AT25DF021-SSHF-B Equivalent & Substitute Parts

Part Overview

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

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 / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

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

Core Compatibility Requirements:

Memory Size: 2Mbit (256K x 8 organization)
Memory Interface: SPI
Package / Case: 8-SOIC form factor
Mounting Type: Surface Mount
Operating Temperature Range: -40°C ~ 85°C minimum

Flexible Parameters (allowing substitution):

Clock Frequency: Substitute parts may operate at higher frequencies (70 MHz, 104 MHz) or lower frequencies (30 MHz) while maintaining backward compatibility
Voltage Supply Range: Substitute parts may have wider voltage ranges (1.65V ~ 3.6V) while encompassing the original 2.3V ~ 3.6V specification
Packaging Format: Tube, Tape & Reel, or unspecified packaging are interchangeable for component selection purposes
Product Status: Active parts are preferred over obsolete parts for new designs

The substitute parts listed below meet all core compatibility requirements and are electrically and mechanically interchangeable with the AT25DF021-SSHF-B.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Voltage Supply	Package	Product Status	Inventory
AT25DF021-SSHF-B	Renesas Electronics	2Mbit	50 MHz	2.3V ~ 3.6V	8-SOIC	Obsolete	4507 Pcs
AT25DF021A-SSHN-B	Renesas Electronics	2Mbit	104 MHz	1.65V ~ 3.6V	8-SOIC	Active	956 Pcs
AT25DF021A-SSHN-T	Renesas Electronics	2Mbit	104 MHz	1.65V ~ 3.6V	8-SOIC	Active	1470 Pcs
AT25XE021A-SSHN-B	Renesas Electronics	2Mbit	70 MHz	1.65V ~ 3.6V	8-SOIC	Active	2795 Pcs
AT25XE021A-SSHN-T	Renesas Electronics	2Mbit	70 MHz	1.65V ~ 3.6V	8-SOIC	Active	51698 Pcs
LE25U20AMB-AH	onsemi	2Mbit	30 MHz	2.3V ~ 3.6V	8-SOIC	Active	10300 Pcs
W25X20CLSNIG	Winbond Electronics	2Mbit	104 MHz	2.3V ~ 3.6V	8-SOIC	Active	55400 Pcs
W25X20CLSVIG	Winbond Electronics	2Mbit	104 MHz	2.3V ~ 3.6V	8-VSOP	Active	3256 Pcs

Engineering Selection Recommendations

Renesas Electronics AT25DF021A Series (Recommended for Renesas-based designs):

AT25DF021A-SSHN-T: Active product status with ROHS3 compliance and MSL 1 rating. Verified programmability. Highest reliability for production environments.
AT25DF021A-SSHN-B: Active product status with ROHS3 compliance. Tube packaging alternative to tape & reel format.

Renesas Electronics AT25XE021A Series (Recommended for extended frequency margin):

AT25XE021A-SSHN-T: Active product status with highest inventory availability (51698 Pcs). ROHS3 compliant with MSL 1 rating. Operates at 70 MHz with wider voltage range (1.65V ~ 3.6V).
AT25XE021A-SSHN-B: Active product status with ROHS3 compliance and MSL 1 rating. Tube packaging option.

onsemi LE25U20AMB-AH (Recommended for voltage-matched designs):

Maintains original voltage supply range (2.3V ~ 3.6V). Active product status with ROHS3 compliance. Operates at 30 MHz, suitable for applications not requiring higher clock frequencies.

Winbond Electronics W25X20 Series (Recommended for high-volume availability):

W25X20CLSNIG: Active product status with highest inventory (55400 Pcs). ROHS3 compliant. Operates at 104 MHz with verified programmability. Maintains original voltage range (2.3V ~ 3.6V).
W25X20CLSVIG: Active product status with 8-VSOP package variant. ROHS3 compliant. Use only if 8-VSOP package is acceptable for your PCB layout.

All substitute parts carry ROHS3 compliance and REACH unaffected status, meeting modern environmental and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can I use AT25DF021A-SSHN-T as a direct replacement for AT25DF021-SSHF-B?

A: Yes. Both parts share identical memory size (2Mbit), memory organization (256K x 8), SPI interface, 8-SOIC package, and operating temperature range (-40°C ~ 85°C). The AT25DF021A-SSHN-T operates at 104 MHz (higher than the original 50 MHz) and supports a wider voltage range (1.65V ~ 3.6V), making it fully backward compatible.

Q: What is the difference between AT25DF021A-SSHN-B and AT25DF021A-SSHN-T?

A: Both parts are electrically identical with 104 MHz operation and 1.65V ~ 3.6V voltage range. The primary difference is packaging: -B denotes Tube packaging while -T denotes Tape & Reel (TR) packaging. The -T variant has MSL 1 rating (unlimited moisture sensitivity) compared to MSL 3 for the -B variant. Select based on your procurement and assembly process requirements.

Q: Why does LE25U20AMB-AH operate at only 30 MHz?

A: The LE25U20AMB-AH is manufactured by onsemi and operates at 30 MHz. It remains a valid substitute because clock frequency is a flexible parameter—applications designed for 50 MHz operation will function correctly at 30 MHz, though with reduced maximum data throughput. This part is suitable for designs where lower clock frequency is acceptable.

Q: Can I use W25X20CLSVIG instead of W25X20CLSNIG?

A: W25X20CLSVIG uses an 8-VSOP package instead of the standard 8-SOIC package. While electrically equivalent, the different package footprint requires PCB layout modification. Use W25X20CLSVIG only if your PCB design accommodates the 8-VSOP form factor.

Q: Which substitute part has the best availability?

A: AT25XE021A-SSHN-T has the highest inventory at 51698 Pcs, followed by W25X20CLSNIG at 55400 Pcs. Both are active products with ROHS3 compliance and suitable for production designs.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance and REACH unaffected status, meeting current environmental regulations.

Q: What is the significance of MSL rating differences?

A: MSL (Moisture Sensitivity Level) indicates moisture exposure limits during storage and handling. MSL 1 (unlimited) parts like AT25DF021A-SSHN-T and AT25XE021A series have no moisture exposure restrictions. MSL 3 (168 hours) parts require controlled storage conditions. For production environments with standard moisture control, both ratings are acceptable.

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