AT45DB321D-SU-SL954 Equivalent & Substitute Parts

Part Overview

The AT45DB321D-SU-SL954 is a 32Mbit FLASH memory IC with SPI interface operating at 66 MHz, manufactured by Renesas Electronics Corporation in 8-SOIC surface mount packaging. This part is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts maintain the core 32Mbit capacity and SPI interface while offering enhanced performance specifications and active product status.

Substiute Parts

AT45DB321D-SU-SL954

Renesas Electronics CorporationIn Stock: 1083AT45DB321D-SU-SL954 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-SL954 is determined by the following mandatory 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 (fixed requirement)
• Operating Temperature Range: -40°C ~ 85°C (fixed requirement)

Substitute parts may exceed the original clock frequency specification (66 MHz) while maintaining backward compatibility. Enhanced voltage supply range compatibility (2.3V ~ 3.6V) is acceptable as it encompasses the original specification (2.7V ~ 3.6V). All substitute parts must be from Renesas Electronics Corporation and maintain identical pinout and mechanical dimensions.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts are manufactured by Renesas Electronics Corporation and maintain full compatibility with the AT45DB321D-SU-SL954 at the functional level. Selection among substitutes should be based on the following criteria:

AT45DB321E-SHF2B-T provides the minimum performance upgrade with 85 MHz clock frequency while maintaining the lowest cost differential. This part is ROHS3 compliant and REACH unaffected, suitable for applications requiring modest performance improvement over the original 66 MHz specification.

AT45DQ321-SHF2B-T and AT45DQ321-SHFHK-T both offer 104 MHz clock frequency, representing the highest performance tier. Both are ROHS3 compliant and REACH unaffected. The primary distinction between these two variants is packaging configuration (Tape & Reel versus alternative packaging), which affects supply chain and handling requirements rather than electrical performance.

All substitute parts feature active product status, ensuring long-term availability and supply chain stability compared to the obsolete original part.

Frequently Asked Questions (FAQ)

Q: Can AT45DB321E-SHF2B-T be used as a direct replacement for AT45DB321D-SU-SL954?

A: Yes. Both parts share identical memory capacity (32Mbit), interface (SPI), memory organization (512 Bytes x 8192 pages), package (8-SOIC), and operating temperature range (-40°C ~ 85°C). The AT45DB321E-SHF2B-T operates at 85 MHz versus 66 MHz, providing backward compatibility with designs specified for the original part.

Q: What is the difference between AT45DQ321-SHF2B-T and AT45DQ321-SHFHK-T?

A: Both parts are electrically identical with 104 MHz clock frequency and identical electrical specifications. The difference lies in packaging configuration: AT45DQ321-SHF2B-T is supplied in Tape & Reel format, while AT45DQ321-SHFHK-T uses alternative packaging. Selection depends on procurement and assembly requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. All three substitute parts (AT45DB321E-SHF2B-T, AT45DQ321-SHF2B-T, and AT45DQ321-SHFHK-T) are ROHS3 compliant and REACH unaffected.

Q: Does the lower voltage supply minimum (2.3V vs 2.7V) on substitute parts affect compatibility?

A: No. The substitute parts' voltage range (2.3V ~ 3.6V) encompasses the original specification (2.7V ~ 3.6V). Designs operating within the original 2.7V ~ 3.6V range remain fully compatible.

Q: Which substitute part should be selected for new designs?

A: Selection depends on performance requirements. For applications requiring only the original 66 MHz performance level, AT45DB321E-SHF2B-T provides cost-effective substitution. For applications benefiting from higher clock frequencies, AT45DQ321-SHF2B-T or AT45DQ321-SHFHK-T offer 104 MHz operation with identical pinout and package dimensions.