AT45DB021B-SC Equivalent & Substitute Parts

Part Overview

The AT45DB021B-SC is a 2Mbit Serial Peripheral Interface (SPI) FLASH memory integrated circuit manufactured by Microchip Technology. This device operates at 20 MHz and is housed in an 8-SOIC surface mount package. The AT45DB021B-SC is classified as obsolete, necessitating identification of functionally equivalent substitute components for ongoing design support and production requirements. Substitute parts must maintain compatibility with the core memory specifications while accommodating updated manufacturing standards and enhanced performance characteristics.

Substiute Parts

AT45DB021B-SC

Microchip TechnologyIn Stock: 1465AT45DB021B-SC Datasheet

Current PartRFQ

AT45DB021E-SHN-B

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

MFR RecommendedRFQ

AT45DB021E-SHN-T

Renesas Electronics CorporationIn Stock: 2436AT45DB021E-SHN-T Datasheet

MFR RecommendedRFQ

AT45DB021E-SSHNHA-T

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

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AT45DB021B-SC are selected based on strict adherence to the following core parameters:

Critical Compatibility Parameters:

• Memory Size: 2Mbit (fixed requirement)
• Memory Format: FLASH (fixed requirement)
• Memory Organization: 264 Bytes x 1024 pages (fixed requirement)
• Memory Interface: SPI (fixed requirement)
• Base Product Number: AT45DB021 (fixed requirement)
• Package / Case: 8-SOIC (fixed requirement)
• Mounting Type: Surface Mount (fixed requirement)

All substitute parts designated AT45DB021E variants maintain these core specifications, ensuring functional equivalence at the memory architecture level. Variations in clock frequency, voltage supply range, operating temperature range, and packaging format (Tube vs. Tape & Reel) represent enhancements or format options that do not compromise substitution compatibility.

Parameter Comparison

Engineering Selection Recommendations

AT45DB021E-SHN-B (Tube Packaging)

This substitute is recommended for applications requiring tube packaging format. The part maintains the standard 8-SOIC package width (0.209", 5.30mm) and is actively manufactured by Renesas Electronics Corporation. The device achieves ROHS3 compliance and extends both the operating temperature range and supply voltage range relative to the original AT45DB021B-SC. Programmable verification status is confirmed.

AT45DB021E-SHN-T (Tape & Reel Packaging)

This substitute is recommended for high-volume production environments utilizing automated assembly processes with tape and reel component feeding. The part maintains the standard 8-SOIC package width (0.209", 5.30mm) and is actively manufactured with confirmed programmable verification status. ROHS3 compliance is achieved.

AT45DB021E-SSHNHA-T (Tape & Reel Packaging, Narrow Package)

This substitute is recommended for space-constrained applications where the narrower 8-SOIC package width (0.154", 3.90mm) provides design advantage. The part is actively manufactured in tape and reel format and achieves ROHS3 compliance. Programmable verification status is not verified for this variant.

All three substitute parts are actively produced, ROHS3 compliant, and functionally equivalent at the memory architecture level. Selection between variants depends on packaging format requirements (tube vs. tape & reel) and physical package width constraints.

Frequently Asked Questions (FAQ)

Q: Can AT45DB021E variants directly replace the AT45DB021B-SC in existing designs?

A: Yes. All AT45DB021E variants maintain identical memory size (2Mbit), memory organization (264 Bytes x 1024 pages), SPI interface, and 8-SOIC surface mount package. The core memory architecture is functionally equivalent. Designs operating within the AT45DB021E supply voltage range (1.65V ~ 3.6V) and temperature range (-40°C ~ 85°C) experience no functional incompatibility.

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

A: The primary difference is packaging format. AT45DB021E-SHN-B is supplied in Tube packaging, suitable for manual assembly or lower-volume production. AT45DB021E-SHN-T is supplied in Tape & Reel format, optimized for automated pick-and-place assembly in high-volume manufacturing environments. Both maintain identical electrical specifications and the standard 8-SOIC package width (0.209", 5.30mm).

Q: Why does AT45DB021E-SSHNHA-T have a different package width?

A: The AT45DB021E-SSHNHA-T uses a narrower 8-SOIC package (0.154", 3.90mm width) compared to the standard width (0.209", 5.30mm) used in AT45DB021E-SHN-B and AT45DB021E-SHN-T. This narrower package is beneficial for space-constrained PCB layouts. Pin configuration and electrical function remain identical.

Q: Are there compliance differences between the original AT45DB021B-SC and substitute parts?

A: Yes. The AT45DB021B-SC is RoHS non-compliant, while all AT45DB021E variants achieve ROHS3 compliance. This represents an improvement in environmental and regulatory compliance. All parts maintain REACH Unaffected status and EAR99 export classification.

Q: What are the performance improvements in AT45DB021E variants?

A: AT45DB021E variants operate at 70 MHz clock frequency compared to 20 MHz in the original AT45DB021B-SC, providing 3.5x faster operation. Page write cycle time is reduced from 14ms to 3ms. Supply voltage range is extended to 1.65V minimum (from 2.7V), and operating temperature range is expanded to -40°C ~ 85°C (from 0°C ~ 70°C).

Q: Which substitute should be selected for new production designs?

A: For new designs, AT45DB021E-SHN-T (Tape & Reel) is recommended for high-volume automated assembly. For lower-volume or manual assembly processes, AT45DB021E-SHN-B (Tube) is appropriate. AT45DB021E-SSHNHA-T is selected when the narrower package width provides PCB layout advantage. All three are actively manufactured and ROHS3 compliant.

Q: Is programmable verification status critical for substitution?

A: Programmable verification status indicates factory confirmation of device programmability. AT45DB021E-SHN-B and AT45DB021E-SHN-T carry verified status. AT45DB021E-SSHNHA-T carries unverified status. For applications requiring confirmed programmability documentation, AT45DB021E-SHN-B or AT45DB021E-SHN-T are preferred.