AT45DB021D-SH-T Equivalent & Substitute Parts

Part Overview

The AT45DB021D-SH-T is a 2Mbit FLASH memory IC with SPI interface operating at 66 MHz, packaged in 8-SOIC form factor. This component is classified as obsolete, making substitute parts necessary for new designs and ongoing production requirements. The part maintains compatibility with active alternatives that share the same base product number (AT45DB021) and core electrical specifications.

Substiute Parts

AT45DB021D-SH-T

Microchip TechnologyIn Stock: 18852AT45DB021D-SH-T Datasheet

Current PartRFQ

AT45DB021E-SHN-T

Renesas Electronics CorporationIn Stock: 2436AT45DB021E-SHN-T Datasheet

MFR RecommendedRFQ

AT45DB021E-SSHN2B-T

Renesas Electronics CorporationIn Stock: 4217AT45DB021E-SSHN2B-T Datasheet

MFR RecommendedRFQ

AT45DB021E-SSHNHA-T

Renesas Electronics CorporationIn Stock: 1124AT45DB021E-SSHNHA-T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for AT45DB021D-SH-T is determined by the following criteria:

Core Compatibility Requirements:

• Memory Size: 2Mbit (fixed requirement)
• Memory Format: FLASH (fixed requirement)
• Memory Interface: SPI (fixed requirement)
• Memory Organization: 264 Bytes x 1024 pages (primary requirement)
• Operating Temperature Range: -40°C ~ 85°C (fixed requirement)
• Package Type: 8-SOIC (fixed requirement)
• RoHS Status: ROHS3 Compliant (fixed requirement)

Allowable Parameter Variations:

• Clock Frequency: Substitute parts operate at 70 MHz, which exceeds the original 66 MHz specification and maintains backward compatibility
• Voltage Supply Range: Substitute parts support 1.65V ~ 3.6V, which encompasses the original 2.7V ~ 3.6V range
• Product Status: Active alternatives replace the obsolete main part

The three substitute parts listed below meet all core compatibility requirements while offering improved or equivalent performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

AT45DB021E-SHN-T is the primary substitute for AT45DB021D-SH-T. This part maintains identical package dimensions (0.209", 5.30mm Width) and memory organization (264 Bytes x 1024 pages), ensuring direct compatibility with existing PCB layouts and firmware implementations. The part is active in production status and carries DiGi-Electronics Programmable verification, confirming functional compatibility. Improved specifications include 70 MHz clock frequency and extended voltage supply range (1.65V ~ 3.6V), with faster page write cycle time (3ms vs. 4ms).

AT45DB021E-SSHN2B-T and AT45DB021E-SSHNHA-T are alternative substitutes with different package dimensions (0.154", 3.90mm Width). These parts require PCB layout modification due to reduced package width. AT45DB021E-SSHN2B-T uses Cut Tape & Digi-Reel® packaging, while AT45DB021E-SSHNHA-T uses Tape & Reel packaging. Both maintain ROHS3 compliance and active product status. AT45DB021E-SSHNHA-T preserves the original memory organization (264 Bytes x 1024 pages), whereas AT45DB021E-SSHN2B-T uses 256 Bytes x 1024 pages organization.

Selection should prioritize AT45DB021E-SHN-T for drop-in replacement applications. Alternative parts are suitable only when PCB redesign is acceptable or when specific packaging requirements necessitate their use.

Frequently Asked Questions (FAQ)

Q: Can AT45DB021E-SHN-T replace AT45DB021D-SH-T without PCB modification?

A: Yes. AT45DB021E-SHN-T maintains identical package dimensions (8-SOIC, 0.209", 5.30mm Width) and pinout compatibility, enabling direct substitution without PCB layout changes.

Q: What is the difference between the three substitute parts?

A: The primary difference is package width. AT45DB021E-SHN-T uses 0.209" width (matching the original), while AT45DB021E-SSHN2B-T and AT45DB021E-SSHNHA-T use 0.154" width, requiring PCB redesign. Additionally, AT45DB021E-SSHN2B-T uses 256 Bytes x 1024 pages organization versus 264 Bytes x 1024 pages in the other parts.

Q: Are the substitute parts backward compatible with existing firmware?

A: AT45DB021E-SHN-T and AT45DB021E-SSHNHA-T maintain identical memory organization (264 Bytes x 1024 pages) and SPI interface, ensuring firmware compatibility. AT45DB021E-SSHN2B-T uses different memory organization (256 Bytes x 1024 pages) and requires firmware verification.

Q: What is the voltage supply compatibility?

A: AT45DB021D-SH-T operates at 2.7V ~ 3.6V. All substitute parts support 1.65V ~ 3.6V, which encompasses the original range. Designs operating within 2.7V ~ 3.6V experience no voltage-related compatibility issues.

Q: Do the substitute parts have faster performance?

A: Yes. Substitute parts operate at 70 MHz versus the original 66 MHz, and feature improved page write cycle time (3ms versus 4ms). These enhancements provide performance improvement without requiring design changes.

Q: What packaging options are available for the substitute parts?

A: AT45DB021E-SHN-T is supplied in Tape & Reel (TR) packaging. AT45DB021E-SSHN2B-T uses Cut Tape (CT) & Digi-Reel® packaging. AT45DB021E-SSHNHA-T uses Tape & Reel (TR) packaging. Selection depends on production volume and assembly requirements.

Q: Is DiGi-Electronics Programmable verification important for selection?

A: DiGi-Electronics Programmable verification confirms functional compatibility with programming equipment and procedures. AT45DB021E-SHN-T carries verified status. AT45DB021E-SSHN2B-T and AT45DB021E-SSHNHA-T are not verified; functional compatibility should be confirmed before production implementation.