AT24C1024BW-SH-B Equivalent & Substitute Parts

Part Overview

The AT24C1024BW-SH-B is a 1Mbit EEPROM memory IC manufactured by Microchip Technology, featuring I2C interface operation at 1 MHz with 550 ns access time in 8-SOIC surface mount packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts maintain core functional parameters while offering active product status and expanded availability.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile EEPROM
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 / Case	8-SOIC (0.209", 5.30mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution logic for the AT24C1024BW-SH-B is based on the following critical parameters:

Memory capacity (1Mbit) and organization (128K x 8)
I2C interface protocol
Operating voltage range compatibility
Operating temperature range (-40°C ~ 85°C)
8-SOIC package footprint
Surface mount technology

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

Category 1: 1 MHz Operation (Direct Performance Match) Parts maintaining 1 MHz clock frequency with improved or equivalent access time specifications. These provide direct functional equivalence to the AT24C1024BW-SH-B.

Category 2: 400 kHz Operation (Reduced Speed) Parts operating at 400 kHz clock frequency. These are suitable for applications where lower I2C bus speed is acceptable and provide broader voltage supply range compatibility.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Package	Product Status	Inventory
AT24C1024BW-SH-B	Microchip Technology	1Mbit	1 MHz	550 ns	1.8V ~ 3.6V	8-SOIC	Obsolete	4079 Pcs
24FC1025-I/SM	Microchip Technology	1Mbit	1 MHz	400 ns	1.8V ~ 5.5V	8-SOIJ	Active	4480 Pcs
24FC1026-I/SM	Microchip Technology	1Mbit	1 MHz	400 ns	1.8V ~ 5.5V	8-SOIJ	Active	687 Pcs
AT24CM01-SHM-B	Microchip Technology	1Mbit	1 MHz	550 ns	1.7V ~ 5.5V	8-SOIC	Active	1733 Pcs
CAT24M01XI-T2	onsemi	1Mbit	1 MHz	400 ns	1.8V ~ 5.5V	8-SOIC	Active	1788 Pcs
24AA1025-I/SM	Microchip Technology	1Mbit	400 kHz	900 ns	1.7V ~ 5.5V	8-SOIJ	Active	5599 Pcs
24AA1026-I/SM	Microchip Technology	1Mbit	400 kHz	900 ns	1.7V ~ 5.5V	8-SOIJ	Active	3400 Pcs

Engineering Selection Recommendations

For Direct Replacement (1 MHz Operation):

The AT24CM01-SHM-B is the primary active substitute, offering identical 1 MHz clock frequency and 550 ns access time with expanded voltage supply range (1.7V ~ 5.5V) and active product status. This part maintains the 8-SOIC package format and is ROHS3 compliant with unlimited MSL rating.

The 24FC1025-I/SM and 24FC1026-I/SM provide 1 MHz operation with improved 400 ns access time, expanded voltage compatibility, and active status. Both are ROHS3 compliant. The 24FC1025-I/SM has higher inventory availability (4480 Pcs).

The CAT24M01XI-T2 (onsemi) offers 1 MHz operation with 400 ns access time in 8-SOIC package, maintaining footprint compatibility. This part is ROHS3 compliant with active status and verified programmability. MSL rating is 3 (168 Hours).

For Reduced-Speed Applications (400 kHz Operation):

The 24AA1025-I/SM and 24AA1026-I/SM operate at 400 kHz with expanded voltage supply range (1.7V ~ 5.5V) and active product status. Both are ROHS3 compliant with unlimited MSL rating. The 24AA1025-I/SM has higher inventory (5599 Pcs) and verified programmability.

All substitute parts maintain 1Mbit capacity, 128K x 8 organization, I2C interface, 5ms write cycle time, -40°C ~ 85°C operating temperature, and surface mount technology.

Frequently Asked Questions (FAQ)

Q: Can the 24AA1025-I/SM or 24AA1026-I/SM replace the AT24C1024BW-SH-B directly?

A: These parts are functionally compatible for I2C EEPROM applications requiring 1Mbit capacity. However, they operate at 400 kHz instead of 1 MHz, resulting in slower I2C bus speed and 900 ns access time versus 550 ns. They are suitable only if the application does not require 1 MHz operation. Voltage supply range is expanded (1.7V ~ 5.5V).

Q: What is the difference between 24FC1025-I/SM and 24FC1026-I/SM?

A: Both parts are functionally identical, offering 1 MHz operation, 400 ns access time, 1Mbit capacity, and 8-SOIJ package. The primary difference is inventory availability (24FC1025-I/SM: 4480 Pcs; 24FC1026-I/SM: 687 Pcs) and base product number designation.

Q: Is the CAT24M01XI-T2 package compatible with the AT24C1024BW-SH-B?

A: Yes. Both use 8-SOIC (0.209", 5.30mm Width) surface mount packaging, providing identical PCB footprint compatibility. The CAT24M01XI-T2 is manufactured by onsemi and offers 1 MHz operation with 400 ns access time.

Q: What is the voltage supply range limitation for the AT24C1024BW-SH-B?

A: The AT24C1024BW-SH-B operates within 1.8V ~ 3.6V. Most substitute parts expand this range to 1.7V ~ 5.5V or 1.8V ~ 5.5V, providing greater design flexibility for multi-voltage systems.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, matching the environmental compliance of the AT24C1024BW-SH-B.

Q: What does MSL rating mean for these parts?

A: MSL (Moisture Sensitivity Level) indicates the maximum time a component can be exposed to moisture before soldering. The AT24C1024BW-SH-B and most substitutes have MSL 1 (Unlimited), except CAT24M01XI-T2 which has MSL 3 (168 Hours maximum exposure).

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