AT45DB021B-SU Equivalent & Substitute Parts

Part Overview

The AT45DB021B-SU is a 2Mbit Serial Peripheral Interface (SPI) FLASH memory IC manufactured by Microchip Technology, packaged in 8-SOIC form factor. This device operates at 20 MHz clock frequency with a supply voltage range of 2.7V to 3.6V and is rated for -40°C to 85°C operating temperature. The AT45DB021B-SU is classified as obsolete product status. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and legacy system support.

Substiute Parts

AT45DB021B-SU

Microchip TechnologyIn Stock: 23411AT45DB021B-SU Datasheet

Current PartRFQ

AT45DB021E-SHN-B

Renesas Electronics CorporationIn Stock: 12131AT45DB021E-SHN-B Datasheet

MFR RecommendedRFQ

AT45DB021E-SHN2B-T

Renesas Electronics CorporationIn Stock: 4020AT45DB021E-SHN2B-T Datasheet

MFR RecommendedRFQ

AT45DB021E-SHNHC-T

Renesas Electronics CorporationIn Stock: 2225AT45DB021E-SHNHC-T Datasheet

MFR RecommendedRFQ

AT45DB021E-SSHN-B

Renesas Electronics CorporationIn Stock: 1285AT45DB021E-SSHN-B Datasheet

MFR RecommendedRFQ

AT45DB021E-SSHNHA-T

Renesas Electronics CorporationIn Stock: 1124AT45DB021E-SSHNHA-T Datasheet

MFR RecommendedRFQ

AT45DB021E-SSHNHC-T

Renesas Electronics CorporationIn Stock: 1256AT45DB021E-SSHNHC-T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AT45DB021B-SU are qualified based on the following critical parameters:

• Memory Capacity: 2Mbit (fixed requirement)
• Memory Type & Format: Non-Volatile FLASH (fixed requirement)
• Interface Protocol: SPI (fixed requirement)
• Package Type: 8-SOIC Surface Mount (fixed requirement)
• Operating Temperature Range: -40°C ~ 85°C (fixed requirement)
• Supply Voltage Compatibility: Substitute parts must support the 2.7V ~ 3.6V range or broader range that encompasses it
• Base Product Number: AT45DB021 (device family)

All substitute parts listed are manufactured by Renesas Electronics Corporation and maintain the AT45DB021 base product number. Substitutes feature improved specifications including higher clock frequency (70 MHz) and faster write cycle times (3ms page write versus 14ms), while maintaining backward compatibility with the original electrical and mechanical interfaces.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts are active products manufactured by Renesas Electronics Corporation and maintain ROHS3 compliance and REACH unaffected status, matching the regulatory posture of the original AT45DB021B-SU.

Primary Substitutes (0.209" / 5.30mm Width Package):

• AT45DB021E-SHN-B (Tube packaging)
• AT45DB021E-SHN2B-T (Tape & Reel packaging)
• AT45DB021E-SHNHC-T (Tape & Reel packaging)

These parts maintain the original 8-SOIC package width and are direct mechanical replacements. All three are verified as programmable by DiGi-Electronics or carry active product status.

Secondary Substitutes (0.154" / 3.90mm Width Package):

• AT45DB021E-SSHN-B (Tube packaging)
• AT45DB021E-SSHNHA-T (Tape & Reel packaging)
• AT45DB021E-SSHNHC-T (Tape & Reel packaging)

These parts feature a narrower 8-SOIC package footprint and require PCB layout verification for mechanical compatibility. AT45DB021E-SSHN-B is verified as programmable.

All substitute parts provide enhanced performance characteristics (70 MHz clock frequency, 3ms page write cycle) while maintaining full backward compatibility with the original 2.7V ~ 3.6V supply voltage specification through their extended 1.65V ~ 3.6V operating range.

Frequently Asked Questions (FAQ)

Q: Can AT45DB021E series parts directly replace the AT45DB021B-SU?

A: Yes. All listed AT45DB021E variants maintain identical memory capacity (2Mbit), interface protocol (SPI), operating temperature range (-40°C ~ 85°C), and package type (8-SOIC Surface Mount). The supply voltage range of AT45DB021E parts (1.65V ~ 3.6V) encompasses the original specification (2.7V ~ 3.6V), ensuring full electrical compatibility.

Q: What is the difference between the 0.209" and 0.154" package width variants?

A: Both are 8-SOIC packages with identical pin pitch and electrical characteristics. The difference is physical package width: 0.209" (5.30mm) versus 0.154" (3.90mm). The narrower 0.154" variant requires verification that existing PCB footprints and assembly equipment can accommodate the reduced width. Electrical performance and memory organization remain identical.

Q: Does the higher clock frequency (70 MHz) of substitute parts affect compatibility?

A: No. The AT45DB021E parts operate at 70 MHz maximum clock frequency, which is backward compatible with systems designed for 20 MHz operation. The SPI interface allows clock frequency to be set by the host controller, so existing firmware and hardware designs will function without modification.

Q: What is the significance of the memory organization difference (264 vs. 256 bytes)?

A: The AT45DB021E-SHN2B-T variant specifies 256 Bytes x 1024 pages organization, while other parts specify 264 Bytes x 1024 pages. This represents a minor difference in page structure. Verify application firmware compatibility with the specific memory organization before selection.

Q: Are there packaging format considerations for production?

A: Yes. Tube packaging (AT45DB021E-SHN-B, AT45DB021E-SSHN-B) is suitable for manual assembly or low-volume production. Tape & Reel packaging (SHN2B-T, SHNHC-T, SSHNHA-T, SSHNHC-T variants) is optimized for automated pick-and-place assembly in high-volume manufacturing.

Q: What is the DiGi-Electronics Programmable verification status?

A: This indicates whether the part has been verified as programmable through DiGi-Electronics testing. AT45DB021E-SHN-B and AT45DB021E-SSHN-B are verified. Other variants carry "Not Verified" status but are active products from Renesas Electronics with full manufacturer support.