AT45DB021D-SH-T Equivalent & Substitute Parts

Part Overview

The AT45DB021D-SH-T is a 2Mbit SPI FLASH memory IC manufactured by Renesas Electronics Corporation in an 8-SOIC package. This part operates at 66 MHz with a supply voltage range of 2.7V to 3.6V and is rated for -40°C to 85°C operating temperature. The AT45DB021D-SH-T has reached obsolete product status, making identification of functionally equivalent alternatives necessary for ongoing design support and production continuity.

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 (0.209", 5.30mm Width)
Mounting Type	Surface Mount
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the AT45DB021D-SH-T is determined by the following critical parameters:

Core Compatibility Requirements:

Memory Size: 2Mbit (fixed)
Memory Format: FLASH (fixed)
Memory Interface: SPI (fixed)
Memory Organization: 264 Bytes x 1024 pages (fixed)
Package Type: 8-SOIC (fixed)
Operating Temperature Range: -40°C ~ 85°C (fixed)

Allowable Parameter Variations:

Clock Frequency: The substitute parts operate at 70 MHz, which exceeds the original 66 MHz specification. Higher clock frequency is backward compatible with designs requiring 66 MHz operation.
Voltage Supply Range: Substitute parts accept 1.65V ~ 3.6V, which encompasses the original 2.7V ~ 3.6V range. Extended lower voltage support is backward compatible.
Write Cycle Time: Substitute parts specify 8µs (word) and 3ms (page), providing improved performance over the original 4ms page write time.

All substitute parts maintain identical memory capacity, interface protocol, package footprint, and thermal operating range as the original AT45DB021D-SH-T.

Parameter Comparison

Parameter	AT45DB021D-SH-T (Original)	AT45DB021E-SHN-B	AT45DB021E-SHN-T	AT45DB021E-SHNHA-T	AT45DB021E-SHNHC-T
Manufacturer	Renesas Electronics	Renesas Electronics	Renesas Electronics	Renesas Electronics	Renesas Electronics
Memory Size	2Mbit	2Mbit	2Mbit	2Mbit	2Mbit
Memory Format	FLASH	FLASH	FLASH	FLASH	FLASH
Memory Interface	SPI	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	264 Bytes x 1024 pages
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
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active
Packaging Format	Not specified	Tube	Tape & Reel	Tape & Reel	Tape & Reel
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All four substitute parts are manufactured by Renesas Electronics and maintain full functional and electrical compatibility with the AT45DB021D-SH-T. Selection among the substitute options is determined by packaging and compliance requirements:

AT45DB021E-SHN-B: Supplied in Tube packaging. DiGi-Electronics Programmable status is Verified. ROHS3 Compliant. Recommended for applications requiring tube packaging format.

AT45DB021E-SHN-T: Supplied in Tape & Reel packaging. DiGi-Electronics Programmable status is Verified. ROHS3 Compliant. Recommended for high-volume production requiring automated handling.

AT45DB021E-SHNHA-T: Supplied in Tape & Reel packaging. DiGi-Electronics Programmable status is Not Verified. ROHS3 Compliant. Functionally equivalent with alternative tape & reel configuration.

AT45DB021E-SHNHC-T: Supplied in Tape & Reel packaging. DiGi-Electronics Programmable status is Not Verified. ROHS3 Compliant. Functionally equivalent with alternative tape & reel configuration.

All substitute parts exceed the original specifications in clock frequency (70 MHz vs. 66 MHz), extended voltage support (1.65V minimum vs. 2.7V minimum), and improved write cycle performance (3ms vs. 4ms page write time).

Frequently Asked Questions (FAQ)

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

A: Yes. The AT45DB021E series maintains identical memory capacity (2Mbit), interface protocol (SPI), memory organization (264 Bytes x 1024 pages), package type (8-SOIC), and operating temperature range (-40°C to 85°C). All electrical parameters of the substitute parts are backward compatible with the original design.

Q: What is the difference between the four substitute part numbers?

A: The primary differences are packaging format and DiGi-Electronics Programmable verification status. AT45DB021E-SHN-B uses Tube packaging with Verified programmable status. AT45DB021E-SHN-T, AT45DB021E-SHNHA-T, and AT45DB021E-SHNHC-T use Tape & Reel packaging. The latter two have Not Verified programmable status. All four are functionally identical in electrical and memory specifications.

Q: Are there voltage compatibility concerns when substituting?

A: No. The substitute parts support 1.65V to 3.6V supply voltage, which encompasses the original part's 2.7V to 3.6V range. Designs operating at 2.7V or higher are fully compatible.

Q: Does the higher clock frequency (70 MHz vs. 66 MHz) affect compatibility?

A: No. Higher clock frequency is backward compatible. Designs operating at 66 MHz will function correctly with 70 MHz-rated parts.

Q: What packaging format should be selected for production?

A: Tape & Reel packaging (AT45DB021E-SHN-T, AT45DB021E-SHNHA-T, AT45DB021E-SHNHC-T) is standard for automated assembly processes. Tube packaging (AT45DB021E-SHN-B) is suitable for manual assembly or lower-volume applications.

Q: Are all substitute parts RoHS compliant?

A: Yes. All four substitute parts are ROHS3 Compliant, meeting current environmental and hazardous substance restrictions.

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