AT45DB021D-SH-B Equivalent & Substitute Parts

Part Overview

The AT45DB021D-SH-B is a 2Mbit SPI FLASH memory IC manufactured by Renesas Electronics Corporation in an 8-SOIC package. This part is classified as obsolete, making substitute parts necessary for new designs and ongoing production requirements. The AT45DB021D-SH-B operates at 66 MHz with a supply voltage range of 2.7V to 3.6V and is suitable for applications requiring non-volatile serial memory storage.

Key Parameters

Parameter	Value
Memory Size	2Mbit
Memory Format	FLASH
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 (0.209", 5.30mm Width)
Mounting Type	Surface Mount
Write Cycle Time (Page)	4ms

Substitute Part Grouping Explanation

Substitute parts for the AT45DB021D-SH-B are qualified based on the following critical parameters:

Memory Capacity: 2Mbit (fixed requirement)
Memory Organization: 264 Bytes x 1024 pages (fixed requirement)
Interface Protocol: SPI (fixed requirement)
Package Type: 8-SOIC with 0.209" width, 5.30mm (fixed requirement)
Operating Temperature Range: -40°C ~ 85°C (fixed requirement)
Voltage Supply Compatibility: Substitute parts must support the original supply voltage range or provide extended compatibility

All qualified substitutes are from the AT45DB021E series, which maintains identical memory capacity, organization, interface, and package specifications. The primary differences are enhanced clock frequency (70 MHz vs. 66 MHz), improved write cycle time, extended voltage supply range (1.65V ~ 3.6V), and active product status with full compliance certifications.

Parameter Comparison

Parameter	AT45DB021D-SH-B (Original)	AT45DB021E-SHN-B	AT45DB021E-SHN-T	AT45DB021E-SHNHA-T	AT45DB021E-SHNHC-T
Memory Size	2Mbit	2Mbit	2Mbit	2Mbit	2Mbit
Memory Organization	264 Bytes x 1024 pages	264 Bytes x 1024 pages	264 Bytes x 1024 pages	264 Bytes x 1024 pages	264 Bytes x 1024 pages
Memory Interface	SPI	SPI	SPI	SPI	SPI
Clock Frequency	66 MHz	70 MHz	70 MHz	70 MHz	70 MHz
Write Cycle Time (Page)	4ms	3ms	3ms	3ms	3ms
Voltage Supply Range	2.7V ~ 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
Package Type	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Product Status	Obsolete	Active	Active	Active	Active
Packaging Format	Tube	Tube	Tape & Reel	Tape & Reel	Tape & Reel
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	Not specified	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

All four substitute parts from the AT45DB021E series are functionally compatible with the AT45DB021D-SH-B at the electrical and mechanical level. Selection among substitutes should be based on the following criteria:

AT45DB021E-SHN-B is the primary recommended substitute. It maintains tube packaging consistent with the original part format and carries verified DiGi-Electronics programmability status. This part is actively manufactured and holds ROHS3 compliance and REACH unaffected certification.

AT45DB021E-SHN-T is suitable for high-volume production environments requiring tape and reel packaging. This part is actively manufactured with verified programmability status and full compliance certifications.

AT45DB021E-SHNHA-T and AT45DB021E-SHNHC-T are alternative tape and reel options for production applications. Both are actively manufactured with ROHS3 compliance and REACH unaffected status. Programmability verification status differs from AT45DB021E-SHN-T.

All substitutes provide performance improvements over the original part, including higher clock frequency (70 MHz vs. 66 MHz), faster page write cycle time (3ms vs. 4ms), and extended lower voltage supply compatibility (1.65V minimum vs. 2.7V minimum).

Frequently Asked Questions (FAQ)

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

A: Yes. All AT45DB021E variants maintain identical memory capacity (2Mbit), memory organization (264 Bytes x 1024 pages), SPI interface protocol, 8-SOIC package dimensions, and operating temperature range. The parts are pin-compatible and functionally equivalent.

Q: What are the key differences between AT45DB021D and AT45DB021E?

A: The AT45DB021E series operates at 70 MHz compared to 66 MHz for the AT45DB021D. Page write cycle time is reduced from 4ms to 3ms. The supply voltage range is extended to 1.65V minimum, providing broader operating flexibility. The AT45DB021E series is actively manufactured while AT45DB021D is obsolete.

Q: Does packaging format affect electrical compatibility?

A: No. Tube and tape & reel packaging formats contain identical die and electrical specifications. Packaging selection is determined by production volume and assembly line requirements, not electrical performance.

Q: Are all substitute parts RoHS and REACH compliant?

A: Yes. All AT45DB021E substitute parts carry ROHS3 compliance and REACH unaffected certification. The original AT45DB021D-SH-B compliance status is not specified in available documentation.

Q: What is the significance of DiGi-Electronics programmability verification?

A: Programmability verification indicates that the part has been tested and confirmed compatible with DiGi-Electronics programming equipment and procedures. AT45DB021E-SHN-B and AT45DB021E-SHN-T carry verified status. AT45DB021E-SHNHA-T and AT45DB021E-SHNHC-T are not verified but remain functionally compatible.

Q: Can I use AT45DB021E parts in existing designs without modification?

A: Yes. All substitute parts are pin-compatible and electrically compatible with the original AT45DB021D-SH-B. No circuit modifications are required for direct substitution.

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