AT45DB321D-MU-2.5 Equivalent & Substitute Parts

Part Overview

The AT45DB321D-MU-2.5 is a 32Mbit FLASH memory IC with SPI interface manufactured by Renesas Electronics Corporation. This device operates at 50 MHz and is housed in an 8-VDFN (6x5) package with exposed pad. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts maintain the same memory capacity, organization, and core functionality while offering improved specifications and active product status.

Substiute Parts

AT45DB321D-MU-2.5

Renesas Electronics CorporationIn Stock: 1054AT45DB321D-MU-2.5 Datasheet

Current PartRFQ

AT45DB321E-MHF-T

Renesas Electronics CorporationIn Stock: 24208AT45DB321E-MHF-T Datasheet

DirectRFQ

AT45DB321E-MHF-Y

Renesas Electronics CorporationIn Stock: 5482AT45DB321E-MHF-Y Datasheet

DirectRFQ

AT45DB321E-MWHF-T

Renesas Electronics CorporationIn Stock: 1594AT45DB321E-MWHF-T Datasheet

MFR RecommendedRFQ

AT45DQ321-MWHF-T

Renesas Electronics CorporationIn Stock: 3043AT45DQ321-MWHF-T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Core Compatibility Requirements:

• Memory Size: 32Mbit (fixed across all substitutes)
• Memory Organization: 528 Bytes x 8192 pages (fixed across all substitutes)
• Memory Interface: SPI (fixed across all substitutes)
• Operating Temperature Range: -40°C ~ 85°C (TC) (fixed across all substitutes)
• Mounting Type: Surface Mount (fixed across all substitutes)

Allowable Variations:

• Clock Frequency: May increase from 50 MHz (original) to 85 MHz or 104 MHz (substitutes) without functional impact
• Voltage Supply Range: May expand from 2.5V ~ 3.6V (original) to 2.3V ~ 3.6V (substitutes), providing broader compatibility
• Package Dimensions: Variations permitted between 8-VDFN (6x5), 8-VDFN (6x8), and 8-UDFN (5x6) formats, all with exposed pad
• Write Cycle Time: May decrease from 6ms (original) to 4ms (substitutes), representing performance improvement
• Product Status: Transition from Obsolete to Active status
• Packaging Format: Variations in tape & reel, tray, and cut tape configurations

All substitute parts maintain the same base product family (AT45DB321 series) and are manufactured by Renesas Electronics Corporation.

Parameter Comparison

Engineering Selection Recommendations

AT45DB321E-MHF-T (Tape & Reel, 8-UDFN 5x6)

• Active product status with ROHS3 compliance and unlimited MSL rating
• 85 MHz clock frequency with improved 4ms page write cycle time
• Expanded voltage supply range (2.3V ~ 3.6V) provides broader system compatibility
• Suitable for high-volume production with tape & reel packaging

AT45DB321E-MHF-Y (Tray, 8-UDFN 5x6)

• Active product status with ROHS3 compliance and unlimited MSL rating
• Identical electrical specifications to AT45DB321E-MHF-T
• Tray packaging format for alternative handling and storage requirements
• Smaller package footprint (5x6 vs. 6x5 original)

AT45DB321E-MWHF-T (Cut Tape & Digi-Reel, 8-VDFN 6x8)

• Manufacturer-recommended substitute with active product status
• ROHS3 compliant with unlimited MSL rating
• Maintains 8-VDFN package family with larger footprint (6x8)
• 85 MHz operation with improved write performance

AT45DQ321-MWHF-T (Tape & Reel, 8-VDFN 6x8)

• Manufacturer-recommended substitute with highest clock frequency (104 MHz)
• Active product status with ROHS3 compliance and unlimited MSL rating
• Largest package footprint (6x8) with improved thermal characteristics
• Optimal for applications requiring maximum SPI clock speed

All substitute parts maintain functional equivalence with the obsolete AT45DB321D-MU-2.5 while offering improved compliance certifications, extended product lifecycle, and enhanced performance specifications.

Frequently Asked Questions (FAQ)

Q: Can AT45DB321E-MHF-T replace AT45DB321D-MU-2.5 directly? A: Yes. Both devices share identical memory capacity (32Mbit), organization (528 Bytes x 8192 pages), SPI interface, and operating temperature range (-40°C ~ 85°C). The substitute offers higher clock frequency (85 MHz vs. 50 MHz) and improved write cycle time (4ms vs. 6ms), which are backward-compatible enhancements. Package dimensions differ (8-UDFN 5x6 vs. 8-VDFN 6x5), requiring PCB layout verification.

Q: What is the difference between AT45DB321E-MHF-T and AT45DB321E-MHF-Y? A: Both parts are electrically identical with 85 MHz operation and 32Mbit capacity. The primary difference is packaging format: AT45DB321E-MHF-T is supplied in Tape & Reel (TR) format, while AT45DB321E-MHF-Y is supplied in Tray format. Selection depends on production volume and handling requirements.

Q: Why does AT45DQ321-MWHF-T operate at 104 MHz instead of 85 MHz? A: AT45DQ321-MWHF-T is a higher-performance variant within the same 32Mbit family. The increased clock frequency (104 MHz) provides faster SPI communication while maintaining full backward compatibility with the original 50 MHz specification. Applications can operate at reduced clock speeds if needed.

Q: Are package dimension changes critical for PCB redesign? A: Package changes require PCB layout verification. AT45DB321E-MHF-T and AT45DB321E-MHF-Y use 8-UDFN (5x6), while AT45DB321E-MWHF-T and AT45DQ321-MWHF-T use 8-VDFN (6x8). The original AT45DB321D-MU-2.5 uses 8-VDFN (6x5). Footprint compatibility must be confirmed before implementation.

Q: What compliance advantages do substitute parts offer? A: All substitute parts are ROHS3 compliant with Moisture Sensitivity Level 1 (unlimited storage), compared to the original part's MSL 3 (168 hours). This provides improved handling flexibility and extended shelf life. REACH compliance is unaffected across all parts.

Q: Can I use AT45DB321E-MWHF-T in applications designed for AT45DB321D-MU-2.5? A: Yes. AT45DB321E-MWHF-T maintains the same 8-VDFN package family as the original (though with larger dimensions: 6x8 vs. 6x5). Electrical specifications are fully compatible. Verify PCB footprint clearance before implementation.

Q: Which substitute part should I select for new designs? A: For new designs, AT45DQ321-MWHF-T is recommended as the manufacturer-preferred option, offering the highest performance (104 MHz) with active product status and full compliance certifications. For cost-sensitive applications, AT45DB321E-MHF-T provides excellent value with 85 MHz operation and tape & reel availability.