AT24C1024BW-SH-T EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The AT24C1024BW-SH-T is a 1Mbit EEPROM memory IC manufactured by Microchip Technology, featuring I2C interface operation at 1 MHz with 550 ns access time in an 8-SOIC package. This part is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and production continuity. The device operates across a supply voltage range of 1.8V to 3.6V and supports operating temperatures from -40°C to 85°C. Substitute parts must maintain functional compatibility through matching memory capacity, interface protocol, and package form factor while accommodating variations in clock frequency and access time specifications.

Substiute Parts

AT24C1024BW-SH-T

Microchip TechnologyIn Stock: 2562AT24C1024BW-SH-T Datasheet

Current PartRFQ

24AA1025-I/SM

Microchip TechnologyIn Stock: 567324AA1025-I/SM Datasheet

DirectRFQ

24AA1025T-I/SM

Microchip TechnologyIn Stock: 415724AA1025T-I/SM Datasheet

MFR RecommendedRFQ

24AA1026-I/SM

Microchip TechnologyIn Stock: 343524AA1026-I/SM Datasheet

MFR RecommendedRFQ

24AA1026T-I/SM

Microchip TechnologyIn Stock: 78324AA1026T-I/SM Datasheet

MFR RecommendedRFQ

24FC1025T-I/SM

Microchip TechnologyIn Stock: 172224FC1025T-I/SM Datasheet

MFR RecommendedRFQ

24FC1026-I/SM

Microchip TechnologyIn Stock: 70124FC1026-I/SM Datasheet

MFR RecommendedRFQ

24FC1026T-I/SM

Microchip TechnologyIn Stock: 70024FC1026T-I/SM Datasheet

MFR RecommendedRFQ

AT24CM01-SHM-T

Microchip TechnologyIn Stock: 3068AT24CM01-SHM-T Datasheet

MFR RecommendedRFQ

CAT24M01XI-T2

onsemiIn Stock: 1847CAT24M01XI-T2 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT24C1024BW-SH-T is determined by strict adherence to the following electrical and mechanical parameters:

Primary Compatibility Criteria:

• Memory Size: 1Mbit (128K x 8 organization)
• Memory Interface: I2C protocol
• Package Type: 8-SOIC form factor
• Operating Temperature Range: -40°C to 85°C minimum
• Write Cycle Time: 5 ms

Secondary Variation Parameters (Allowable Differences):

• Clock Frequency: 400 kHz or 1 MHz operation
• Access Time: 400 ns, 550 ns, or 900 ns
• Voltage Supply Range: Minimum 1.7V to 1.8V; Maximum 3.6V to 5.5V
• Product Status: Active or Obsolete

Substitute parts are grouped into two categories based on clock frequency alignment:

Category 1 – 1 MHz Clock Frequency (Direct Speed Match): 24FC1025T-I/SM, 24FC1026-I/SM, 24FC1026T-I/SM, AT24CM01-SHM-T, CAT24M01XI-T2

Category 2 – 400 kHz Clock Frequency (Reduced Speed Operation): 24AA1025-I/SM, 24AA1025T-I/SM, 24AA1026-I/SM, 24AA1026T-I/SM

All substitute parts maintain 8-SOIC packaging, I2C interface, 1Mbit capacity, and -40°C to 85°C operating temperature range.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement with Identical Specifications:

AT24CM01-SHM-T is the primary active equivalent, maintaining 1 MHz clock frequency and 550 ns access time identical to the AT24C1024BW-SH-T. This part is manufactured by Microchip Technology, carries active product status, and is ROHS3 compliant. The extended voltage supply range (1.7V to 5.5V) provides broader application compatibility compared to the original 1.8V to 3.6V specification.

For 1 MHz Operation with Improved Access Time:

24FC1025T-I/SM and 24FC1026T-I/SM offer 1 MHz clock frequency with superior 400 ns access time. Both parts are manufactured by Microchip Technology with active product status and verified programmability. The 24FC1025T-I/SM carries verified programmability status, supporting direct integration into existing designs. These parts operate across 1.8V to 5.5V supply range.

For Reduced Clock Frequency Applications:

24AA1025-I/SM and 24AA1025T-I/SM operate at 400 kHz with 900 ns access time. Both are active Microchip Technology products with verified programmability. These parts support extended voltage range (1.7V to 5.5V) and are suitable for applications where lower clock frequency is acceptable. The 24AA1025T-I/SM is available in Cut Tape and Digi-Reel packaging.

For Cross-Manufacturer Compatibility:

CAT24M01XI-T2 manufactured by onsemi provides 1 MHz operation with 400 ns access time in 8-SOIC package. This part carries verified programmability status and active product status. Moisture sensitivity level is rated at 3 (168 Hours), compared to level 1 for Microchip alternatives. This part is suitable for applications requiring non-Microchip sourcing.

Packaging Considerations:

All substitute parts are available in 8-SOIC package matching the original form factor. Packaging options include Tape & Reel (TR), Cut Tape (CT) with Digi-Reel, and Tube formats. Selection should align with production assembly requirements and inventory management protocols.

Frequently Asked Questions (FAQ)

Q1: Can 24AA1025-I/SM directly replace AT24C1024BW-SH-T in existing designs?

The 24AA1025-I/SM maintains identical 1Mbit capacity, I2C interface, and 8-SOIC package. However, clock frequency is reduced from 1 MHz to 400 kHz, resulting in 900 ns access time versus 550 ns. This substitution is valid only if the application does not require 1 MHz I2C bus speed. The extended voltage range (1.7V to 5.5V) provides broader compatibility.

Q2: What is the difference between 24FC1025T-I/SM and 24AA1025-I/SM?

Both parts are 1Mbit I2C EEPROM in 8-SOIC package manufactured by Microchip Technology. The 24FC1025T-I/SM operates at 1 MHz with 400 ns access time, while 24AA1025-I/SM operates at 400 kHz with 900 ns access time. Selection depends on required I2C bus speed and access time performance. The 24FC series is suitable for high-speed applications; the 24AA series for reduced-speed or power-constrained applications.

Q3: Is CAT24M01XI-T2 compatible with AT24C1024BW-SH-T?

CAT24M01XI-T2 manufactured by onsemi maintains 1Mbit capacity, I2C interface, 1 MHz clock frequency, and 8-SOIC package. Access time is 400 ns, superior to the original 550 ns. Voltage supply range is 1.8V to 5.5V. This part is functionally compatible and suitable for cross-manufacturer sourcing strategies. Moisture sensitivity level is 3 (168 Hours) versus level 1 for Microchip parts.

Q4: What packaging options are available for substitute parts?

Substitute parts are available in three packaging formats: Tape & Reel (TR) for automated assembly, Cut Tape (CT) with Digi-Reel for flexible quantities, and Tube for manual handling. Selection should align with production volume, assembly equipment capabilities, and inventory management requirements.

Q5: Are all substitute parts RoHS3 compliant?

All substitute parts listed carry ROHS3 compliance certification. This ensures compatibility with RoHS3 regulatory requirements for lead-free manufacturing and restricted substance limitations.

Q6: Which substitute part offers the best programmability verification status?

24AA1025-I/SM, 24AA1025T-I/SM, 24FC1025T-I/SM, and CAT24M01XI-T2 carry verified programmability status. These parts have been tested and confirmed for programmable functionality. Parts with "Not Verified" status have not undergone this verification process but maintain functional compatibility based on electrical and mechanical specifications.

Q7: Can I use a 400 kHz part in a 1 MHz I2C bus application?

No. The 24AA series parts (400 kHz maximum) cannot operate reliably on a 1 MHz I2C bus. Clock frequency is a hard specification limit. For 1 MHz bus applications, use 24FC series or AT24CM01-SHM-T parts rated for 1 MHz operation.

Q8: What is the voltage supply compatibility range for substitutes?

The original AT24C1024BW-SH-T operates at 1.8V to 3.6V. Most substitute parts extend this range to 1.7V to 5.5V or 1.8V to 5.5V, providing broader application flexibility. Verify the specific application voltage requirements before selection.