24AA64T-I/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 24AA64T-I/ST is a 64Kbit I2C EEPROM memory IC manufactured by Microchip Technology, supplied in 8-TSSOP surface mount packaging. This non-volatile memory device operates at 400 kHz I2C clock frequency with 900 ns access time and supports a supply voltage range of 1.7V to 5.5V across an operating temperature range of -40°C to 85°C. The part is ROHS3 compliant and carries an MSL rating of 1 (Unlimited). Equivalent and substitute parts are identified based on matching core electrical specifications and mechanical compatibility within the 64Kbit EEPROM I2C category.

Key Parameters

Parameter	24AA64T-I/ST Value
Memory Size	64Kbit
Memory Organization	8K x 8
Memory Interface	I2C
Clock Frequency	400 kHz
Access Time	900 ns
Write Cycle Time	5ms
Voltage Supply Range	1.7V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-TSSOP
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 24AA64T-I/ST is determined by the following core parameters:

Critical Matching Parameters:

Memory Size: 64Kbit (non-negotiable)
Memory Organization: 8K x 8 (non-negotiable)
Memory Interface: I2C (non-negotiable)
Package Type: 8-TSSOP (mechanical compatibility required)
Voltage Supply Range: Must encompass or match 1.7V ~ 5.5V minimum
Operating Temperature: Must support -40°C ~ 85°C minimum range
RoHS Compliance: ROHS3 Compliant (regulatory requirement)

Performance Parameters (Allowable Variations):

Clock Frequency: 400 kHz or higher (backward compatible)
Access Time: 900 ns or faster (performance improvement acceptable)
Write Cycle Time: 5ms or faster (performance improvement acceptable)

Substitute parts are grouped into two categories: direct equivalents matching all specifications, and higher-performance variants with improved clock frequency and access time characteristics while maintaining full electrical and mechanical compatibility.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Write Cycle Time	Voltage Supply	Operating Temp	Package	RoHS Status
24AA64T-I/ST	Microchip Technology	64Kbit	400 kHz	900 ns	5ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	ROHS3
24AA64-I/ST	Microchip Technology	64Kbit	400 kHz	900 ns	5ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	ROHS3
24FC64F-I/ST	Microchip Technology	64Kbit	1 MHz	400 ns	5ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	ROHS3
AT24C64D-XHM-T	Microchip Technology	64Kbit	1 MHz	550 ns	5ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	ROHS3
BR24G64FVT-3AGE2	Rohm Semiconductor	64Kbit	1 MHz	Not Specified	5ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	ROHS3
BR24G64FVT-3GE2	Rohm Semiconductor	64Kbit	400 kHz	Not Specified	5ms	1.6V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	ROHS3
BR24S64FVT-WE2	ROHM Semiconductor	64Kbit	400 kHz	Not Specified	5ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	ROHS3
CAT24C64YI-GT3	onsemi	64Kbit	1 MHz	400 ns	5ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	ROHS3
M24C64-DRDW8TP/K	STMicroelectronics	64Kbit	1 MHz	450 ns	4ms	1.8V ~ 5.5V	-40°C ~ 105°C	8-TSSOP	ROHS3
M24C64-FDW6TP	STMicroelectronics	64Kbit	1 MHz	450 ns	5ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	ROHS3
M24C64-RDW6TP	STMicroelectronics	64Kbit	1 MHz	450 ns	5ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	ROHS3

Engineering Selection Recommendations

Direct Equivalent (Identical Specifications): The 24AA64-I/ST is a direct equivalent to the 24AA64T-I/ST, differing only in packaging format (Tube vs. Cut Tape & Digi-Reel). Both parts are manufactured by Microchip Technology with identical electrical specifications and are ROHS3 compliant with verified programmability status.

Higher-Performance Substitutes (1 MHz I2C Operation): The 24FC64F-I/ST, AT24C64D-XHM-T, CAT24C64YI-GT3, M24C64-FDW6TP, and M24C64-RDW6TP operate at 1 MHz I2C clock frequency with improved access times (400–550 ns), providing backward compatibility with 400 kHz I2C systems while enabling faster data transfer when supported by the host controller. All maintain the 1.7V–5.5V supply voltage range and -40°C to 85°C operating temperature requirements.

Rohm Semiconductor Alternatives: The BR24G64FVT-3GE2 and BR24S64FVT-WE2 provide 400 kHz I2C operation matching the main part's clock frequency. The BR24G64FVT-3AGE2 offers 1 MHz operation. All Rohm parts use the 8-TSSOP-B package variant and are ROHS3 compliant. The BR24G64FVT-3GE2 specifies a minimum supply voltage of 1.6V, which is compatible with the 1.7V minimum of the main part.

Automotive-Grade Option: The M24C64-DRDW8TP/K from STMicroelectronics is qualified to AEC-Q100 automotive standards with an extended operating temperature range of -40°C to 105°C and operates at 1 MHz with 450 ns access time. Supply voltage range is 1.8V–5.5V.

All substitute parts maintain ROHS3 compliance and MSL rating of 1 (Unlimited), ensuring regulatory and moisture sensitivity compatibility with the original specification.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 24AA64T-I/ST with a 1 MHz I2C variant like the 24FC64F-I/ST?

A: Yes. The 24FC64F-I/ST is electrically compatible and operates at a higher I2C clock frequency (1 MHz vs. 400 kHz). It will function in any circuit designed for the 24AA64T-I/ST. The host I2C controller will operate at the lower speed if it does not support 1 MHz operation, ensuring backward compatibility.

Q: What is the difference between 8-TSSOP and 8-TSSOP-B packages?

A: Both are 8-pin thin shrink small outline packages with identical pin pitch (0.65mm) and body dimensions (0.173" width, 4.40mm). The "-B" designation indicates a variant from Rohm Semiconductor. Pin-to-pin compatibility is maintained for I2C EEPROM applications.

Q: Are Rohm Semiconductor BR24 series parts direct replacements?

A: The BR24G64FVT-3GE2 and BR24S64FVT-WE2 match the 400 kHz clock frequency and electrical specifications of the 24AA64T-I/ST. The BR24G64FVT-3AGE2 operates at 1 MHz. All three are pin-compatible in 8-TSSOP-B packages and ROHS3 compliant. Verify package footprint compatibility with your PCB design.

Q: Which substitute offers the best performance improvement?

A: The 24FC64F-I/ST and CAT24C64YI-GT3 provide the fastest access time (400 ns) combined with 1 MHz I2C operation. The M24C64-DRDW8TP/K offers the widest operating temperature range (-40°C to 105°C) for automotive applications.

Q: Is the M24C64-DRDW8TP/K suitable for consumer applications?

A: The M24C64-DRDW8TP/K is qualified to AEC-Q100 automotive standards and operates across -40°C to 105°C. It is suitable for any application within this temperature range, including consumer applications requiring extended temperature performance. The automotive qualification ensures higher reliability standards.

Q: What is the minimum supply voltage compatibility?

A: The 24AA64T-I/ST specifies 1.7V minimum. Most substitutes (24FC64F-I/ST, AT24C64D-XHM-T, BR24S64FVT-WE2, CAT24C64YI-GT3, M24C64-FDW6TP) maintain this 1.7V minimum. The BR24G64FVT-3GE2 specifies 1.6V minimum, and M24C64-DRDW8TP/K and M24C64-RDW6TP specify 1.8V minimum. Verify your circuit's supply voltage against the selected substitute's minimum rating.

Q: Are all listed substitutes ROHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance status, matching the regulatory requirement of the 24AA64T-I/ST.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message