AT45DB021B-SI Equivalent & Substitute Parts

Part Overview

The AT45DB021B-SI is a 2Mbit SPI FLASH memory IC manufactured by Microchip Technology in an 8-SOIC package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The AT45DB021B-SI operates at 20 MHz with a supply voltage range of 2.7V to 3.6V and is suitable for non-volatile storage applications requiring SPI interface connectivity.

Key Parameters

Parameter	Value
Memory Size	2Mbit
Memory Format	FLASH
Memory Interface	SPI
Memory Organization	264 Bytes x 1024 pages
Clock Frequency	20 MHz
Voltage Supply Range	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package Type	8-SOIC
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the AT45DB021B-SI is determined by 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 (primary mechanical constraint)
Supply Voltage Compatibility: Substitute must operate within or encompass the original 2.7V ~ 3.6V range
Operating Temperature Range: -40°C ~ 85°C (fixed requirement)
Product Status: Active status preferred for long-term availability

All substitute parts listed maintain identical memory capacity, organization, interface, and temperature specifications. Substitute parts operate at higher clock frequencies (70 MHz) and support extended voltage ranges (1.65V ~ 3.6V), providing enhanced performance while maintaining backward compatibility. Package width variations exist among substitutes and must be evaluated for mechanical fit in existing designs.

Parameter Comparison

Parameter	AT45DB021B-SI	AT45DB021E-SHN-T	AT45DB021E-SHNHA-T	AT45DB021E-SHNHC-T	AT45DB021E-SSHNHC-T
Manufacturer	Microchip Technology	Renesas Electronics	Renesas Electronics	Renesas Electronics	Renesas Electronics
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	20 MHz	70 MHz	70 MHz	70 MHz	70 MHz
Voltage Supply Range	2.7V ~ 3.6V	1.65V ~ 3.6V	1.65V ~ 3.6V	1.65V ~ 3.6V	1.65V ~ 3.6V
Write Cycle Time (Page)	14ms	3ms	3ms	3ms	3ms
Operating Temperature	-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)	8-SOIC (0.209", 5.30mm)	8-SOIC (0.209", 5.30mm)	8-SOIC (0.209", 5.30mm)	8-SOIC (0.154", 3.90mm)
Packaging	Bulk	Tape & Reel	Tape & Reel	Tape & Reel	Tape & Reel
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

AT45DB021E-SHN-T is the primary recommended substitute. This part is manufactured by Renesas Electronics with active product status, ensuring long-term availability and supply chain stability. It carries ROHS3 compliance certification and is verified as programmable through DiGi-Electronics. The identical 8-SOIC package footprint (0.209", 5.30mm width) ensures direct mechanical compatibility with existing PCB designs. The extended voltage range (1.65V ~ 3.6V) encompasses the original specification, and the 70 MHz clock frequency provides performance enhancement over the obsolete AT45DB021B-SI.

AT45DB021E-SHNHA-T and AT45DB021E-SHNHC-T are functionally equivalent alternatives with identical electrical specifications and package dimensions to AT45DB021E-SHN-T. Both maintain active product status and ROHS3 compliance. Selection between these three parts should be based on inventory availability and supplier lead times.

AT45DB021E-SSHNHC-T is a secondary option with identical electrical specifications but features a narrower 8-SOIC package (0.154", 3.90mm width). This package width variation requires PCB footprint verification before selection. This part is suitable only for new designs where the narrower package can be accommodated.

Frequently Asked Questions (FAQ)

Q: Can AT45DB021E series parts directly replace the AT45DB021B-SI in existing designs?

A: Yes, for designs using the standard 8-SOIC package width (0.209", 5.30mm). AT45DB021E-SHN-T, AT45DB021E-SHNHA-T, and AT45DB021E-SHNHC-T maintain identical pin configuration, memory organization, and SPI interface protocol. The extended voltage range and higher clock frequency are backward compatible. AT45DB021E-SSHNHC-T requires PCB footprint verification due to its narrower package width.

Q: What is the primary advantage of substituting to AT45DB021E series parts?

A: The AT45DB021E series offers active product status with guaranteed long-term availability, ROHS3 compliance for regulatory requirements, and improved performance with 70 MHz clock frequency versus the original 20 MHz specification. Write cycle time is reduced from 14ms to 3ms.

Q: Are there any voltage compatibility concerns?

A: No. The original AT45DB021B-SI operates at 2.7V ~ 3.6V. All AT45DB021E substitutes support 1.65V ~ 3.6V, which fully encompasses the original range. Designs operating at the original voltage specification will function without modification.

Q: What is the difference between AT45DB021E-SHN-T and AT45DB021E-SSHNHC-T?

A: Both parts are electrically identical with 2Mbit capacity, SPI interface, and 70 MHz operation. The primary difference is package width: AT45DB021E-SHN-T uses standard 8-SOIC (0.209", 5.30mm width), while AT45DB021E-SSHNHC-T uses narrow 8-SOIC (0.154", 3.90mm width). PCB footprint compatibility must be verified before selecting the narrow package variant.

Q: Is the Tape & Reel packaging compatible with bulk component handling?

A: Tape & Reel packaging is standard for automated assembly processes. If manual handling or bulk storage is required, consult with your supplier regarding alternative packaging options or reel-to-bulk conversion services.

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