AT45DQ321-MHD-T Equivalent & Substitute Parts

Part Overview

The AT45DQ321-MHD-T is a 32Mbit Serial Peripheral Interface (SPI) FLASH memory IC manufactured by Renesas Electronics Corporation in an 8-UDFN (5x6) surface mount package. This part is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design support and component procurement. The device operates at 104 MHz clock frequency with 2.5V to 3.6V supply voltage range and is rated for -40°C to 85°C operating temperature.

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-UDFN Exposed Pad (5x6)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

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

Memory capacity: 32Mbit
Memory interface: SPI
Memory organization: 528 Bytes x 8192 pages
Package type: 8-UDFN Exposed Pad (5x6)
Write cycle times: 8µs (word) and 4ms (page)
Operating temperature range: -40°C to 85°C
RoHS3 compliance

The substitute parts identified maintain these core electrical and mechanical specifications. Variations in clock frequency (85 MHz vs. 104 MHz) and supply voltage minimum threshold (2.3V vs. 2.5V) represent acceptable parameter ranges within the same product family. Packaging format differences (Tape & Reel vs. Tray) do not affect electrical compatibility.

Parameter Comparison

Parameter	AT45DQ321-MHD-T (Main)	AT45DB321E-MHF-T	AT45DB321E-MHF-Y	AT45DQ321-MHF-T
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-UDFN Exposed Pad (5x6)	8-UDFN Exposed Pad (5x6)	8-UDFN Exposed Pad (5x6)	8-UDFN Exposed Pad (5x6)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Discontinued	Active	Active	Active
Packaging Format	Bulk	Tape & Reel (TR)	Tray	Tape & Reel (TR)

Engineering Selection Recommendations

All three substitute parts are manufactured by Renesas Electronics Corporation and maintain ROHS3 compliance and REACH unaffected status, consistent with the original AT45DQ321-MHD-T specification.

AT45DQ321-MHF-T provides the closest electrical match, maintaining the 104 MHz clock frequency of the original part while expanding the supply voltage minimum to 2.3V. This part is in active production status with 6620 units in stock.

AT45DB321E-MHF-T and AT45DB321E-MHF-Y operate at 85 MHz clock frequency, representing a reduced performance specification. Both parts are in active production status with higher inventory availability (24100 and 5395 units respectively). The AT45DB321E-MHF-T is supplied in Tape & Reel format, while the AT45DB321E-MHF-Y is supplied in Tray format. Both feature improved moisture sensitivity level (MSL 1 vs. MSL 3).

Component selection should prioritize AT45DQ321-MHF-T for applications requiring 104 MHz performance. AT45DB321E variants are suitable for applications tolerating 85 MHz operation.

Frequently Asked Questions (FAQ)

Q: Can AT45DB321E-MHF-T or AT45DB321E-MHF-Y be used as direct replacements for AT45DQ321-MHD-T?

A: These parts are electrically compatible substitutes with identical memory capacity, organization, interface, and package type. The primary difference is reduced clock frequency (85 MHz vs. 104 MHz). Substitution is valid only if the application does not require 104 MHz performance.

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

A: AT45DQ321-MHF-T maintains 104 MHz clock frequency matching the original part. AT45DB321E variants operate at 85 MHz. Both families share identical memory capacity, organization, and package specifications.

Q: Does packaging format (Tape & Reel vs. Tray vs. Bulk) affect electrical performance?

A: No. Packaging format affects only procurement and handling logistics. Electrical and functional specifications remain identical across all packaging options.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All identified substitute parts maintain ROHS3 compliance and REACH unaffected status consistent with the original AT45DQ321-MHD-T.

Q: What is the significance of MSL rating differences?

A: AT45DQ321-MHD-T and AT45DQ321-MHF-T carry MSL 3 (168 hours). AT45DB321E variants carry MSL 1 (unlimited). MSL rating indicates moisture sensitivity during storage and handling. Lower MSL values provide greater tolerance to moisture exposure.

Q: Can I use AT45DQ321-MHF-T as a direct pin-for-pin replacement?

A: Yes. AT45DQ321-MHF-T maintains identical 8-UDFN (5x6) package configuration with exposed pad, ensuring mechanical and electrical compatibility.

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