AT45DQ321-SHD2B-T Equivalent & Substitute Parts

Part Overview

The AT45DQ321-SHD2B-T is a 32Mbit FLASH memory IC manufactured by Renesas Electronics Corporation, designed for SPI interface applications operating at 104 MHz. This device is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives that maintain compatibility with existing circuit designs while meeting current supply chain requirements.

Substiute Parts

AT45DQ321-SHD2B-T

Renesas Electronics CorporationIn Stock: 1217AT45DQ321-SHD2B-T 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

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AT45DQ321-SHD2B-T is determined by the following critical parameters:

• Memory capacity: 32Mbit (non-negotiable)
• Memory interface: SPI protocol (non-negotiable)
• Memory organization: 512 Bytes x 8192 pages (non-negotiable)
• Package type: 8-SOIC form factor (non-negotiable)
• Write cycle timing: 8µs word / 4ms page (non-negotiable)
• Operating temperature range: -40°C ~ 85°C (non-negotiable)
• RoHS compliance: ROHS3 Compliant (required)

Acceptable variations within substitution criteria include clock frequency (provided minimum performance is maintained) and voltage supply range (provided the range encompasses the original specification). Packaging format (Cut Tape, Tape & Reel, or Digi-Reel) does not affect electrical compatibility.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts maintain full electrical and mechanical compatibility with the AT45DQ321-SHD2B-T within the specified parameters. Selection between substitutes should be based on the following factors:

AT45DB321E-SHF2B-T operates at 85 MHz clock frequency, which is lower than the original 104 MHz specification. This part is suitable for applications where maximum clock speed is not a design requirement. The voltage supply range extends to 2.3V, providing broader low-voltage compatibility. This part carries Active product status with established supply availability.

AT45DQ321-SHF2B-T maintains the original 104 MHz clock frequency specification, ensuring direct performance equivalence. The voltage supply range extends to 2.3V. This part carries Active product status and represents the closest functional match to the discontinued original part.

Both substitute parts are ROHS3 Compliant and maintain identical memory organization, write cycle timing, and operating temperature specifications. Packaging format differences (Cut Tape & Digi-Reel versus Tape & Reel) do not affect circuit-level compatibility.

Frequently Asked Questions (FAQ)

Q: Can AT45DB321E-SHF2B-T replace AT45DQ321-SHD2B-T in all applications?

A: AT45DB321E-SHF2B-T is electrically compatible with the original part for all memory operations, write timing, and thermal specifications. The 85 MHz clock frequency is lower than the original 104 MHz. Applications operating at or below 85 MHz will function without modification. Applications requiring 104 MHz operation must use AT45DQ321-SHF2B-T.

Q: What is the difference between the packaging formats listed?

A: Cut Tape (CT) & Digi-Reel, Tape & Reel (TR), and Digi-Reel are supply chain packaging formats that do not affect electrical performance or circuit compatibility. Selection depends on assembly process requirements and volume needs.

Q: Are the substitute parts pin-compatible with the original?

A: Yes. Both substitute parts use the 8-SOIC package with identical pinout and mechanical dimensions (0.209", 5.30mm Width). Direct PCB replacement is possible without layout modification.

Q: Do the substitute parts support the same voltage range?

A: The substitute parts support 2.3V ~ 3.6V, which encompasses the original specification of 2.5V ~ 3.6V. Applications designed for 2.5V ~ 3.6V operation are fully compatible with both substitutes.

Q: What is the significance of Active versus Discontinued product status?

A: Active status indicates current manufacturing and established supply chain availability. Discontinued status indicates the part is no longer produced. Active substitutes ensure long-term component availability for production and maintenance requirements.