AT45DB021D-SH-B Equivalent & Substitute Parts

Part Overview

The AT45DB021D-SH-B is a 2Mbit FLASH memory IC with SPI interface operating at 66 MHz, manufactured by Microchip Technology in an 8-SOIC surface mount package. This part is classified as obsolete, necessitating identification of active equivalent alternatives for ongoing design requirements and production continuity. Substitute parts must maintain functional compatibility across memory capacity, interface protocol, and electrical operating parameters while accommodating packaging and performance variations.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile FLASH
Memory Size	2Mbit
Memory Interface	SPI
Clock Frequency	66 MHz
Memory Organization	264 Bytes x 1024 pages
Voltage Supply Range	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package Type	8-SOIC
Mounting Type	Surface Mount
Write Cycle Time (Page)	4ms

Substitute Part Grouping Explanation

Substitution eligibility for the AT45DB021D-SH-B is determined by the following critical parameters:

Core Compatibility Requirements:

Memory Size: 2Mbit (fixed requirement)
Memory Interface: SPI (fixed requirement)
Memory Type: Non-Volatile FLASH (fixed requirement)
Operating Temperature Range: -40°C ~ 85°C (fixed requirement)
Package Type: 8-SOIC (fixed requirement)
Mounting Type: Surface Mount (fixed requirement)

Performance Parameters (Allowable Variations):

Clock Frequency: Substitute parts operating at 70 MHz exceed the original 66 MHz specification and are functionally compatible
Voltage Supply Range: Substitute parts with 1.65V ~ 3.6V range encompass the original 2.7V ~ 3.6V range
Write Cycle Time: Substitute parts with 3ms page write time meet or exceed the original 4ms specification
Memory Organization: Variations between 256 Bytes x 1024 pages and 264 Bytes x 1024 pages are acceptable within the 2Mbit capacity constraint

All substitute parts listed are manufactured by Renesas Electronics Corporation and maintain active product status, ensuring long-term availability and supply chain continuity.

Parameter Comparison

Parameter	AT45DB021D-SH-B (Original)	AT45DB021E-SHN-B	AT45DB021E-SHN2B-T	AT45DB021E-SHNHA-T	AT45DB021E-SHNHC-T	AT45DB021E-SSHN2B-T	AT45DB021E-SSHNHA-T
Manufacturer	Microchip Technology	Renesas Electronics	Renesas Electronics	Renesas Electronics	Renesas Electronics	Renesas Electronics	Renesas Electronics
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
Memory Size	2Mbit	2Mbit	2Mbit	2Mbit	2Mbit	2Mbit	2Mbit
Memory Interface	SPI	SPI	SPI	SPI	SPI	SPI	SPI
Clock Frequency	66 MHz	70 MHz	70 MHz	70 MHz	70 MHz	70 MHz	70 MHz
Memory Organization	264 Bytes x 1024 pages	264 Bytes x 1024 pages	256 Bytes x 1024 pages	264 Bytes x 1024 pages	264 Bytes x 1024 pages	256 Bytes x 1024 pages	264 Bytes x 1024 pages
Voltage Supply Range	2.7V ~ 3.6V	1.65V ~ 3.6V	1.65V ~ 3.6V	1.65V ~ 3.6V	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	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	8-SOIC (0.209", 5.30mm Width)	8-SOIC (0.209", 5.30mm Width)	8-SOIC (0.209", 5.30mm Width)	8-SOIC (0.209", 5.30mm Width)	8-SOIC (0.209", 5.30mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
Packaging Format	Tube	Tube	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)
Write Cycle Time (Page)	4ms	3ms	3ms	3ms	3ms	3ms	3ms
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Primary Recommendation: AT45DB021E-SHN-B

The AT45DB021E-SHN-B is the preferred substitute for the obsolete AT45DB021D-SH-B. This part maintains identical package dimensions (8-SOIC 0.209" width), memory organization (264 Bytes x 1024 pages), and tube packaging format. The part is manufactured by Renesas Electronics Corporation with active product status, ensuring sustained availability. Verification status is confirmed as Verified by DiGi-Electronics. The 70 MHz clock frequency exceeds the original 66 MHz specification, and the 3ms page write cycle time improves upon the original 4ms specification. The expanded voltage supply range (1.65V ~ 3.6V) provides additional design flexibility while maintaining full compatibility with the original 2.7V ~ 3.6V operating range.

Secondary Recommendations:

AT45DB021E-SHN2B-T and AT45DB021E-SHNHA-T are suitable alternatives when Tape & Reel packaging is required for automated assembly processes. Both parts maintain the standard 8-SOIC package width (0.209", 5.30mm). The AT45DB021E-SHN2B-T features 256 Bytes x 1024 pages memory organization, while AT45DB021E-SHNHA-T maintains 264 Bytes x 1024 pages organization. Both are active products with equivalent electrical performance.

AT45DB021E-SHNHC-T provides an alternative with identical memory organization (264 Bytes x 1024 pages) and Tape & Reel packaging, suitable for applications requiring this specific configuration.

Compact Package Alternatives:

AT45DB021E-SSHN2B-T and AT45DB021E-SSHNHA-T feature a narrower 8-SOIC package (0.154", 3.90mm width), suitable for space-constrained applications. These parts are available in Cut Tape and Tape & Reel formats respectively. The narrower package dimension requires PCB layout verification to ensure compatibility with existing footprints designed for the standard 0.209" width package.

All substitute parts maintain ROHS3 compliance and REACH Unaffected status, meeting regulatory requirements equivalent to the original part.

Frequently Asked Questions (FAQ)

Q: Can AT45DB021E series parts directly replace the AT45DB021D-SH-B in existing designs?

A: Yes. All listed substitute parts maintain identical memory capacity (2Mbit), interface protocol (SPI), operating temperature range (-40°C ~ 85°C), and surface mount 8-SOIC package type. The primary consideration is package width: standard substitutes maintain the original 0.209" width, while compact alternatives feature 0.154" width and require PCB footprint verification.

Q: What is the significance of the higher 70 MHz clock frequency in substitute parts?

A: The 70 MHz specification in AT45DB021E series parts exceeds the original 66 MHz requirement and is functionally compatible. Designs operating at 66 MHz will function correctly with 70 MHz-rated parts. The higher frequency rating provides performance headroom and does not introduce compatibility issues.

Q: Are there differences in memory organization between substitute parts?

A: Yes. Some substitute parts feature 256 Bytes x 1024 pages organization while others maintain 264 Bytes x 1024 pages. Both configurations deliver 2Mbit total capacity. Design compatibility depends on whether the application firmware or hardware specifically addresses the page size. Verify firmware compatibility with the selected part's memory organization before implementation.

Q: What packaging format should be selected for production?

A: Selection depends on assembly process requirements. Tube packaging (AT45DB021E-SHN-B) suits manual or semi-automated assembly. Tape & Reel formats (TR designation) are standard for automated pick-and-place assembly. Cut Tape & Digi-Reel format (AT45DB021E-SSHN2B-T) provides flexibility for mixed-volume production. All formats contain identical die and electrical specifications.

Q: Is the expanded voltage supply range (1.65V ~ 3.6V) in substitute parts a concern?

A: No. The expanded range encompasses the original 2.7V ~ 3.6V specification. Designs operating within the original voltage range will function identically with substitute parts. The lower voltage floor (1.65V) provides additional design flexibility for future applications without affecting existing designs.

Q: What is the impact of the 3ms versus 4ms page write cycle time?

A: Substitute parts with 3ms page write time provide faster write performance compared to the original 4ms specification. This improvement is backward compatible; designs accounting for 4ms write cycles will experience faster operation with substitute parts. No design modifications are required.

Q: Are all substitute parts verified for programmability?

A: AT45DB021E-SHN-B is verified as programmable by DiGi-Electronics. Other substitute parts (AT45DB021E-SHN2B-T, AT45DB021E-SHNHA-T, AT45DB021E-SHNHC-T, AT45DB021E-SSHN2B-T, AT45DB021E-SSHNHA-T) are listed as Not Verified. Verification status indicates testing confirmation but does not affect functional compatibility. All parts are manufactured to identical electrical specifications.

Q: Can compact package alternatives (0.154" width) be used in existing PCB designs?

A: Compact alternatives require PCB footprint verification. The narrower 0.154" width differs from the standard 0.209" width used in the original design. Physical layout compatibility must be confirmed before component selection. If the existing footprint accommodates only the standard width, compact alternatives are not suitable without PCB redesign.

Q: What is the supply status for each substitute part?

A: All substitute parts maintain active product status with Renesas Electronics Corporation, ensuring long-term availability. Inventory levels vary: AT45DB021E-SHN-B (12,038 pcs), AT45DB021E-SHN2B-T (3,997 pcs), AT45DB021E-SHNHA-T (1,892 pcs), AT45DB021E-SHNHC-T (2,182 pcs), AT45DB021E-SSHN2B-T (4,144 pcs), and AT45DB021E-SSHNHA-T (1,110 pcs). Active status provides design security for new production and long-term support.

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