AT25DF021-MH-Y Equivalent & Substitute Parts

Part Overview

The AT25DF021-MH-Y is a 2Mbit SPI FLASH memory IC manufactured by Microchip Technology, designed for non-volatile data storage applications requiring serial peripheral interface communication. This device operates at 70 MHz clock frequency with a supply voltage range of 2.7V to 3.6V and is housed in an 8-UDFN package with exposed pad. The product is currently classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations.

Substiute Parts

AT25DF021-MH-Y

Microchip TechnologyIn Stock: 889AT25DF021-MH-Y Datasheet

Current PartRFQ

W25X20CLZPIG

Winbond ElectronicsIn Stock: 29928W25X20CLZPIG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT25DF021-MH-Y is determined by strict alignment of the following electrical and mechanical parameters:

• Memory capacity: 2Mbit with 256K x 8 organization
• Interface protocol: SPI serial communication
• Supply voltage compatibility: Minimum 2.7V operation required
• Operating temperature range: -40°C to 85°C
• Package form factor: 8-pin surface mount with exposed pad
• Regulatory compliance: ROHS3 and REACH requirements

The W25X20CLZPIG from Winbond Electronics meets all substitution criteria. While this part operates at a higher clock frequency (104 MHz versus 70 MHz) and features a lower minimum supply voltage (2.3V versus 2.7V), these parameters represent functional enhancements that maintain backward compatibility with the original design specifications.

Parameter Comparison

Engineering Selection Recommendations

The W25X20CLZPIG is the qualified substitute for the AT25DF021-MH-Y based on the following factors:

• Both devices maintain identical memory capacity and organization (2Mbit, 256K x 8)
• SPI interface compatibility ensures protocol-level interchangeability
• Operating temperature range alignment (-40°C to 85°C) supports equivalent thermal performance
• ROHS3 compliance and identical MSL ratings (3, 168 Hours) satisfy regulatory and manufacturing requirements
• The W25X20CLZPIG is in active production status, providing long-term supply availability compared to the obsolete AT25DF021-MH-Y

Package footprint differences (8-UDFN 5x6 versus 8-WSON 6x5) require PCB layout verification to confirm mechanical compatibility in existing designs.

Frequently Asked Questions (FAQ)

Q: Can the W25X20CLZPIG directly replace the AT25DF021-MH-Y in existing designs?

A: Electrical substitution is valid based on matching memory capacity, SPI interface, voltage range, and temperature specifications. Physical PCB layout must be verified due to package footprint differences between 8-UDFN and 8-WSON packages.

Q: What is the significance of the higher clock frequency in the W25X20CLZPIG?

A: The 104 MHz clock frequency of the W25X20CLZPIG exceeds the 70 MHz specification of the AT25DF021-MH-Y. This represents enhanced performance capability and does not create compatibility issues when substituting into designs specified for the lower frequency part.

Q: Are there supply voltage compatibility concerns?

A: The W25X20CLZPIG operates across 2.3V to 3.6V, which encompasses the AT25DF021-MH-Y range of 2.7V to 3.6V. Systems designed for 2.7V minimum supply will operate within the W25X20CLZPIG specification without modification.

Q: How do the package types differ?

A: The AT25DF021-MH-Y uses an 8-UDFN package (5x6mm), while the W25X20CLZPIG uses an 8-WSON package (6x5mm). Both are 8-pin surface mount packages with exposed pads. PCB footprint and land pattern adjustments may be required for physical compatibility.

Q: Are both parts compliant with current regulatory standards?

A: Both the AT25DF021-MH-Y and W25X20CLZPIG are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component manufacturing and use.