AT45DB021D-SSH-B Equivalent & Substitute Parts

Part Overview

The AT45DB021D-SSH-B is a 2Mbit SPI FLASH memory IC manufactured by Microchip Technology, packaged in 8-SOIC form factor with 66 MHz clock frequency. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production support. The part operates across industrial temperature ranges (-40°C to 85°C) with supply voltage tolerance of 2.7V to 3.6V, serving applications requiring non-volatile serial memory storage.

Substiute Parts

AT45DB021D-SSH-B

Microchip TechnologyIn Stock: 7583AT45DB021D-SSH-B Datasheet

Current PartRFQ

AT45DB021E-SHN-T

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

MFR RecommendedRFQ

AT45DB021E-SHNHA-T

Renesas Electronics CorporationIn Stock: 1910AT45DB021E-SHNHA-T Datasheet

MFR RecommendedRFQ

AT45DB021E-SSHN-B

Renesas Electronics CorporationIn Stock: 1285AT45DB021E-SSHN-B 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

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:

Core Compatibility Criteria:

• Memory Size: 2Mbit (fixed requirement)
• Memory Format: FLASH (fixed requirement)
• Memory Interface: SPI (fixed requirement)
• Package Type: 8-SOIC (fixed requirement)
• Operating Temperature Range: -40°C ~ 85°C (fixed requirement)
• Voltage Supply Range: Must encompass or exceed 2.7V ~ 3.6V

Performance Parameters:

• Clock Frequency: Substitute parts operate at 70 MHz, exceeding the original 66 MHz specification
• Write Cycle Time: Substitute parts specify 3ms page write time, meeting or improving upon the original 4ms specification

All substitute parts listed are manufactured by Renesas Electronics Corporation (successor to Atmel/Microchip product lines) under the AT45DB021E series designation. These parts maintain identical memory capacity, organization, interface protocol, and thermal operating range while offering enhanced performance characteristics and active product status.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection Criteria:

AT45DB021E-SSHN-B is the recommended substitute for direct replacement applications. This part maintains the original 8-SOIC (0.154", 3.90mm) package footprint, ensuring PCB layout compatibility without redesign. The part carries active product status with verified DiGi-Electronics programmability certification, supporting long-term supply chain continuity.

Alternative Selections by Packaging Requirements:

For applications requiring Tape & Reel packaging, AT45DB021E-SSHNHA-T or AT45DB021E-SSHNHC-T provide equivalent functionality with identical physical package dimensions. Both parts maintain active status and ROHS3 compliance.

AT45DB021E-SHN-T and AT45DB021E-SHNHA-T utilize the larger 8-SOIC (0.209", 5.30mm) package variant. These parts are suitable only for new designs or applications where PCB layout accommodates the increased package width.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance, REACH unaffected status, and MSL 1 (unlimited) moisture sensitivity rating, matching the original part's environmental and regulatory certifications. All parts share identical ECCN (EAR99) and HTSUS (8542.32.0071) classifications.

Performance Enhancement:

Substitute parts operate at 70 MHz clock frequency versus the original 66 MHz specification, providing 6% performance headroom. Page write cycle time improves from 4ms to 3ms, reducing overall memory programming duration. Extended voltage supply range (1.65V ~ 3.6V) provides additional design flexibility while maintaining full compatibility with the original 2.7V ~ 3.6V operating window.

Frequently Asked Questions (FAQ)

Q: Can AT45DB021E series parts directly replace AT45DB021D-SSH-B without PCB modifications?

A: AT45DB021E-SSHN-B, AT45DB021E-SSHN2B-T, AT45DB021E-SSHNHA-T, and AT45DB021E-SSHNHC-T maintain the original 8-SOIC (0.154", 3.90mm) package footprint and pin configuration, enabling direct PCB replacement. AT45DB021E-SHN-T and AT45DB021E-SHNHA-T use a larger 8-SOIC (0.209", 5.30mm) package and require PCB layout verification before substitution.

Q: What is the significance of the memory organization difference between 264 Bytes and 256 Bytes per page?

A: AT45DB021E-SSHN2B-T specifies 256 Bytes x 1024 pages organization, while other substitute parts and the original maintain 264 Bytes x 1024 pages. This difference affects page addressing and data structure implementation. Applications utilizing the full 264-byte page structure should select parts explicitly rated for 264 Bytes x 1024 pages organization.

Q: Are all substitute parts suitable for industrial temperature applications?

A: All listed substitute parts operate across the -40°C to 85°C temperature range, matching the original part's industrial temperature specification. This ensures compatibility with applications requiring extended thermal operating windows.

Q: What packaging options are available for high-volume production?

A: AT45DB021E-SSHN2B-T offers Cut Tape (CT) & Digi-Reel® packaging suitable for automated assembly processes. AT45DB021E-SHN-T, AT45DB021E-SHNHA-T, AT45DB021E-SSHNHA-T, and AT45DB021E-SSHNHC-T provide Tape & Reel (TR) packaging for standard pick-and-place equipment. AT45DB021E-SSHN-B is available in Tube packaging for lower-volume applications.

Q: Does the 70 MHz clock frequency of substitute parts introduce compatibility concerns?

A: The 70 MHz specification represents maximum operating frequency. Substitute parts operate at or below the original 66 MHz specification without functional degradation. Existing firmware and timing-critical applications require no modification for clock frequency compatibility.

Q: What is the supply voltage compatibility between the original and substitute parts?

A: The original AT45DB021D-SSH-B operates at 2.7V ~ 3.6V. All substitute parts extend the lower voltage limit to 1.65V while maintaining the 3.6V upper limit. This extended range provides additional design flexibility while maintaining full compatibility with the original voltage specification window.