherals: Brown-out Detect/Reset, DMA, I²S, POR, PWM, WDT | Number of I O: 51 | 64-VFQFN Exposed Pad | Microchip Technology | Active | Compliant | In Stock | |
| ATSAMD51J20A-MUT | Package: 64-VFQFN Exposed Pad | Mounting Type: Surface Mount | Operating Temperature: -40°C ~ 85°C (TA) | Supplier Device Package: 64-VQFN (9x9) | Peripherals: Brown-out Detect/Reset, DMA, I²S, POR, PWM | Number of I O: 51 | 64-VFQFN Exposed Pad | Microchip Technology | Active | Compliant | In Stock | |
| ATSAMD51J20A-UNT | IC MCU 32BIT 1MB FLASH 64WLCSP | - | Microchip Technology | Active | Compliant | In Stock | |
| ATSAMD51J20A-UUT | IC MCU 32BIT 1MB FLASH 64WLCSP | - | Microchip Technology | Active | Compliant | In Stock |
Ordering Code Differences
How suffixes on ATSAMD51J map to package, grade, and reel options.
How to Choose the Right ATSAMD51J Microcontrollers
Match the footprint first
Packages here: https://www.microchipdirect.com/product/search/all/ATSAMD51J18A, https://www.microchipdirect.com/product/search/all/ATSAMD51J19A, https://www.microchipdirect.com/product/search/all/ATSAMD51J20A, 64-TQFP (+1 more). Open the land-pattern drawing before you substitute a different suffix.
Electrical headroom
Compare voltage and current columns in the variant table. For ATSAMD51J, 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 "ATSAMD51J" — include the full suffix (e.g. 18A, 19A, 20A). RFQ with reel/tube preference and required date code.
Technical Specifications
Core parameters for ATSAMD51J product family
Identity
Base Model
ATSAMD51J
Manufacturer
Microchip Technology
Listed Variants
19
Variant Parameters
Package Type
https://www.microchipdirect.com/product/search/all/ATSAMD51J18A, https://www.microchipdirect.com/product/search/all/ATSAMD51J19A, https://www.microchipdirect.com/product/search/all/ATSAMD51J20A, 64-TQFP, 64-VFQFN Exposed Pad
Lifecycle Status
Active
RoHS Status
Compliant
Source ATSAMD51J with Octatronics
Request stock confirmation, lead time, date code, and pricing for all 19 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 ATSAMD51J product family.
ATSAMD51J is a base / family code from Microchip Technology. You order a full MPN such as ATSAMD51J18A, ATSAMD51J19A, ATSAMD51J20A. The variant table lists 19 orderable lines with different suffixes.
Listed suffix fragments include: 18A, 19A, 20A, 18A-AU-EFP, 18A-AUT, 18A-MU. Typically they encode package (https://www.microchipdirect.com/product/search/all/ATSAMD51J18A, https://www.microchipdirect.com/product/search/all/ATSAMD51J19A, https://www.microchipdirect.com/product/search/all/ATSAMD51J20A, 64-TQFP (+1 more)), temperature grade, and tape/reel option. Always decode on the Microchip Technology datasheet ordering guide — do not guess from pattern alone.
On this page the varying fields are: Package Type. Filter the table by the parameter you care about before picking an MPN.
Only after footprint and thermal review. Packages listed here (https://www.microchipdirect.com/product/search/all/ATSAMD51J18A, https://www.microchipdirect.com/product/search/all/ATSAMD51J19A, https://www.microchipdirect.com/product/search/all/ATSAMD51J20A, 64-TQFP (+1 more)) use different land patterns and often different thermal resistance. Layout swaps need a new paste stencil at minimum, not just a BOM edit.
Lifecycle values in our listing: Active. Status is per MPN suffix — one variant can be Active while another is NRND. Check PCN for your exact suffix before multi-year commitments.
Full manufacturer MPN (not just ATSAMD51J), quantity, needed date code, reel vs tube, and any compliance docs (CoC, RoHS, conflict minerals). If you only know the base prefix, include a photo of the existing label or reel.
Use the datasheet link in the page header. Cross-check electrical curves (SOA, saturation voltage, etc.) against your operating point — the table summarizes order codes, not every graph in the PDF.