AT45DQ321-SHD-B Equivalent & Substitute Parts

Part Overview

The AT45DQ321-SHD-B is a 32Mbit FLASH memory IC with SPI interface manufactured by Renesas Electronics Corporation. This device is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives. The part operates at 104 MHz clock frequency with 8-SOIC surface mount packaging and supports supply voltages from 2.5V to 3.6V across the industrial temperature range of -40°C to 85°C.

Substiute Parts

AT45DQ321-SHD-B

Renesas Electronics CorporationIn Stock: 816AT45DQ321-SHD-B Datasheet

Current PartRFQ

AT45DB321E-SHF-B

Renesas Electronics CorporationIn Stock: 1349AT45DB321E-SHF-B Datasheet

MFR RecommendedRFQ

AT45DB321E-SHFHA-T

Renesas Electronics CorporationIn Stock: 2583AT45DB321E-SHFHA-T Datasheet

MFR RecommendedRFQ

AT45DQ321-SHF-B

Renesas Electronics CorporationIn Stock: 46262AT45DQ321-SHF-B Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AT45DQ321-SHD-B is determined by the following critical parameters: 32Mbit memory capacity, FLASH technology, SPI interface protocol, 528 Bytes x 8192 pages memory organization, 8-SOIC package geometry, surface mount mounting type, and industrial temperature range (-40°C to 85°C). The clock frequency and supply voltage range are secondary parameters that may vary within acceptable limits for system compatibility.

Three substitute parts meet these core requirements:

AT45DB321E-SHF-B: Maintains 32Mbit capacity, SPI interface, identical memory organization, and 8-SOIC packaging. Clock frequency reduced to 85 MHz; supply voltage range expanded to 2.3V ~ 3.6V. Product status is Active with verified programmability.

AT45DB321E-SHFHA-T: Identical electrical specifications to AT45DB321E-SHF-B with packaging format changed to Tape & Reel (TR). Supports higher volume procurement requirements.

AT45DQ321-SHF-B: Maintains original 104 MHz clock frequency and 2.3V ~ 3.6V supply voltage range. Identical memory capacity, organization, and 8-SOIC packaging. Product status is Active with higher inventory availability (46,204 pcs).

Parameter Comparison

Engineering Selection Recommendations

Primary Selection: AT45DQ321-SHF-B

This part maintains the original 104 MHz clock frequency specification of the discontinued AT45DQ321-SHD-B, ensuring direct functional equivalence. Product status is Active with substantial inventory availability (46,204 pcs). All compliance certifications match the original part: ROHS3 Compliant, REACH Unaffected, and MSL 1 rating. The only packaging difference is Tube format instead of the original SHD variant, which does not affect electrical or mechanical compatibility.

Secondary Selection: AT45DB321E-SHF-B

This part is suitable for applications where 85 MHz clock frequency meets system requirements. Product status is Active with verified programmability certification. Inventory availability is adequate (1,287 pcs). The expanded supply voltage range (2.3V ~ 3.6V) provides additional design flexibility. All compliance certifications are equivalent to the original part.

Tertiary Selection: AT45DB321E-SHFHA-T

This part provides identical electrical specifications to AT45DB321E-SHF-B with Tape & Reel packaging format. Selection is appropriate for high-volume manufacturing environments. Inventory availability is highest among all substitutes (2,504 pcs). Product status is Active with all required compliance certifications.

Frequently Asked Questions (FAQ)

Q: Can AT45DB321E-SHF-B replace AT45DQ321-SHD-B in all applications?

A: AT45DB321E-SHF-B is electrically compatible for applications where 85 MHz clock frequency is acceptable. The reduced clock frequency may impact system performance in timing-critical designs. Verify that your application does not require the original 104 MHz specification before substitution.

Q: What is the difference between Tube and Tape & Reel packaging?

A: Tube packaging (SHF-B) is suitable for lower-volume procurement and manual assembly. Tape & Reel packaging (SHFHA-T) is designed for automated pick-and-place assembly equipment and higher-volume production. Both formats contain identical components with identical electrical specifications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All three substitute parts carry ROHS3 Compliant certification, matching the original AT45DQ321-SHD-B. All parts are REACH Unaffected with MSL 1 moisture sensitivity rating.

Q: Does the expanded supply voltage range (2.3V ~ 3.6V) in AT45DB321E variants affect compatibility?

A: The expanded range is backward compatible. If your original design operated within 2.5V ~ 3.6V, the AT45DB321E variants will function identically. The lower minimum voltage (2.3V) provides additional design margin but does not require circuit modifications.

Q: What is the inventory status of each substitute part?

A: AT45DQ321-SHF-B has the highest availability with 46,204 pcs in stock. AT45DB321E-SHFHA-T has 2,504 pcs available. AT45DB321E-SHF-B has 1,287 pcs available. All parts are listed as Active products.