AT45DB321D-SU-SL955 Equivalent & Substitute Parts

Part Overview

The AT45DB321D-SU-SL955 is a 32Mbit Serial Peripheral Interface (SPI) FLASH memory IC manufactured by Renesas Electronics Corporation in an 8-SOIC surface mount package. This part operates at 66 MHz with a supply voltage range of 2.7V to 3.6V and is rated for operating temperatures from -40°C to 85°C. The device is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

Substiute Parts

AT45DB321D-SU-SL955

Renesas Electronics CorporationIn Stock: 1186AT45DB321D-SU-SL955 Datasheet

Current PartRFQ

AT45DB321E-SHF2B-T

Renesas Electronics CorporationIn Stock: 5628AT45DB321E-SHF2B-T Datasheet

MFR RecommendedRFQ

AT45DQ321-SHF2B-T

Renesas Electronics CorporationIn Stock: 3399AT45DQ321-SHF2B-T Datasheet

MFR RecommendedRFQ

AT45DQ321-SHFHK-T

Renesas Electronics CorporationIn Stock: 1099AT45DQ321-SHFHK-T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the AT45DB321D-SU-SL955 is determined by the following critical parameters:

• Memory Size: 32Mbit (fixed requirement)
• Memory Format: FLASH (fixed requirement)
• Memory Interface: SPI (fixed requirement)
• Memory Organization: 512 Bytes x 8192 pages (fixed requirement)
• Package / Case: 8-SOIC with 5.30mm width (fixed requirement)
• Operating Temperature Range: -40°C ~ 85°C (fixed requirement)
• Mounting Type: Surface Mount (fixed requirement)

Substitute parts must maintain identical memory capacity, organization, interface protocol, and physical package dimensions. Clock frequency and supply voltage ranges may vary within the constraints of the application, provided the substitute operates within the specified temperature range and maintains SPI interface compatibility.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts (AT45DB321E-SHF2B-T, AT45DQ321-SHF2B-T, and AT45DQ321-SHFHK-T) are active products manufactured by Renesas Electronics Corporation and maintain full compatibility with the AT45DB321D-SU-SL955 across all critical electrical and mechanical parameters. The substitute parts offer enhanced performance through higher clock frequencies (85 MHz and 104 MHz respectively) and extended supply voltage compatibility (2.3V minimum versus 2.7V for the original part).

All substitute parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. The AT45DB321E-SHF2B-T operates at 85 MHz and represents a direct performance upgrade with minimal specification changes. The AT45DQ321-SHF2B-T and AT45DQ321-SHFHK-T both operate at 104 MHz, providing the highest performance option within the substitute group.

Frequently Asked Questions (FAQ)

Q: Can AT45DB321E-SHF2B-T, AT45DQ321-SHF2B-T, or AT45DQ321-SHFHK-T be used as direct replacements for AT45DB321D-SU-SL955?

A: Yes. All three substitute parts maintain identical memory capacity (32Mbit), memory organization (512 Bytes x 8192 pages), SPI interface protocol, 8-SOIC package dimensions, and operating temperature range (-40°C to 85°C). Physical and electrical compatibility is confirmed across all critical parameters.

Q: What are the differences between the substitute parts?

A: The primary difference is clock frequency. AT45DB321E-SHF2B-T operates at 85 MHz, while AT45DQ321-SHF2B-T and AT45DQ321-SHFHK-T both operate at 104 MHz. All three parts support a lower minimum supply voltage (2.3V versus 2.7V for the original part). The AT45DQ321 variants represent the highest performance option.

Q: Are there packaging differences between the substitute parts?

A: All substitute parts use the same 8-SOIC (0.209", 5.30mm Width) package. Physical footprint and mounting requirements are identical to the original AT45DB321D-SU-SL955.

Q: Do the substitute parts meet current compliance standards?

A: Yes. All substitute parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic components.

Q: Why is the original AT45DB321D-SU-SL955 classified as obsolete?

A: The original part is obsolete due to product lifecycle management by Renesas Electronics Corporation. The active substitute parts provide equivalent or superior functionality and are recommended for all new designs and production applications.