AT45DB321D-SU Equivalent & Substitute Parts

Part Overview

The AT45DB321D-SU 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 substitute parts necessary for new designs and ongoing production requirements. Equivalent and higher-performance alternatives are available from the same manufacturer with enhanced specifications and active product status.

Key Parameters

Parameter	Value
Memory Size	32Mbit
Memory Format	FLASH
Memory Interface	SPI
Clock Frequency	66 MHz
Memory Organization	528 Bytes x 8192 pages
Voltage Supply Range	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SOIC (0.209", 5.30mm Width)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

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

Memory Size: 32Mbit (fixed requirement)
Memory Format: FLASH (fixed requirement)
Memory Interface: SPI (fixed requirement)
Memory Organization: 528 Bytes x 8192 pages (fixed requirement)
Package / Case: 8-SOIC (fixed requirement)
Operating Temperature Range: -40°C ~ 85°C (fixed requirement)

Substitute parts maintain identical memory capacity, organization, interface protocol, and physical packaging. Clock frequency and voltage supply specifications may vary within acceptable ranges for the product category. All substitute parts listed are manufactured by Renesas Electronics Corporation and share the same base product number series (AT45DB321 or AT45DQ321).

Parameter Comparison

Parameter	AT45DB321D-SU (Main)	AT45DB321E-SHF-T	AT45DB321E-SHF-B	AT45DB321E-SHFHA-T	AT45DQ321-SHF-B
Memory Size	32Mbit	32Mbit	32Mbit	32Mbit	32Mbit
Memory Format	FLASH	FLASH	FLASH	FLASH	FLASH
Memory Interface	SPI	SPI	SPI	SPI	SPI
Clock Frequency	66 MHz	85 MHz	85 MHz	85 MHz	104 MHz
Memory Organization	528 Bytes x 8192 pages	528 Bytes x 8192 pages	528 Bytes x 8192 pages	528 Bytes x 8192 pages	528 Bytes x 8192 pages
Voltage Supply Range	2.7V ~ 3.6V	2.3V ~ 3.6V	2.3V ~ 3.6V	2.3V ~ 3.6V	2.3V ~ 3.6V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All substitute parts maintain functional equivalence with the AT45DB321D-SU through identical memory capacity, organization, interface protocol, and packaging. Selection among substitutes should be based on the following factors:

Product Status: The AT45DB321E series (AT45DB321E-SHF-T, AT45DB321E-SHF-B, AT45DB321E-SHFHA-T) and AT45DQ321-SHF-B are all active products with ongoing manufacturer support, whereas the original AT45DB321D-SU is obsolete.

Compliance Certifications: All substitute parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Packaging Options: AT45DB321E-SHF-T is supplied in Cut Tape (CT) & Digi-Reel format; AT45DB321E-SHF-B is supplied in Tube; AT45DB321E-SHFHA-T is supplied in Tape & Reel (TR). Select based on procurement and assembly requirements.

Programmability Verification: AT45DB321E-SHF-T is DiGi-Electronics programmable verified. AT45DB321E-SHF-B is DiGi-Electronics programmable verified. AT45DB321E-SHFHA-T and AT45DQ321-SHF-B are not verified for programmability through DiGi-Electronics.

Performance Characteristics: AT45DQ321-SHF-B operates at 104 MHz, providing the highest clock frequency among substitutes. AT45DB321E variants operate at 85 MHz. All substitutes support expanded voltage supply range (2.3V ~ 3.6V) compared to the original part (2.7V ~ 3.6V).

Frequently Asked Questions (FAQ)

Q: Can AT45DB321E-SHF-T directly replace AT45DB321D-SU in existing designs?

A: Yes. Both parts share identical memory capacity (32Mbit), organization (528 Bytes x 8192 pages), SPI interface, 8-SOIC packaging, and operating temperature range (-40°C ~ 85°C). The substitute operates at 85 MHz versus 66 MHz and supports a wider voltage range (2.3V ~ 3.6V versus 2.7V ~ 3.6V), making it functionally compatible.

Q: What is the difference between AT45DB321E and AT45DQ321 variants?

A: Both maintain identical memory specifications and packaging. The primary difference is clock frequency: AT45DB321E operates at 85 MHz, while AT45DQ321 operates at 104 MHz. Selection depends on system timing requirements and performance specifications.

Q: Does packaging format affect electrical compatibility?

A: No. AT45DB321E-SHF-T (Cut Tape), AT45DB321E-SHF-B (Tube), and AT45DB321E-SHFHA-T (Tape & Reel) are electrically identical. Packaging format affects procurement, storage, and assembly processes only.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitutes are ROHS3 compliant and REACH unaffected, meeting current environmental regulations.

Q: What does "DiGi-Electronics Programmable Verified" mean?

A: This certification indicates the part has been verified for programmability through DiGi-Electronics' testing and validation processes. AT45DB321E-SHF-T and AT45DB321E-SHF-B carry this verification; AT45DB321E-SHFHA-T and AT45DQ321-SHF-B do not.

Q: Can I use AT45DQ321-SHF-B if my system only requires 66 MHz operation?

A: Yes. AT45DQ321-SHF-B operates at 104 MHz but is backward compatible with lower frequency requirements. The higher clock frequency does not prevent operation in systems designed for 66 MHz or 85 MHz.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message