AT45DQ321-SHF2B-T Equivalent & Substitute Parts

Part Overview

The AT45DQ321-SHF2B-T is a 32Mbit FLASH memory IC manufactured by Renesas Electronics Corporation, designed for SPI interface applications operating at 104 MHz. This non-volatile memory device is actively produced and widely used in embedded systems requiring high-speed serial data storage. Substitute parts are identified when equivalent electrical specifications, memory capacity, interface protocol, and physical packaging are maintained across the product line, ensuring functional interchangeability in target applications.

Substiute Parts

AT45DQ321-SHF2B-T

Renesas Electronics CorporationIn Stock: 3399AT45DQ321-SHF2B-T Datasheet

Current PartRFQ

AT45DB321E-SHF2B-T

Renesas Electronics CorporationIn Stock: 5628AT45DB321E-SHF2B-T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AT45DQ321-SHF2B-T are identified based on the following critical parameters that determine functional equivalence:

• Memory capacity: 32Mbit
• Memory format: FLASH technology
• Interface protocol: SPI
• Memory organization: 512 Bytes x 8192 pages
• Package type: 8-SOIC with 5.30mm width
• Supply voltage range: 2.3V ~ 3.6V
• Operating temperature range: -40°C ~ 85°C
• Write cycle timing: 8µs (word) / 4ms (page)
• Compliance: ROHS3 Compliant, REACH Unaffected

The AT45DB321E-SHF2B-T qualifies as a substitute part because it maintains all critical electrical and mechanical parameters. The primary difference is the clock frequency specification (85 MHz versus 104 MHz), which represents a reduced maximum operating speed. This frequency reduction does not affect functional compatibility in applications where the lower speed is acceptable.

Parameter Comparison

Engineering Selection Recommendations

Both the AT45DQ321-SHF2B-T and AT45DB321E-SHF2B-T are active products manufactured by Renesas Electronics Corporation with full ROHS3 compliance and REACH unaffected status. Selection between these parts depends on application-specific clock frequency requirements. The AT45DQ321-SHF2B-T operates at 104 MHz maximum frequency, while the AT45DB321E-SHF2B-T operates at 85 MHz maximum frequency. All other electrical characteristics, memory capacity, interface protocol, and physical packaging are identical. Both devices support the same supply voltage range (2.3V ~ 3.6V) and operating temperature range (-40°C ~ 85°C). Component selection should be based on the maximum SPI clock frequency required by the target application circuit.

Frequently Asked Questions (FAQ)

Q: Can AT45DB321E-SHF2B-T replace AT45DQ321-SHF2B-T in existing designs?

A: The AT45DB321E-SHF2B-T is functionally compatible with the AT45DQ321-SHF2B-T provided the application does not require SPI clock frequencies exceeding 85 MHz. All memory capacity, interface protocol, voltage specifications, temperature range, and physical package dimensions are identical. If the design operates the SPI bus at or below 85 MHz, substitution is valid.

Q: What is the primary difference between these two parts?

A: The primary difference is the maximum clock frequency specification. The AT45DQ321-SHF2B-T supports 104 MHz operation, while the AT45DB321E-SHF2B-T supports 85 MHz operation. Memory capacity, organization, write cycle timing, voltage range, temperature range, and package type are identical.

Q: Are the physical packages identical?

A: Yes. Both parts use the 8-SOIC package with 0.209" width and 5.30mm body width. Pin configuration and PCB footprint are identical, allowing direct substitution at the board level.

Q: Do both parts meet the same compliance standards?

A: Yes. Both AT45DQ321-SHF2B-T and AT45DB321E-SHF2B-T are ROHS3 compliant and REACH unaffected, meeting equivalent environmental and regulatory requirements.

Q: What is the memory organization for both parts?

A: Both parts organize the 32Mbit capacity as 512 Bytes x 8192 pages, providing identical memory addressing and access patterns.