AT45DQ321-SHD-T Equivalent & Substitute Parts

Part Overview

The AT45DQ321-SHD-T is a 32Mbit SPI FLASH memory IC manufactured by Renesas Electronics Corporation in an 8-SOIC package. This part operates at 104 MHz with a supply voltage range of 2.5V to 3.6V and is designed for non-volatile data storage applications requiring high-speed serial interface access. The product status is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives that maintain compatibility with existing designs while ensuring continued component availability.

Key Parameters

Parameter	Value
Memory Size	32Mbit
Memory Format	FLASH
Memory Interface	SPI
Clock Frequency	104 MHz
Memory Organization	528 Bytes x 8192 pages
Write Cycle Time (Word/Page)	8µs / 4ms
Voltage Supply Range	2.5V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package Type	8-SOIC (0.209", 5.30mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

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

Memory Capacity: 32Mbit (non-negotiable)
Memory Interface: SPI (non-negotiable)
Memory Organization: 528 Bytes x 8192 pages (non-negotiable)
Package Type: 8-SOIC with 5.30mm width (non-negotiable)
Write Cycle Time: 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:

Clock Frequency: May be equal to or greater than 104 MHz
Voltage Supply Range: May be equal to or encompass the original 2.5V ~ 3.6V range
Product Status: Active status preferred for long-term availability

Parameter Comparison

Parameter	AT45DQ321-SHD-T (Main)	AT45DB321E-SHF-T	AT45DB321E-SHFHA-T	AT45DQ321-SHF-T
Manufacturer	Renesas Electronics	Renesas Electronics	Renesas Electronics	Adesto Technologies
Memory Size	32Mbit	32Mbit	32Mbit	32Mbit
Memory Interface	SPI	SPI	SPI	SPI
Clock Frequency	104 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
Write Cycle Time (Word/Page)	8µs / 4ms	8µs / 4ms	8µs / 4ms	8µs / 4ms
Voltage Supply Range	2.5V ~ 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
Package Type	8-SOIC (0.209", 5.30mm)	8-SOIC (0.209", 5.30mm)	8-SOIC (0.209", 5.30mm)	8-SOIC (0.209", 5.30mm)
Product Status	Discontinued	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitute: AT45DQ321-SHF-T

The AT45DQ321-SHF-T manufactured by Adesto Technologies is the direct functional equivalent. It maintains the original 104 MHz clock frequency, identical memory organization, and all critical electrical parameters. The part is currently active with 3555 units in stock. Voltage supply range extends to 2.3V minimum, providing broader operational compatibility. ROHS3 compliance and MSL 1 rating are maintained.

Secondary Substitutes: AT45DB321E-SHF-T and AT45DB321E-SHFHA-T

Both AT45DB321E variants are manufactured by Renesas Electronics and maintain full compatibility with the original part specifications. The clock frequency is reduced to 85 MHz, which is acceptable for applications not requiring the full 104 MHz performance. Both parts are active with substantial inventory availability (14200 and 2504 units respectively). Voltage supply range extends to 2.3V minimum. ROHS3 compliance and MSL 1 rating are maintained. The AT45DB321E-SHF-T is supplied in Cut Tape and Digi-Reel packaging, while AT45DB321E-SHFHA-T is supplied in Tape & Reel format.

All three substitute parts satisfy the mandatory substitution criteria and are suitable for direct replacement in designs where the original AT45DQ321-SHD-T is specified.

Frequently Asked Questions (FAQ)

Q: Can AT45DB321E variants replace AT45DQ321-SHD-T in all applications?

A: Yes, provided the application does not require the full 104 MHz clock frequency. The AT45DB321E series operates at 85 MHz, which is sufficient for most SPI FLASH memory applications. All other critical parameters including memory capacity, organization, write cycle times, voltage range, temperature range, and package dimensions are identical.

Q: What is the difference between AT45DQ321-SHF-T and AT45DB321E-SHF-T?

A: The primary difference is clock frequency. AT45DQ321-SHF-T operates at 104 MHz while AT45DB321E-SHF-T operates at 85 MHz. Both maintain identical memory capacity, organization, and electrical characteristics. AT45DQ321-SHF-T is manufactured by Adesto Technologies while AT45DB321E-SHF-T is manufactured by Renesas Electronics.

Q: Are there packaging differences between the substitute parts?

A: All substitute parts use the same 8-SOIC package with 5.30mm width. Packaging format differences exist: AT45DB321E-SHF-T is available in Cut Tape and Digi-Reel, while AT45DB321E-SHFHA-T is supplied in Tape & Reel format. These are supplier packaging variations and do not affect component functionality or PCB compatibility.

Q: Does the extended voltage range (2.3V minimum) of substitute parts affect compatibility?

A: No. The extended voltage range of 2.3V to 3.6V in substitute parts is backward compatible with the original 2.5V to 3.6V specification. Designs operating within the original voltage range will function identically with substitute parts.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All three substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original AT45DQ321-SHD-T specifications.

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