AT45DB321D-MU-SL383 Equivalent & Substitute Parts

Part Overview

The AT45DB321D-MU-SL383 is a 32Mbit Serial Peripheral Interface (SPI) FLASH memory IC manufactured by Renesas Electronics Corporation, packaged in 8-VDFN (6x5) format. This device operates at 66 MHz and is designed for non-volatile data storage applications requiring SPI interface connectivity.

The AT45DB321D-MU-SL383 is classified as Obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this memory IC.

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 Type	8-VDFN Exposed Pad
Mounting Type	Surface Mount
Write Cycle Time (Page)	6ms

Substitute Part Grouping Explanation

Substitution eligibility for the AT45DB321D-MU-SL383 is determined by the following critical parameters:

Memory Size: 32Mbit (required match)
Memory Format: FLASH (required match)
Memory Interface: SPI (required match)
Memory Organization: 528 Bytes x 8192 pages (required match)
Operating Temperature Range: -40°C ~ 85°C (required match)
Mounting Type: Surface Mount (required match)
Voltage Supply Range: Must be compatible or broader than 2.7V ~ 3.6V

The substitute parts identified maintain identical memory capacity, organization, interface protocol, and thermal operating range. Variations in clock frequency, package dimensions, and write cycle time are permissible provided the substitute meets or exceeds the performance requirements of the original specification.

Parameter Comparison

Parameter	AT45DB321D-MU-SL383	AT45DB321E-MHF-T	AT45DB321E-MWHF-T	AT45DQ321-MWHF-T
Memory Size	32Mbit	32Mbit	32Mbit	32Mbit
Memory Format	FLASH	FLASH	FLASH	FLASH
Memory Interface	SPI	SPI	SPI	SPI
Memory Organization	528 Bytes x 8192 pages	528 Bytes x 8192 pages	528 Bytes x 8192 pages	528 Bytes x 8192 pages
Clock Frequency	66 MHz	85 MHz	85 MHz	104 MHz
Voltage Supply Range	2.7V ~ 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 / Case	8-VDFN Exposed Pad	8-UDFN Exposed Pad	8-VDFN Exposed Pad	8-VDFN Exposed Pad
Write Cycle Time (Page)	6ms	4ms	4ms	4ms
Product Status	Obsolete	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All three substitute parts (AT45DB321E-MHF-T, AT45DB321E-MWHF-T, and AT45DQ321-MWHF-T) are classified as Active products with current manufacturing status, ensuring long-term supply chain availability compared to the Obsolete AT45DB321D-MU-SL383.

All substitute parts are ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory requirements. The substitute parts feature improved moisture sensitivity levels (MSL 1, Unlimited) compared to the original part (MSL 3, 168 Hours), reducing handling and storage constraints.

The AT45DB321E-MWHF-T maintains the original 8-VDFN package format (6x8 dimensions) and is the recommended primary substitute for direct PCB layout compatibility. The AT45DB321E-MHF-T uses an 8-UDFN package (5x6 dimensions) and requires PCB footprint verification. The AT45DQ321-MWHF-T offers the highest clock frequency (104 MHz) while maintaining the 8-VDFN package format.

All substitute parts support the required voltage supply range and operating temperature specifications of the original design.

Frequently Asked Questions (FAQ)

Q: Can AT45DB321E-MHF-T be used as a direct replacement for AT45DB321D-MU-SL383?

A: AT45DB321E-MHF-T is functionally compatible regarding memory capacity, organization, interface, and thermal range. However, the package differs (8-UDFN 5x6 versus 8-VDFN 6x5), requiring PCB footprint verification before implementation.

Q: What is the primary advantage of AT45DB321E-MWHF-T over the original part?

A: AT45DB321E-MWHF-T maintains the original 8-VDFN package format, reducing PCB redesign requirements. It offers improved clock frequency (85 MHz versus 66 MHz), faster page write cycles (4ms versus 6ms), broader voltage supply compatibility (2.3V ~ 3.6V), and superior moisture sensitivity rating (MSL 1 versus MSL 3).

Q: Is AT45DQ321-MWHF-T compatible with designs specified for AT45DB321D-MU-SL383?

A: AT45DQ321-MWHF-T meets all critical substitution parameters: identical memory size, organization, interface, and thermal range. The 8-VDFN package format matches the original. The higher clock frequency (104 MHz) is backward compatible with designs requiring 66 MHz operation.

Q: What are the package dimension differences between substitute parts?

A: AT45DB321E-MHF-T uses 8-UDFN (5x6) format. AT45DB321E-MWHF-T and AT45DQ321-MWHF-T both use 8-VDFN format with 6x8 dimensions, compared to the original 6x5 dimensions. PCB footprint compatibility must be verified for each application.

Q: Are all substitute parts RoHS compliant?

A: All three substitute parts are ROHS3 Compliant and REACH Unaffected, meeting current environmental regulations. The original AT45DB321D-MU-SL383 RoHS status is not specified in available documentation.

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