24FC64T-I/ST EEPROM 64Kbit I2C Memory IC Equivalent & Substitute Parts

Part Overview

The 24FC64T-I/ST is a 64Kbit EEPROM memory IC manufactured by Microchip Technology, featuring I2C interface with 1 MHz clock frequency and 400 ns access time. This non-volatile memory device is packaged in 8-TSSOP surface mount configuration and operates across a supply voltage range of 1.7V to 5.5V with temperature range of -40°C to 85°C. The part is ROHS3 compliant and currently active in production. Equivalent and substitute parts are identified based on matching memory capacity, interface protocol, package type, and electrical operating parameters to ensure functional interchangeability in circuit applications.

Key Parameters

Parameter	24FC64T-I/ST
Memory Size	64Kbit
Memory Organization	8K x 8
Memory Interface	I2C
Clock Frequency	1 MHz
Access Time	400 ns
Write Cycle Time	5ms
Voltage Supply Range	1.7V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-TSSOP
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the 24FC64T-I/ST is determined by the following critical parameters: 64Kbit memory capacity, 8K x 8 organization, I2C interface protocol, 8-TSSOP package, surface mount configuration, and compliance with ROHS3 standards. Parts are grouped into two categories based on clock frequency performance:

Category 1: 1 MHz Clock Frequency Parts — Direct functional equivalents operating at the same 1 MHz I2C clock speed with matching or superior access time specifications. These parts maintain identical timing characteristics and are fully interchangeable in applications requiring high-speed I2C communication.

Category 2: 400 kHz Clock Frequency Parts — Substitute parts operating at reduced I2C clock frequency. These parts are compatible in applications where lower I2C bus speed is acceptable and provide alternative sourcing options.

All substitute parts maintain the same 64Kbit capacity, 8-TSSOP package footprint, surface mount configuration, and ROHS3 compliance. Voltage supply ranges and operating temperature specifications are verified for each substitute to ensure compatibility with the original design requirements.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temperature	Package	Product Status
24FC64T-I/ST	Microchip Technology	64Kbit	1 MHz	400 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
CAT24C64YI-GT3	onsemi	64Kbit	1 MHz	400 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
AT24C64D-XHM-T	Microchip Technology	64Kbit	1 MHz	550 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
M24C64-FDW6TP	STMicroelectronics	64Kbit	1 MHz	450 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
M24C64-DRDW8TP/K	STMicroelectronics	64Kbit	1 MHz	450 ns	1.8V ~ 5.5V	-40°C ~ 105°C	8-TSSOP	Active
BR24G64FVT-3AGE2	Rohm Semiconductor	64Kbit	1 MHz	Not Specified	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active
24AA64T-I/ST	Microchip Technology	64Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
BR24G64FVT-3GE2	Rohm Semiconductor	64Kbit	400 kHz	Not Specified	1.6V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active
BR24S64FVT-WE2	Rohm Semiconductor	64Kbit	400 kHz	Not Specified	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active
CAV24C64YE-GT3	onsemi	64Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active

Engineering Selection Recommendations

Direct Equivalents (1 MHz, Identical Specifications):

CAT24C64YI-GT3 from onsemi provides parametric equivalence to the 24FC64T-I/ST with matching 1 MHz clock frequency, 400 ns access time, and identical voltage and temperature operating ranges. Both parts are ROHS3 compliant and active in production status.

High-Performance Alternatives (1 MHz, Extended Temperature):

M24C64-DRDW8TP/K from STMicroelectronics operates at 1 MHz with extended operating temperature range to 105°C and includes AEC-Q100 automotive qualification. This part is suitable for applications requiring automotive-grade reliability while maintaining 1 MHz I2C performance.

Standard Alternatives (1 MHz, Compatible Timing):

AT24C64D-XHM-T and M24C64-FDW6TP both operate at 1 MHz with access times of 550 ns and 450 ns respectively, providing functional compatibility with slightly relaxed timing specifications. Both maintain the 1.7V to 5.5V supply range and -40°C to 85°C operating temperature.

Lower-Speed Substitutes (400 kHz):

24AA64T-I/ST, BR24G64FVT-3GE2, BR24S64FVT-WE2, and CAV24C64YE-GT3 operate at 400 kHz I2C frequency. These parts are suitable for applications where reduced I2C bus speed is acceptable. CAV24C64YE-GT3 includes AEC-Q100 automotive qualification and extended temperature range to 125°C.

All substitute parts maintain ROHS3 compliance and active production status, ensuring long-term availability and supply chain reliability.

Frequently Asked Questions (FAQ)

Q: Can I use a 400 kHz substitute part in place of the 24FC64T-I/ST?

A: Yes, if your application design permits operation at reduced I2C clock frequency. The 400 kHz parts (24AA64T-I/ST, BR24G64FVT-3GE2, BR24S64FVT-WE2, CAV24C64YE-GT3) are functionally compatible with identical memory capacity and organization. However, I2C communication will operate at lower speed, which may affect system timing requirements.

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

A: Both packages are physically compatible with 0.173" width and 4.40mm dimensions, suitable for the same PCB footprint. The 8-TSSOP-B designation indicates a variant package from Rohm Semiconductor. Verify with your PCB layout and assembly specifications before substitution.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all listed substitute parts are ROHS3 compliant, matching the compliance status of the 24FC64T-I/ST.

Q: Which substitute offers the best performance match?

A: CAT24C64YI-GT3 provides the closest parametric match with identical 1 MHz clock frequency, 400 ns access time, and matching voltage and temperature specifications.

Q: Can I use M24C64-DRDW8TP/K in automotive applications?

A: Yes, M24C64-DRDW8TP/K carries AEC-Q100 automotive qualification and extended operating temperature to 105°C, making it suitable for automotive-grade designs.

Q: What is the minimum supply voltage for each substitute?

A: Most parts operate from 1.7V minimum. BR24G64FVT-3GE2 operates from 1.6V minimum, while CAV24C64YE-GT3 requires 2.5V minimum. Verify compatibility with your power supply design.

Q: Are all substitute parts currently in production?

A: Yes, all listed substitute parts have active product status and are in current production.

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