AT25DF021A-SSHN-B Equivalent & Substitute Parts

Part Overview

The AT25DF021A-SSHN-B is a 2Mbit Serial Peripheral Interface (SPI) FLASH memory IC manufactured by Renesas Electronics Corporation. This non-volatile memory device operates at 104 MHz with a supply voltage range of 1.65V to 3.6V and is housed in an 8-SOIC surface mount package. The part is currently in active production status and ROHS3 compliant. Substitute parts are identified when packaging format differs or when operational frequency specifications allow for functional equivalence within system requirements.

Key Parameters

Parameter	Value
Memory Size	2Mbit
Memory Organization	256K x 8
Memory Interface	SPI
Clock Frequency	104 MHz
Voltage Supply Range	1.65V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package Type	8-SOIC (0.154", 3.90mm Width)
Write Cycle Time - Word	8µs
Write Cycle Time - Page	2.5ms
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the AT25DF021A-SSHN-B are determined by equivalence in the following critical parameters: memory size (2Mbit), memory organization (256K x 8), interface type (SPI), supply voltage range (1.65V ~ 3.6V), operating temperature range (-40°C ~ 85°C), package type (8-SOIC), and RoHS compliance status (ROHS3).

The primary distinction between the main part and substitutes is packaging format. The AT25DF021A-SSHN-B is supplied in Tube packaging, while substitute parts AT25DF021A-SSHN-T and AT25XE021A-SSHN-T are supplied in Tape & Reel (TR) format. Both packaging formats are compatible for the same application when the receiving system accommodates the respective reel or tube configuration.

The AT25XE021A-SSHN-T operates at a reduced clock frequency of 70 MHz compared to the 104 MHz specification of the main part. This frequency reduction also results in an extended page write cycle time of 5ms versus 2.5ms. This part remains functionally equivalent for applications where the lower frequency specification is acceptable.

Parameter Comparison

Parameter	AT25DF021A-SSHN-B (Main)	AT25DF021A-SSHN-T (Substitute 1)	AT25XE021A-SSHN-T (Substitute 2)
Manufacturer	Renesas Electronics Corporation	Renesas Electronics Corporation	Renesas Electronics Corporation
Memory Size	2Mbit	2Mbit	2Mbit
Memory Organization	256K x 8	256K x 8	256K x 8
Memory Interface	SPI	SPI	SPI
Clock Frequency	104 MHz	104 MHz	70 MHz
Write Cycle Time - Word	8µs	8µs	8µs
Write Cycle Time - Page	2.5ms	2.5ms	5ms
Voltage Supply Range	1.65V ~ 3.6V	1.65V ~ 3.6V	1.65V ~ 3.6V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package Type	8-SOIC	8-SOIC	8-SOIC
Packaging Format	Tube	Tape & Reel (TR)	Tape & Reel (TR)
Moisture Sensitivity Level (MSL)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active

Engineering Selection Recommendations

AT25DF021A-SSHN-T is the direct functional equivalent of AT25DF021A-SSHN-B with identical electrical specifications and performance characteristics. The only difference is the packaging format (Tape & Reel versus Tube). This part is verified as programmable and carries MSL rating of 1 (Unlimited), indicating superior moisture protection compared to the main part. Selection of this substitute is appropriate when Tape & Reel packaging is compatible with assembly processes.

AT25XE021A-SSHN-T is functionally equivalent for applications where the reduced clock frequency of 70 MHz is acceptable. The extended page write cycle time of 5ms (versus 2.5ms) must be evaluated against system timing requirements. This part offers the highest inventory availability and carries MSL rating of 1 (Unlimited). Selection is appropriate only when system design does not require the 104 MHz operating frequency of the main part.

All three parts maintain ROHS3 compliance and active production status, ensuring long-term availability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can AT25DF021A-SSHN-T be used as a direct replacement for AT25DF021A-SSHN-B?

A: Yes. Both parts are electrically and functionally identical. The difference is packaging format: Tube versus Tape & Reel. Compatibility depends on whether your assembly process accommodates reel-based component feeding.

Q: What is the impact of using AT25XE021A-SSHN-T instead of AT25DF021A-SSHN-B?

A: The AT25XE021A-SSHN-T operates at 70 MHz instead of 104 MHz, and the page write cycle time extends from 2.5ms to 5ms. This part is suitable only if your system design does not require the higher frequency specification.

Q: Are all three parts ROHS3 compliant?

A: Yes. AT25DF021A-SSHN-B, AT25DF021A-SSHN-T, and AT25XE021A-SSHN-T are all ROHS3 compliant.

Q: What is the difference in Moisture Sensitivity Level (MSL) between the main part and substitutes?

A: AT25DF021A-SSHN-B has MSL 3 (168 Hours), while both AT25DF021A-SSHN-T and AT25XE021A-SSHN-T have MSL 1 (Unlimited). Lower MSL ratings indicate better moisture resistance and longer shelf life without desiccant storage.

Q: Are all parts in active production?

A: Yes. All three parts maintain active production status with Renesas Electronics Corporation.

Q: What is the memory organization for all parts?

A: All parts feature 256K x 8 memory organization with 2Mbit total capacity and SPI interface.

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