AT25DF021-MHF-T Equivalent & Substitute Parts

Part Overview

The AT25DF021-MHF-T is a 2Mbit SPI FLASH memory IC manufactured by Microchip Technology, packaged in 8-UDFN (5x6) with exposed pad. This device operates at 50 MHz clock frequency and supports a supply voltage range of 2.3V to 3.6V. The part is currently obsolete, making equivalent substitutes necessary for ongoing design support and production continuity. Substitute parts must maintain compatibility across memory capacity, interface protocol, and operating parameters while accommodating packaging and performance variations.

Key Parameters

Parameter	Value
Memory Size	2Mbit
Memory Organization	256K x 8
Memory Interface	SPI
Clock Frequency	50 MHz
Voltage Supply Range	2.3V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package Type	8-UDFN / 8-WSON Exposed Pad
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility for the AT25DF021-MHF-T is determined by the following mandatory parameters:

Memory Capacity: 2Mbit (256K x 8 organization)
Interface Protocol: SPI
Supply Voltage Compatibility: Minimum 2.3V support required
Operating Temperature Range: -40°C to 85°C
Package Compatibility: 8-pin DFN/WSON with exposed pad
Compliance: ROHS3 and REACH requirements

The substitute parts listed below meet these core electrical and mechanical requirements. Variations in clock frequency, write cycle time, and specific package dimensions (5x6 vs 6x5) are acceptable within the SPI FLASH 2Mbit category, provided the device maintains backward compatibility with the primary interface and voltage specifications.

Parameter Comparison

Parameter	AT25DF021-MHF-T	SST25LF020A-33-4I-QAE	W25X20CLZPIG
Manufacturer	Microchip Technology	Microchip Technology	Winbond Electronics
Memory Size	2Mbit	2Mbit	2Mbit
Memory Organization	256K x 8	256K x 8	256K x 8
Memory Interface	SPI	SPI	SPI
Clock Frequency	50 MHz	33 MHz	104 MHz
Voltage Supply Range	2.3V ~ 3.6V	3V ~ 3.6V	2.3V ~ 3.6V
Operating Temperature	-40°C ~ 85°C (TC)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Package / Case	8-UDFN Exposed Pad (5x6)	8-WDFN Exposed Pad	8-WDFN Exposed Pad (6x5)
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

SST25LF020A-33-4I-QAE is suitable for applications where clock frequency reduction from 50 MHz to 33 MHz is acceptable. This part maintains Microchip Technology manufacturing continuity and is currently in active production status. Note that the minimum supply voltage is 3V, which excludes designs requiring operation below 3V. The 8-WSON package is mechanically compatible with standard 8-pin DFN footprints.

W25X20CLZPIG provides the highest clock frequency at 104 MHz and maintains the full 2.3V to 3.6V supply voltage range of the original part. This Winbond device is actively produced with substantial inventory availability. The 8-WSON (6x5) package dimensions differ slightly from the original 5x6 footprint but remain compatible with standard DFN land patterns. This part is recommended for designs requiring maximum performance headroom or lower voltage operation.

Both substitutes are ROHS3 compliant and carry identical MSL ratings, ensuring compatibility with standard PCB assembly processes.

Frequently Asked Questions (FAQ)

Q: Can SST25LF020A-33-4I-QAE operate at 2.3V like the original AT25DF021-MHF-T?

A: No. The SST25LF020A-33-4I-QAE minimum supply voltage is 3V. If your design requires operation below 3V, use W25X20CLZPIG instead.

Q: Are the package dimensions interchangeable between AT25DF021-MHF-T and the substitute parts?

A: The AT25DF021-MHF-T uses 8-UDFN (5x6), while both substitutes use 8-WSON packages. The pin pitch and footprint are compatible with standard 8-pin DFN land patterns. Verify PCB layout clearances for the specific package dimensions: SST25LF020A-33-4I-QAE uses standard 8-WSON, and W25X20CLZPIG uses 8-WSON (6x5).

Q: What is the impact of clock frequency differences on system design?

A: The original part operates at 50 MHz. SST25LF020A-33-4I-QAE operates at 33 MHz (lower performance), while W25X20CLZPIG operates at 104 MHz (higher performance). Both are SPI-compatible. Verify that your system controller can operate at the substitute device's clock frequency or configure the SPI interface accordingly.

Q: Are all three parts ROHS3 compliant?

A: Yes. AT25DF021-MHF-T, SST25LF020A-33-4I-QAE, and W25X20CLZPIG are all ROHS3 compliant with MSL rating 3 (168 Hours).

Q: Which substitute should I choose for a new design?

A: For new designs, select based on voltage requirements and performance needs. If 3V minimum supply is acceptable, SST25LF020A-33-4I-QAE provides Microchip continuity. If 2.3V operation is required or higher performance is needed, W25X20CLZPIG is the appropriate choice.

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