AT25DF021-SSHF-T Equivalent & Substitute Parts

Part Overview

The AT25DF021-SSHF-T is a 2Mbit SPI FLASH memory IC manufactured by Microchip Technology, packaged in 8-SOIC form factor. This device operates at 50 MHz clock frequency with supply voltage range of 2.3V to 3.6V and is rated for -40°C to 85°C operating temperature. The product is currently obsolete, making equivalent substitute parts necessary for ongoing design support and production continuity.

Substiute Parts

AT25DF021-SSHF-T

Microchip TechnologyIn Stock: 1108AT25DF021-SSHF-T Datasheet

Current PartRFQ

LE25U20AMB-AH

onsemiIn Stock: 10365LE25U20AMB-AH Datasheet

MFR RecommendedRFQ

W25X20CLSNIG

Winbond ElectronicsIn Stock: 55503W25X20CLSNIG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AT25DF021-SSHF-T is determined by the following critical parameters:

• Memory capacity: 2Mbit (256K x 8 organization)
• Interface protocol: SPI
• Supply voltage compatibility: 2.3V ~ 3.6V
• Operating temperature range: -40°C ~ 85°C minimum
• Package mechanical compatibility: 8-SOIC form factor with 0.154" (3.90mm) width
• Regulatory compliance: ROHS3 Compliant

The two qualified substitute parts meet all mandatory electrical and mechanical requirements. Clock frequency variations are acceptable provided the substitute operates at or above the minimum 50 MHz requirement or is verified compatible with the application's actual clock speed.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts are ROHS3 compliant and maintain identical electrical specifications for memory capacity, organization, interface protocol, and supply voltage range. Both operate within the required -40°C to 85°C temperature range.

LE25U20AMB-AH (onsemi): Active product status with 10,300 units in stock. Clock frequency of 30 MHz is below the original 50 MHz specification. This substitute is suitable for applications where the actual SPI clock speed does not exceed 30 MHz.

W25X20CLSNIG (Winbond Electronics): Active product status with 55,400 units in stock. Clock frequency of 104 MHz exceeds the original 50 MHz specification. This substitute provides higher performance margin and is verified for DiGi-Electronics programmability. This part is suitable for all applications compatible with the AT25DF021-SSHF-T.

Frequently Asked Questions (FAQ)

Q: Can LE25U20AMB-AH replace AT25DF021-SSHF-T in all applications?

A: LE25U20AMB-AH is compatible only when the actual SPI clock frequency does not exceed 30 MHz. If your application requires 50 MHz operation, this substitute is not appropriate.

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

A: The primary difference is clock frequency. LE25U20AMB-AH operates at 30 MHz maximum, while W25X20CLSNIG operates at 104 MHz maximum. Both meet all other electrical and mechanical requirements.

Q: Are the package dimensions identical across all three parts?

A: Yes. All three parts use 8-SOIC packaging with 0.154" (3.90mm) width, ensuring mechanical compatibility for PCB layout and socket applications.

Q: Do both substitutes meet regulatory compliance requirements?

A: Yes. Both LE25U20AMB-AH and W25X20CLSNIG are ROHS3 compliant and REACH unaffected, matching the compliance profile of the AT25DF021-SSHF-T.

Q: Which substitute has better availability?

A: W25X20CLSNIG has 55,400 units in stock compared to LE25U20AMB-AH with 10,300 units, providing superior supply availability.