AT24C1024BN-SH-T Equivalent & Substitute Parts

Part Overview

The AT24C1024BN-SH-T is a 1Mbit EEPROM memory IC manufactured by Microchip Technology, featuring I2C interface with 1 MHz clock frequency and 8-SOIC surface mount packaging. This part is currently listed as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity. The device provides 128K x 8 memory organization with 550 ns access time and operates across 1.8V to 3.6V supply voltage range.

Key Parameters

Parameter	Value
Memory Size	1Mbit
Memory Organization	128K x 8
Memory Interface	I2C
Clock Frequency	1 MHz
Access Time	550 ns
Write Cycle Time	5ms
Voltage Supply Range	1.8V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package Type	8-SOIC
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the AT24C1024BN-SH-T is determined by the following critical parameters:

Memory capacity: 1Mbit (128K x 8 organization)
Interface protocol: I2C
Package: 8-SOIC form factor
Operating temperature range: -40°C ~ 85°C
Supply voltage compatibility: Parts must support the original 1.8V minimum requirement

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

Category 1: 1 MHz Clock Frequency (Direct Performance Match) Parts operating at 1 MHz provide equivalent or superior speed performance to the original AT24C1024BN-SH-T. These include 24FC1025T-I/SN, 24FC1026-I/SN, 24FC1026T-I/SN, AT24CM01-SSHM-T, BR24G1MFJ-3AGTE2, and CAT24M01WI-GT3.

Category 2: 400 kHz Clock Frequency (Reduced Speed) Parts operating at 400 kHz (24AA1025-I/SN, 24AA1025T-I/SN, 24AA1026-I/SN, 24AA1026T-I/SN) provide functional equivalence but with reduced I2C bus speed. These are suitable for applications where lower clock frequency is acceptable.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Package	Product Status
AT24C1024BN-SH-T	Microchip Technology	1Mbit	1 MHz	550 ns	1.8V ~ 3.6V	8-SOIC	Obsolete
24AA1025-I/SN	Microchip Technology	1Mbit	400 kHz	900 ns	1.7V ~ 5.5V	8-SOIC	Active
24AA1025T-I/SN	Microchip Technology	1Mbit	400 kHz	900 ns	1.7V ~ 5.5V	8-SOIC	Active
24AA1026-I/SN	Microchip Technology	1Mbit	400 kHz	900 ns	1.7V ~ 5.5V	8-SOIC	Active
24AA1026T-I/SN	Microchip Technology	1Mbit	400 kHz	900 ns	1.7V ~ 5.5V	8-SOIC	Active
24FC1025T-I/SN	Microchip Technology	1Mbit	1 MHz	400 ns	1.8V ~ 5.5V	8-SOIC	Active
24FC1026-I/SN	Microchip Technology	1Mbit	1 MHz	400 ns	1.8V ~ 5.5V	8-SOIC	Active
24FC1026T-I/SN	Microchip Technology	1Mbit	1 MHz	400 ns	1.8V ~ 5.5V	8-SOIC	Active
AT24CM01-SSHM-T	Microchip Technology	1Mbit	1 MHz	550 ns	1.7V ~ 5.5V	8-SOIC	Active
BR24G1MFJ-3AGTE2	Rohm Semiconductor	1Mbit	1 MHz	Not specified	1.7V ~ 5.5V	8-SOIC	Active
CAT24M01WI-GT3	onsemi	1Mbit	1 MHz	400 ns	1.8V ~ 5.5V	8-SOIC	Active

Engineering Selection Recommendations

Primary Recommendation: AT24CM01-SSHM-T This Microchip Technology part provides the closest electrical match to the AT24C1024BN-SH-T with identical 1 MHz clock frequency and 550 ns access time. It maintains ROHS3 compliance and is verified for DiGi-Electronics programmability. The extended supply voltage range (1.7V ~ 5.5V) provides broader system compatibility while maintaining the original 1.8V minimum requirement.

Secondary Recommendation: 24FC1026T-I/SN This active Microchip part operates at 1 MHz with superior 400 ns access time and maintains ROHS3 compliance. It offers the highest inventory availability (10,000 pcs) and is suitable for applications where faster access time is beneficial. Supply voltage range extends to 5.5V maximum.

Alternative Recommendation: CAT24M01WI-GT3 This onsemi part provides 1 MHz operation with 400 ns access time and verified DiGi-Electronics programmability. It represents a cross-manufacturer option with active product status and ROHS3 compliance.

Lower-Speed Alternative: 24AA1025T-I/SN or 24AA1026T-I/SN These Microchip parts operate at 400 kHz and are suitable only for applications where reduced I2C bus speed is acceptable. Both maintain ROHS3 compliance and active product status with extended supply voltage range (1.7V ~ 5.5V).

Frequently Asked Questions (FAQ)

Q: Can I use a 400 kHz part as a direct replacement for the 1 MHz AT24C1024BN-SH-T? A: Functional substitution is possible only if your system I2C bus is configured to operate at 400 kHz or lower. The 24AA1025 and 24AA1026 series parts will not operate at 1 MHz clock frequency. System timing and communication protocols must be verified for compatibility.

Q: What is the difference between 24FC1026-I/SN and 24FC1026T-I/SN? A: Both parts are electrically identical with 1 MHz clock frequency and 400 ns access time. The primary difference is packaging: 24FC1026-I/SN is supplied in Tube packaging, while 24FC1026T-I/SN is supplied in Cut Tape (CT) & Digi-Reel format. Select based on your procurement and assembly requirements.

Q: Is the BR24G1MFJ-3AGTE2 from Rohm Semiconductor a suitable substitute? A: Yes, the BR24G1MFJ-3AGTE2 provides 1 MHz I2C operation with 1Mbit capacity in 8-SOIC packaging. It maintains ROHS3 compliance and active product status. The primary consideration is cross-manufacturer qualification requirements for your specific application.

Q: Why does AT24CM01-SSHM-T have a higher MSL rating (3) compared to the original part (1)? A: The AT24CM01-SSHM-T has MSL 3 (168 Hours) versus MSL 1 (Unlimited) for the original. This indicates moisture sensitivity requirements during storage and handling. Verify your manufacturing process can accommodate the 168-hour moisture exposure limit if this part is selected.

Q: Can I substitute parts with different supply voltage ranges? A: The original AT24C1024BN-SH-T operates at 1.8V ~ 3.6V. Substitute parts with extended ranges (1.7V ~ 5.5V) are backward compatible with the original voltage specification. Verify your system power supply and signal levels remain within the original 1.8V ~ 3.6V range if using the original design parameters.

Q: What is the significance of DiGi-Electronics Programmable verification? A: Parts marked as "Verified" (AT24CM01-SSHM-T, CAT24M01WI-GT3) have been tested and confirmed for programmability through DiGi-Electronics services. Parts marked "Not Verified" have not undergone this specific testing. This is relevant only if you require DiGi-Electronics programming services.

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