AT24C1024B-TH-T Equivalent & Substitute Parts

Part Overview

The AT24C1024B-TH-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-TSSOP surface mount package. This part is currently obsolete, necessitating identification of active equivalent alternatives that maintain functional and electrical compatibility for new designs and production continuity.

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 validity is determined by strict equivalence across the following critical parameters: memory size (1Mbit), memory organization (128K x 8), I2C interface protocol, 1 MHz clock frequency, 5ms write cycle time, 8-TSSOP package geometry, surface mount mounting type, and -40°C to 85°C operating temperature range. All listed substitute parts meet these core requirements. Voltage supply ranges and access times vary among substitutes but remain within acceptable operational margins for I2C EEPROM applications. All substitutes maintain ROHS3 compliance and MSL Level 1 moisture sensitivity rating.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Memory Organization	Interface	Clock Frequency	Access Time	Write Cycle Time	Voltage Supply	Operating Temperature	Package	Product Status
AT24C1024B-TH-T	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-T	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 substitute parts listed are active production components with ROHS3 compliance and EAR99 or equivalent export classification. AT24CM01-XHM-T maintains Microchip Technology manufacturer continuity with extended voltage supply range (1.7V ~ 5.5V) and identical access time specification. CAT24M01YI-GT3 and CAT24M01YI-GT3JN from onsemi offer improved access time performance (400 ns) with broader voltage compatibility. M24M01-DFDW6TP and M24M01-RDW6TP from STMicroelectronics provide high inventory availability with extended voltage supply ranges. Selection should prioritize active product status and compliance certifications appropriate to target application requirements.

Frequently Asked Questions (FAQ)

Q: Can AT24CM01-XHM-T directly replace AT24C1024B-TH-T in existing designs? 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 package. AT24CM01-XHM-T extends voltage supply range to 1.7V ~ 5.5V, providing broader operational compatibility.

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.

Q: Are STMicroelectronics M24M01 variants compatible with the original AT24C1024B-TH-T? A: Yes. M24M01-DFDW6TP and M24M01-RDW6TP maintain full functional compatibility with identical memory specifications, I2C protocol, and 8-TSSOP package. Access time is 500 ns, which is within acceptable operational parameters for I2C EEPROM applications.

Q: What voltage supply range should be considered for new designs? A: For maximum design flexibility, AT24CM01-XHM-T, M24M01-DFDW6TP, and M24M01-RDW6TP support 1.7V ~ 5.5V supply range. CAT24M01 variants support 1.8V ~ 5.5V. All parts maintain -40°C to 85°C operating temperature specification.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL Level 1 moisture sensitivity rating, consistent with the original AT24C1024B-TH-T specification.

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