AT45DB321E-MHF2B-T Equivalent & Substitute Parts

Part Overview

The AT45DB321E-MHF2B-T is a 32Mbit FLASH memory IC manufactured by Renesas Electronics Corporation, designed for SPI interface applications operating at 85 MHz. This component is classified as non-volatile memory with surface mount packaging in an 8-UDFN (5x6) form factor. The part maintains active product status and is ROHS3 compliant, making it suitable for modern electronic applications requiring persistent data storage with serial peripheral interface connectivity.

Substitute parts are identified when equivalent electrical and mechanical parameters align with the original specification, ensuring functional compatibility within the same application context.

Substiute Parts

AT45DB321E-MHF2B-T

Renesas Electronics CorporationIn Stock: 811AT45DB321E-MHF2B-T Datasheet

Current PartRFQ

AT45DQ321-MHF2B-T

Renesas Electronics CorporationIn Stock: 6998AT45DQ321-MHF2B-T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AT45DB321E-MHF2B-T is determined by strict alignment of the following critical parameters:

Memory capacity must remain 32Mbit with identical FLASH technology and SPI interface protocol. The memory organization of 512 Bytes x 8192 pages is mandatory for command and data structure compatibility. Package and mounting specifications must match exactly: 8-UDFN Exposed Pad surface mount configuration ensures mechanical and thermal compatibility with existing PCB layouts.

Voltage supply range (2.3V ~ 3.6V) and operating temperature range (-40°C ~ 85°C) establish the environmental operating envelope. Write cycle times (8µs word, 4ms page) define performance characteristics that must be maintained or improved.

The AT45DQ321-MHF2B-T qualifies as a substitute based on these parameters. While clock frequency increases from 85 MHz to 104 MHz, this represents a performance enhancement that does not compromise backward compatibility. All other electrical and mechanical parameters remain equivalent.

Parameter Comparison

Engineering Selection Recommendations

Both the AT45DB321E-MHF2B-T and AT45DQ321-MHF2B-T maintain active product status with ROHS3 compliance and REACH unaffected classification. Selection between these parts depends on application-specific clock frequency requirements and inventory availability.

The AT45DB321E-MHF2B-T operates at 85 MHz and is suitable for applications where this clock frequency meets system timing specifications. The AT45DQ321-MHF2B-T provides 104 MHz operation, offering increased performance headroom for timing-critical applications. The higher clock frequency of the substitute part does not introduce incompatibility with systems designed for the original 85 MHz specification, as SPI protocol timing remains backward compatible at lower frequencies.

Moisture sensitivity level differs between parts: AT45DB321E-MHF2B-T specifies MSL 1 (Unlimited), while AT45DQ321-MHF2B-T specifies MSL 3 (168 Hours). This distinction affects storage and handling requirements but does not impact functional performance after assembly.

Frequently Asked Questions (FAQ)

Q: Can AT45DQ321-MHF2B-T replace AT45DB321E-MHF2B-T in existing designs?

A: Yes. The substitute part maintains identical memory capacity, organization, interface protocol, voltage supply range, operating temperature range, package configuration, and write cycle times. The increased clock frequency (104 MHz vs. 85 MHz) provides performance enhancement without compromising backward compatibility.

Q: Are there package or pinout differences between these parts?

A: No. Both parts use identical 8-UDFN Exposed Pad surface mount packaging with the same physical dimensions (5x6). Pinout and mechanical compatibility are fully maintained.

Q: What is the significance of the clock frequency difference?

A: The AT45DQ321-MHF2B-T operates at 104 MHz compared to the original 85 MHz. This higher frequency allows faster data transfer rates on the SPI bus. Systems designed for 85 MHz operation remain fully compatible, as the substitute part supports all lower clock frequencies through standard SPI protocol operation.

Q: How do moisture sensitivity levels affect part selection?

A: Moisture sensitivity level (MSL) determines storage and handling requirements prior to assembly. MSL 1 (Unlimited) allows indefinite storage without moisture control. MSL 3 (168 Hours) requires storage in controlled humidity environments and limits shelf life after packaging opening. Post-assembly performance is unaffected by MSL rating.

Q: Are both parts RoHS compliant?

A: Yes. Both AT45DB321E-MHF2B-T and AT45DQ321-MHF2B-T are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic components.