Microchip Technology ATUC256L
ATUC256L variants from Microchip Technology
ATUC256L Overview
What changes between part numbers, and what to check before you lock the BOM — Microcontrollers.
ATUC256L is a Microchip Technology order-code family — not a single orderable MPN. This page lists 6 variants that share the same core device but differ in suffix fields (package, grade, reel/tube, electrical bin, etc.). Pick the exact full part number; substituting within the family without checking the datasheet often causes assembly or spec mismatches.
| Official Price: 7.5500 | Official Product URL: https://www.microchip.com/en-us/product/ATUC256L3U Other listed variants describe: | Official Price: 7.0000 | Official Product URL: https://www.microchip.com/en-us/product/ATUC256L4U; 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, POR, PWM, WDT | Number of I O: 51.
Across listed variants, watch these parameters: packages: 64-TQFP, 48-TQFP.
Suffix examples in this family: 3U, 4U, 3U-AUT, 3U-Z3UR, 3U-Z3UT, 4U-AUT. The characters after the base number usually encode package, temperature, or performance grade — compare the variant table column-by-column rather than assuming pin-compatible drops-in.
Columns that actually vary on this page: Package Type. If two rows match on MPN prefix but differ there, they are not interchangeable for production.
Example MPNs: ATUC256L3U, ATUC256L4U, ATUC256L3U-AUT, ATUC256L3U-Z3UR, ATUC256L3U-Z3UT, ATUC256L4U-AUT.
Key Features
- Footprint / package: 64-TQFP, 48-TQFPLand 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.
- 6 distinct suffix patternsExamples: 3U, 4U, 3U-AUT, 3U-Z3UR, 3U-Z3UT (+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 ATUC256L 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 |
|---|---|---|---|---|---|---|---|
| ATUC256L3U | | Official Price: 7.5500 | Official Product URL: https://www.microchip.com/en-us/product/ATUC256L3U | - | Microchip Technology | Active | Compliant | In Stock | |
| ATUC256L4U | | Official Price: 7.0000 | Official Product URL: https://www.microchip.com/en-us/product/ATUC256L4U | - | Microchip Technology | Active | Compliant | In Stock | |
| ATUC256L3U-AUT | 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, POR, PWM, WDT | Number of I O: 51 | 64-TQFP | Microchip Technology | Active | Compliant | In Stock | |
| ATUC256L3U-Z3UR | IC MCU 32BIT 256KB FLASH 64QFN | - | Microchip Technology | Active | Compliant | In Stock | |
| ATUC256L3U-Z3UT | IC MCU 32BIT 256KB FLASH 64QFN | - | Microchip Technology | Active | Compliant | In Stock | |
| ATUC256L4U-AUT | Package: 48-TQFP | Mounting Type: Surface Mount | Operating Temperature: -40°C ~ 85°C (TA) | Supplier Device Package: 48-TQFP (7x7) | Peripherals: Brown-out Detect/Reset, DMA, POR, PWM, WDT | Number of I O: 36 | 48-TQFP | Microchip Technology | Active | Compliant | In Stock |
Ordering Code Differences
How suffixes on ATUC256L map to package, grade, and reel options.
ATUC256L uses a shared prefix; characters after the prefix encode orderable options. Two lines with the same prefix are not drop-in replacements unless the differing columns match your need.
Suffixes seen here: 3U, 4U, 3U-AUT, 3U-Z3UR, 3U-Z3UT, 4U-AUT.
What changes between rows: Package Type. Sort the table by these columns when narrowing from base number to a single MPN.
Full MPN examples: ATUC256L3U, ATUC256L4U, ATUC256L3U-AUT, ATUC256L3U-Z3UR, ATUC256L3U-Z3UT.
Tip: photograph or copy the reel label — reel diameter, QTY per reel, and moisture sensitivity level (MSL) are often suffix-driven and won't show in the schematic.
How to Choose the Right ATUC256L Microcontrollers
Match the footprint first
Packages here: 64-TQFP, 48-TQFP. Open the land-pattern drawing before you substitute a different suffix.
Electrical headroom
Compare voltage and current columns in the variant table. For ATUC256L, 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 "ATUC256L" — include the full suffix (e.g. 3U, 4U, 3U-AUT). RFQ with reel/tube preference and required date code.
Technical Specifications
Core parameters for ATUC256L product family
Identity
Variant Parameters
Source ATUC256L 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 ATUC256L product family.