AT25DF321-SU Equivalent & Substitute Parts

Part Overview

The AT25DF321-SU is a 32Mbit Serial Peripheral Interface (SPI) FLASH memory IC manufactured by Renesas Electronics Corporation in an 8-SOIC surface mount package. This device operates at 70 MHz with a supply voltage range of 2.7V to 3.6V and supports operating temperatures from -40°C to 85°C. The part is classified as Obsolete, making identification of functionally compatible alternatives necessary for ongoing design support and production continuity.

Substiute Parts

AT25DF321-SU

Renesas Electronics CorporationIn Stock: 10276AT25DF321-SU Datasheet

Current PartRFQ

AT25DF321A-SH-B

Renesas Electronics CorporationIn Stock: 1759AT25DF321A-SH-B Datasheet

MFR RecommendedRFQ

AT25DF321A-SH-T

Renesas Electronics CorporationIn Stock: 20282AT25DF321A-SH-T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AT25DF321-SU is determined by the following critical parameters:

• Memory capacity: 32Mbit (non-negotiable)
• Memory interface: SPI protocol (non-negotiable)
• Package type: 8-SOIC form factor (non-negotiable)
• Supply voltage: 2.7V ~ 3.6V compatibility (non-negotiable)
• Operating temperature range: -40°C ~ 85°C (non-negotiable)

The identified substitute parts AT25DF321A-SH-B and AT25DF321A-SH-T meet all critical substitution criteria. Both are Renesas Electronics Corporation products with identical memory capacity, SPI interface, 8-SOIC packaging, voltage specifications, and temperature ratings. The primary differences are enhanced clock frequency (100 MHz versus 70 MHz) and improved write cycle performance, which represent forward compatibility advantages.

Parameter Comparison

Engineering Selection Recommendations

AT25DF321A-SH-B is the primary substitute for the AT25DF321-SU. This part carries Active product status from Renesas Electronics Corporation, ensuring long-term availability and manufacturing support. It holds ROHS3 compliance and REACH Unaffected certification, meeting current regulatory requirements for electronic components. The part is available in Tube packaging with verified programmability status.

AT25DF321A-SH-T is a secondary substitute option. While functionally equivalent to AT25DF321A-SH-B with identical electrical specifications, this part is listed as Discontinued at DiGi Electronics, indicating limited future availability. It is supplied in Cut Tape (CT) & Digi-Reel® packaging and also carries ROHS3 compliance and REACH Unaffected certification.

Both substitute parts provide enhanced performance characteristics compared to the obsolete AT25DF321-SU, including 100 MHz clock frequency operation and reduced page write cycle time (3ms versus 5ms), while maintaining full backward compatibility with the original part's core electrical and mechanical specifications.

Frequently Asked Questions (FAQ)

Q: Can AT25DF321A-SH-B directly replace AT25DF321-SU in existing designs?

A: Yes. Both parts share identical memory capacity (32Mbit), SPI interface protocol, 8-SOIC package dimensions, supply voltage range (2.7V ~ 3.6V), and operating temperature specifications (-40°C ~ 85°C). The substitute operates at higher clock frequency (100 MHz) and faster page write cycles (3ms), which are forward-compatible improvements.

Q: What is the difference between AT25DF321A-SH-B and AT25DF321A-SH-T?

A: Both parts are electrically and mechanically identical. The primary differences are packaging format (Tube versus Cut Tape & Digi-Reel®) and product availability status. AT25DF321A-SH-B maintains Active status, while AT25DF321A-SH-T is Discontinued at DiGi Electronics.

Q: Are there any compliance differences between the main part and substitutes?

A: The substitute parts AT25DF321A-SH-B and AT25DF321A-SH-T both carry ROHS3 compliance and REACH Unaffected certification. The original AT25DF321-SU does not specify these certifications in the provided data.

Q: Does the higher clock frequency of the substitutes affect circuit design?

A: No. The 100 MHz clock frequency of the substitute parts is a performance enhancement that does not require circuit modifications. Designs operating at the original 70 MHz specification will function correctly with the substitute parts.

Q: What packaging options are available for substitutes?

A: AT25DF321A-SH-B is supplied in Tube packaging. AT25DF321A-SH-T is supplied in Cut Tape (CT) & Digi-Reel® packaging. Both maintain the same 8-SOIC physical form factor.