AT45DB021D-SSH-T Equivalent & Substitute Parts

Part Overview

The AT45DB021D-SSH-T is a 2Mbit SPI FLASH memory IC manufactured by Renesas Electronics Corporation in an 8-SOIC surface mount package. This part operates at 66 MHz with a supply voltage range of 2.7V to 3.6V and is classified as obsolete. Due to its obsolete status, equivalent substitute parts from the same manufacturer are available to maintain design continuity and ensure supply chain reliability for applications requiring 2Mbit SPI FLASH memory functionality.

Key Parameters

Parameter	Value
Memory Size	2Mbit
Memory Format	FLASH
Memory Interface	SPI
Memory Organization	264 Bytes x 1024 pages
Clock Frequency	66 MHz
Voltage Supply Range	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package Type	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the AT45DB021D-SSH-T is based on the following critical parameters that must remain compatible:

Memory Size: 2Mbit (unchanged across all substitutes)
Memory Format: FLASH (unchanged)
Memory Interface: SPI (unchanged)
Memory Organization: 264 Bytes x 1024 pages (unchanged)
Package Type: 8-SOIC with identical physical dimensions (unchanged)
Operating Temperature Range: -40°C ~ 85°C (unchanged)

The substitute parts AT45DB021E-SSHN-T, AT45DB021E-SSHNHA-T, and AT45DB021E-SSHNHC-T are all active products from Renesas Electronics Corporation that maintain identical memory capacity, organization, interface protocol, and package specifications. These parts feature an increased clock frequency of 70 MHz and an expanded supply voltage range of 1.65V to 3.6V, providing enhanced performance and broader voltage compatibility while maintaining full functional equivalence for SPI FLASH memory applications.

Parameter Comparison

Parameter	AT45DB021D-SSH-T	AT45DB021E-SSHN-T	AT45DB021E-SSHNHA-T	AT45DB021E-SSHNHC-T
Memory Size	2Mbit	2Mbit	2Mbit	2Mbit
Memory Format	FLASH	FLASH	FLASH	FLASH
Memory Interface	SPI	SPI	SPI	SPI
Memory Organization	264 Bytes x 1024 pages	264 Bytes x 1024 pages	264 Bytes x 1024 pages	264 Bytes x 1024 pages
Clock Frequency	66 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
Operating Temperature	-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
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	Not specified	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

All three substitute parts (AT45DB021E-SSHN-T, AT45DB021E-SSHNHA-T, and AT45DB021E-SSHNHC-T) are active products with full regulatory compliance. The AT45DB021E-SSHN-T is the manufacturer-recommended primary substitute, verified as DiGi-Electronics Programmable and available in Cut Tape and Digi-Reel packaging with the highest inventory level (24,098 pcs). Both AT45DB021E-SSHNHA-T and AT45DB021E-SSHNHC-T are available in Tape & Reel packaging and maintain ROHS3 compliance and REACH unaffected status. All substitute parts provide improved performance characteristics with 70 MHz clock frequency and extended voltage supply range while maintaining identical memory capacity, organization, interface protocol, and package form factor.

Frequently Asked Questions (FAQ)

Q: Can AT45DB021E-SSHN-T directly replace AT45DB021D-SSH-T in existing designs?

A: Yes. Both parts share identical memory capacity (2Mbit), organization (264 Bytes x 1024 pages), SPI interface, 8-SOIC package dimensions, and operating temperature range (-40°C to 85°C). The substitute operates at 70 MHz versus 66 MHz and supports a wider supply voltage range (1.65V to 3.6V versus 2.7V to 3.6V), making it functionally compatible for direct replacement.

Q: What is the difference between AT45DB021E-SSHN-T, AT45DB021E-SSHNHA-T, and AT45DB021E-SSHNHC-T?

A: All three parts are electrically identical with the same memory specifications, clock frequency, and voltage range. The differences are in packaging format: AT45DB021E-SSHN-T is supplied in Cut Tape and Digi-Reel, while AT45DB021E-SSHNHA-T and AT45DB021E-SSHNHC-T are supplied in Tape & Reel format. Selection depends on procurement and assembly requirements.

Q: Are the substitute parts RoHS and REACH compliant?

A: Yes. All three substitute parts (AT45DB021E-SSHN-T, AT45DB021E-SSHNHA-T, and AT45DB021E-SSHNHC-T) are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: Why is the AT45DB021D-SSH-T obsolete?

A: The AT45DB021D-SSH-T has been superseded by the AT45DB021E series, which offers improved performance specifications including higher clock frequency (70 MHz) and extended voltage supply range (1.65V to 3.6V) while maintaining full backward compatibility in terms of memory capacity, organization, and package form factor.

Q: Can I use these parts interchangeably in production?

A: Yes, within the constraints of your circuit design. Verify that your application can accommodate the 70 MHz clock frequency and the extended voltage supply range (1.65V to 3.6V) of the substitute parts. The identical package dimensions and pin configuration ensure mechanical and electrical compatibility.

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