AT45DB321D-MU Equivalent & Substitute Parts

Part Overview

The AT45DB321D-MU is a 32Mbit SPI FLASH memory IC manufactured by Renesas Electronics Corporation, packaged in 8-VDFN (6x5) surface mount configuration. This part operates at 66 MHz clock frequency with a supply voltage range of 2.7V to 3.6V and is rated for -40°C to 85°C operating temperature. The AT45DB321D-MU is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

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 is determined by the following critical parameters:

Memory Size: 32Mbit (mandatory match)
Memory Format: FLASH (mandatory match)
Memory Interface: SPI (mandatory match)
Memory Organization: 528 Bytes x 8192 pages (mandatory match)
Operating Temperature Range: -40°C ~ 85°C (mandatory match)
Voltage Supply Range: Must be compatible or broader than 2.7V ~ 3.6V
Clock Frequency: May exceed 66 MHz (higher frequency is backward compatible)
Package Type: 8-VDFN or 8-UDFN configurations acceptable
Mounting Type: Surface Mount (mandatory match)

The substitute parts listed below meet all mandatory parameters while offering improved specifications in clock frequency and voltage supply range flexibility.

Parameter Comparison

Parameter	AT45DB321D-MU	AT45DB321E-MHF-T	AT45DB321E-MHF-Y	AT45DB321E-MWHF-Y	AT45DQ321-MWHF-Y
Memory Size	32Mbit	32Mbit	32Mbit	32Mbit	32Mbit
Memory Format	FLASH	FLASH	FLASH	FLASH	FLASH
Memory Interface	SPI	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	528 Bytes x 8192 pages
Clock Frequency	66 MHz	85 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	2.3V ~ 3.6V
Write Cycle Time (Page)	6ms	4ms	4ms	4ms	4ms
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package Type	8-VDFN (6x5)	8-UDFN (5x6)	8-UDFN (5x6)	8-VDFN (6x8)	8-VDFN (6x8)
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All substitute parts listed are active products manufactured by Renesas Electronics Corporation and are ROHS3 compliant with REACH unaffected status, providing regulatory compliance advantages over the obsolete AT45DB321D-MU.

AT45DB321E-MHF-T (Tape & Reel): Suitable for high-volume production environments. Offers 85 MHz clock frequency and improved moisture sensitivity rating (MSL 1). Package transition from 8-VDFN (6x5) to 8-UDFN (5x6) requires PCB layout verification.

AT45DB321E-MHF-Y (Tray): Functionally identical to AT45DB321E-MHF-T with identical electrical specifications. Tray packaging accommodates lower-volume or manual assembly processes. Same package footprint considerations apply.

AT45DB321E-MWHF-Y (Manufacturer Recommended): Maintains 8-VDFN package family with larger footprint (6x8). Eliminates package transition concerns for designs originally using 8-VDFN. Offers 85 MHz performance with improved moisture sensitivity.

AT45DQ321-MWHF-Y (Manufacturer Recommended): Highest performance option with 104 MHz clock frequency. Maintains 8-VDFN (6x8) package compatibility. Recommended for applications requiring maximum SPI throughput within the 32Mbit memory category.

Frequently Asked Questions (FAQ)

Q: Can AT45DB321E series parts directly replace AT45DB321D-MU without PCB modifications?

A: AT45DB321E-MWHF-Y maintains the 8-VDFN package family and is the preferred direct replacement. AT45DB321E-MHF-T and AT45DB321E-MHF-Y use 8-UDFN packaging with different footprint dimensions (5x6 vs 6x5), requiring PCB layout verification and potential rework.

Q: What is the significance of the voltage supply range expansion from 2.7V to 2.3V?

A: All substitute parts operate across 2.3V ~ 3.6V, providing broader low-voltage compatibility compared to the original 2.7V ~ 3.6V specification. This allows operation in systems with lower supply voltages while maintaining full backward compatibility with 2.7V minimum designs.

Q: Are the write cycle time improvements from 6ms to 4ms functionally significant?

A: Yes. The 33% reduction in page write cycle time (6ms to 4ms) improves overall system throughput for write-intensive applications. Designs relying on the original 6ms timing remain compatible, as faster write cycles do not create timing conflicts.

Q: Which substitute part is recommended for new designs?

A: AT45DQ321-MWHF-Y is the highest-performance active product with 104 MHz clock frequency and manufacturer recommendation status. For designs requiring package compatibility with existing AT45DB321D-MU layouts, AT45DB321E-MWHF-Y is the preferred alternative within the E-series.

Q: What are the packaging implications for production?

A: AT45DB321E-MHF-T (Tape & Reel) is optimized for automated assembly and high-volume production. AT45DB321E-MHF-Y and AT45DB321E-MWHF-Y (Tray) accommodate manual or lower-volume assembly processes. All three are active products with established supply chains.

Q: How does the moisture sensitivity level (MSL) change affect storage and handling?

A: The original AT45DB321D-MU has MSL 3 (168-hour floor life). All substitute parts have MSL 1 (unlimited floor life), eliminating moisture sensitivity constraints and reducing storage complexity for long-term inventory management.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message