AT45DB321D-SU-SL383 Equivalent & Substitute Parts

Part Overview

The AT45DB321D-SU-SL383 is a 32Mbit Serial Peripheral Interface (SPI) FLASH memory IC manufactured by Renesas Electronics Corporation in an 8-SOIC surface mount package. This device operates at 66 MHz and is designed for non-volatile data storage applications requiring SPI interface connectivity. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations.

Substiute Parts

AT45DB321D-SU-SL383

Renesas Electronics CorporationIn Stock: 2240AT45DB321D-SU-SL383 Datasheet

Current PartRFQ

AT45DB321E-SHF-T

Renesas Electronics CorporationIn Stock: 14289AT45DB321E-SHF-T Datasheet

MFR RecommendedRFQ

AT45DB321E-SHFHA-T

Renesas Electronics CorporationIn Stock: 2583AT45DB321E-SHFHA-T Datasheet

MFR RecommendedRFQ

AT45DQ321-SHF-T

Adesto TechnologiesIn Stock: 3643AT45DQ321-SHF-T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the AT45DB321D-SU-SL383 is determined by the following critical parameters that must remain compatible:

• Memory Size: 32Mbit (non-negotiable)
• Memory Format & Technology: FLASH (non-negotiable)
• Memory Interface: SPI (non-negotiable)
• Memory Organization: 528 Bytes x 8192 pages (non-negotiable)
• Package Type: 8-SOIC with 0.209" width, 5.30mm (non-negotiable)
• Mounting Type: Surface Mount (non-negotiable)
• Operating Temperature Range: -40°C ~ 85°C (non-negotiable)
• Voltage Supply Range: Minimum 2.3V ~ 3.6V acceptable (backward compatible with 2.7V ~ 3.6V requirement)

Clock frequency and write cycle time may vary upward without affecting compatibility, as faster operation is backward compatible with systems designed for lower speeds. The substitute parts identified maintain all critical parameters while offering enhanced performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: AT45DB321E-SHF-T

The AT45DB321E-SHF-T is the manufacturer-recommended substitute from Renesas Electronics Corporation. This part maintains identical memory specifications and package configuration while offering improved performance at 85 MHz. The device is classified as Active product status with ROHS3 compliance and verified DiGi-Electronics programmability, ensuring long-term availability and regulatory compliance for new designs and production support.

Secondary Recommendation: AT45DB321E-SHFHA-T

The AT45DB321E-SHFHA-T provides equivalent functionality to the primary recommendation with identical electrical and mechanical specifications. This variant is supplied in Tape & Reel packaging and maintains Active product status with ROHS3 compliance. Selection between AT45DB321E-SHF-T and AT45DB321E-SHFHA-T depends on packaging and quantity requirements.

Alternative Recommendation: AT45DQ321-SHF-T

The AT45DQ321-SHF-T, manufactured by Adesto Technologies, offers the highest clock frequency at 104 MHz while maintaining all critical compatibility parameters. This part is Active status with ROHS3 compliance. Selection of this alternative is appropriate when system design can benefit from enhanced performance specifications and cross-manufacturer sourcing is acceptable.

Frequently Asked Questions (FAQ)

Q: Can AT45DB321E-SHF-T directly replace AT45DB321D-SU-SL383 without circuit modifications?

A: Yes. Both parts maintain identical memory size (32Mbit), memory organization (528 Bytes x 8192 pages), SPI interface, package type (8-SOIC), and operating temperature range (-40°C ~ 85°C). The substitute operates at higher clock frequency (85 MHz vs. 66 MHz) and lower page write time (4ms vs. 6ms), which are backward compatible with systems designed for the original part.

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

A: The original AT45DB321D-SU-SL383 operates at 2.7V ~ 3.6V. All substitute parts operate at 2.3V ~ 3.6V, providing extended lower voltage capability. Systems designed for 2.7V ~ 3.6V operation are fully compatible with substitute parts.

Q: Are there differences in packaging between the three substitute options?

A: AT45DB321E-SHF-T is supplied in Cut Tape (CT) & Digi-Reel packaging. AT45DB321E-SHFHA-T is supplied in Tape & Reel (TR) packaging. AT45DQ321-SHF-T is supplied in Tape & Reel (TR) packaging. All three maintain identical 8-SOIC package dimensions (0.209", 5.30mm Width) and surface mount mounting type.

Q: What is the significance of the AT45DQ321-SHF-T operating at 104 MHz?

A: The higher clock frequency indicates faster data transfer capability. This part is backward compatible with systems designed for 66 MHz operation, as the SPI interface timing is determined by the host controller. The 104 MHz specification allows this part to support higher-speed applications without modification.

Q: Why is the original AT45DB321D-SU-SL383 classified as obsolete?

A: Obsolete classification indicates the manufacturer has discontinued production. The substitute parts listed are Active status alternatives that provide equivalent or enhanced functionality, ensuring continued availability for system support and new production requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. All three substitute parts are ROHS3 compliant. The original part's RoHS status was not specified in available documentation.