AT24C1024B-TH-B EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The AT24C1024B-TH-B is a 1Mbit EEPROM memory IC manufactured by Microchip Technology, featuring I2C interface operation at 1 MHz with 8-TSSOP surface mount packaging. This part is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility across memory capacity, interface protocol, electrical specifications, and physical packaging to ensure direct replacement capability.

Key Parameters

Parameter	Value
Memory Size	1Mbit
Memory Organization	128K x 8
Memory Interface	I2C
Clock Frequency	1 MHz
Write Cycle Time	5ms
Package / Case	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 85°C (TA)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters: memory size (1Mbit), memory organization (128K x 8), memory interface (I2C), clock frequency (1 MHz), write cycle time (5ms), package type (8-TSSOP), mounting type (surface mount), and operating temperature range (-40°C ~ 85°C). All qualified substitute parts must match these specifications exactly. Variations in access time, supply voltage range, and MSL rating do not disqualify substitution but are noted for system-level design considerations. All substitute parts listed maintain ROHS3 compliance and active product status, ensuring long-term availability and regulatory alignment.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Memory Organization	Interface	Clock Frequency	Access Time	Write Cycle Time	Supply Voltage	Operating Temperature	Package	Product Status
AT24C1024B-TH-B	Microchip Technology	1Mbit	128K x 8	I2C	1 MHz	550 ns	5ms	1.8V ~ 3.6V	-40°C ~ 85°C	8-TSSOP	Obsolete
AT24CM01-XHM-B	Microchip Technology	1Mbit	128K x 8	I2C	1 MHz	550 ns	5ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
CAT24M01YI-GT3	onsemi	1Mbit	128K x 8	I2C	1 MHz	400 ns	5ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
CAT24M01YI-GT3JN	onsemi	1Mbit	128K x 8	I2C	1 MHz	400 ns	5ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
M24M01-DFDW6TP	STMicroelectronics	1Mbit	128K x 8	I2C	1 MHz	500 ns	5ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
M24M01-RDW6TP	STMicroelectronics	1Mbit	128K x 8	I2C	1 MHz	500 ns	5ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active

Engineering Selection Recommendations

All listed substitute parts are classified as active products with ROHS3 compliance, ensuring regulatory alignment and sustained manufacturing availability. The AT24CM01-XHM-B from Microchip Technology provides the closest functional match as a direct successor within the same manufacturer ecosystem, with extended supply voltage range (1.7V ~ 5.5V) compared to the original part. The onsemi CAT24M01 series (CAT24M01YI-GT3 and CAT24M01YI-GT3JN) offers improved access time performance (400 ns) and active product status with unlimited MSL rating. The STMicroelectronics M24M01 series (M24M01-DFDW6TP and M24M01-RDW6TP) provides the highest inventory availability and extended supply voltage compatibility (1.7V ~ 5.5V or 1.8V ~ 5.5V). Selection should prioritize active product status and supply voltage compatibility with target system requirements.

Frequently Asked Questions (FAQ)

Q: Can AT24CM01-XHM-B directly replace AT24C1024B-TH-B? A: Yes. Both parts share identical memory capacity (1Mbit), organization (128K x 8), I2C interface, 1 MHz clock frequency, 5ms write cycle time, and 8-TSSOP packaging. AT24CM01-XHM-B is active and offers extended supply voltage range (1.7V ~ 5.5V). Verify system supply voltage compatibility before implementation.

Q: What is the difference between CAT24M01YI-GT3 and CAT24M01YI-GT3JN? A: Both parts are functionally equivalent with identical electrical specifications. The primary difference is packaging format: CAT24M01YI-GT3 is supplied in Cut Tape (CT) & Digi-Reel format, while CAT24M01YI-GT3JN is supplied in Tape & Reel (TR) format. Select based on assembly line requirements.

Q: Are STMicroelectronics M24M01 parts compatible with the original AT24C1024B-TH-B? A: Yes. M24M01-DFDW6TP and M24M01-RDW6TP maintain all critical functional parameters: 1Mbit capacity, 128K x 8 organization, I2C interface, 1 MHz operation, 5ms write cycle, and 8-TSSOP packaging. Access time is 500 ns (compared to 550 ns original), which is a performance improvement. Both parts are active with high inventory availability.

Q: What supply voltage range should I select? A: The original AT24C1024B-TH-B operates at 1.8V ~ 3.6V. Substitute parts offer extended ranges: AT24CM01-XHM-B (1.7V ~ 5.5V), CAT24M01 series (1.8V ~ 5.5V), and M24M01 series (1.7V ~ 5.5V or 1.8V ~ 5.5V). Select based on your system's actual supply voltage to ensure compatibility.

Q: Does MSL rating affect substitution? A: MSL rating indicates moisture sensitivity during storage and handling. The original part has MSL 1 (unlimited), while AT24CM01-XHM-B has MSL 3 (168 hours). All substitute parts except AT24CM01-XHM-B have MSL 1. For high-humidity environments or extended storage, prioritize MSL 1 rated parts.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance, ensuring regulatory alignment with current environmental standards.

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