AT45DB021D-SSH-B Equivalent & Substitute Parts

Part Overview

The AT45DB021D-SSH-B is a 2Mbit SPI FLASH memory IC manufactured by Renesas Electronics Corporation in an 8-SOIC surface mount package. This device operates at 66 MHz with a supply voltage range of 2.7V to 3.6V and is rated for -40°C to 85°C operating temperature. The part is currently classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Substiute Parts

AT45DB021D-SSH-B

Renesas Electronics CorporationIn Stock: 7595AT45DB021D-SSH-B Datasheet

Current PartRFQ

AT45DB021E-SSHN-B

Renesas Electronics CorporationIn Stock: 1285AT45DB021E-SSHN-B Datasheet

MFR RecommendedRFQ

AT45DB021E-SSHNHA-T

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

MFR RecommendedRFQ

AT45DB021E-SSHNHC-T

Renesas Electronics CorporationIn Stock: 1256AT45DB021E-SSHNHC-T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the AT45DB021D-SSH-B is based on the following critical parameters that must remain compatible:

• Memory capacity: 2Mbit (non-negotiable)
• Memory interface: SPI (non-negotiable)
• Memory organization: 264 Bytes x 1024 pages (non-negotiable)
• Package type: 8-SOIC with identical physical dimensions (non-negotiable)
• Operating temperature range: -40°C ~ 85°C (non-negotiable)
• Moisture sensitivity level: 1 (Unlimited) (non-negotiable)

The substitute parts identified are all AT45DB021E variants manufactured by Renesas Electronics Corporation. These parts maintain identical memory capacity, organization, interface protocol, and physical packaging. The AT45DB021E series represents the active production equivalent to the obsolete AT45DB021D, with enhanced specifications including increased clock frequency (70 MHz vs. 66 MHz) and expanded supply voltage range (1.65V ~ 3.6V vs. 2.7V ~ 3.6V). These enhancements provide backward compatibility while offering improved performance margins.

Parameter Comparison

Engineering Selection Recommendations

All three AT45DB021E variants are suitable direct substitutes for the AT45DB021D-SSH-B based on electrical and mechanical compatibility. Selection among the three substitute options should be determined by packaging and procurement requirements:

AT45DB021E-SSHN-B is supplied in tube packaging and carries manufacturer verification status for DiGi-Electronics programmability. This variant is appropriate for applications requiring tube-packaged components.

AT45DB021E-SSHNHA-T and AT45DB021E-SSHNHC-T are supplied in Tape & Reel (TR) format, suitable for automated assembly processes. Both variants are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. The AT45DB021E-SSHNHA-T and AT45DB021E-SSHNHC-T variants provide identical electrical specifications and differ only in packaging configuration.

All substitute parts are active production components with current inventory availability, eliminating obsolescence risk associated with the original AT45DB021D-SSH-B.

Frequently Asked Questions (FAQ)

Q: Can AT45DB021E variants directly replace AT45DB021D-SSH-B in existing designs?

A: Yes. The AT45DB021E series maintains identical memory capacity (2Mbit), organization (264 Bytes x 1024 pages), SPI interface, 8-SOIC package dimensions, operating temperature range (-40°C ~ 85°C), and moisture sensitivity level. The enhanced clock frequency (70 MHz vs. 66 MHz) and expanded supply voltage range (1.65V ~ 3.6V vs. 2.7V ~ 3.6V) provide backward compatibility with improved performance margins.

Q: What is the difference between tube and Tape & Reel packaging options?

A: Tube packaging (AT45DB021E-SSHN-B) is suitable for manual assembly and lower-volume applications. Tape & Reel packaging (AT45DB021E-SSHNHA-T and AT45DB021E-SSHNHC-T) is designed for automated pick-and-place assembly processes and higher-volume production. Electrical specifications are identical across all packaging formats.

Q: Are the substitute parts compliant with current environmental regulations?

A: Yes. All AT45DB021E variants are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. The original AT45DB021D-SSH-B compliance status was not specified in available documentation.

Q: What is the significance of the expanded supply voltage range in AT45DB021E variants?

A: The AT45DB021E series operates from 1.65V to 3.6V, compared to 2.7V to 3.6V for the AT45DB021D-SSH-B. This expanded lower voltage limit provides greater design flexibility for low-power applications while maintaining full compatibility with standard 3.3V and 5V logic systems.

Q: How do write cycle times compare between the main part and substitutes?

A: The AT45DB021E variants feature a 3ms page write cycle time compared to 4ms for the AT45DB021D-SSH-B. This represents a performance improvement that does not affect compatibility or require design modifications.