FT24C64A-UTG-T EEPROM 64Kbit I2C Equivalent & Substitute Parts

Part Overview

The FT24C64A-UTG-T is a 64Kbit EEPROM memory IC with I2C interface manufactured by Fremont Micro Devices Ltd in 8-TSSOP surface mount packaging. This part is discontinued at DiGi Electronics. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for production and maintenance applications.

Key Parameters

Parameter	FT24C64A-UTG-T
Memory Size	64Kbit
Memory Organization	8K x 8
Memory Interface	I2C
Clock Frequency	800 kHz
Access Time	700 ns
Write Cycle Time	5ms
Voltage Supply Range	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package / Case	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the FT24C64A-UTG-T is determined by the following critical parameters:

Core Compatibility Requirements:

Memory Size: 64Kbit
Memory Organization: 8K x 8
Memory Interface: I2C
Package / Case: 8-TSSOP (0.173", 4.40mm Width)
Mounting Type: Surface Mount
Voltage Supply Range: Must encompass or be compatible with 1.8V ~ 5.5V
Operating Temperature: Must support -40°C ~ 85°C minimum
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

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

Category A - Standard Speed (400 kHz): 24AA64-E/ST, 24AA64F-I/ST, 24AA64FT-I/ST, 24AA64T-E/ST, 24AA64T-I/ST, AT24C64B-10TU-1.8

Category B - High Speed (1 MHz): 24FC64-I/ST, 24FC64F-I/ST, 24FC64FT-I/ST, 24FC64T-I/ST

All substitute parts maintain identical memory capacity, organization, interface protocol, package dimensions, and compliance certifications. Differences exist in clock frequency, access time, and voltage supply floor specifications.

Parameter Comparison

Parameter	FT24C64A-UTG-T	24AA64-E/ST	24AA64T-I/ST	24FC64-I/ST	24FC64T-I/ST	AT24C64B-10TU-1.8
Memory Size	64Kbit	64Kbit	64Kbit	64Kbit	64Kbit	64Kbit
Memory Organization	8K x 8	8K x 8	8K x 8	8K x 8	8K x 8	8K x 8
Memory Interface	I2C	I2C	I2C	I2C	I2C	I2C
Clock Frequency	800 kHz	400 kHz	400 kHz	1 MHz	1 MHz	400 kHz
Access Time	700 ns	900 ns	900 ns	400 ns	400 ns	900 ns
Write Cycle Time	5ms	5ms	5ms	5ms	5ms	5ms
Voltage Supply Range	1.8V ~ 5.5V	1.7V ~ 5.5V	1.7V ~ 5.5V	1.7V ~ 5.5V	1.7V ~ 5.5V	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	8-TSSOP	8-TSSOP	8-TSSOP	8-TSSOP	8-TSSOP	8-TSSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)
Product Status	Discontinued	Active	Active	Active	Active	Active
Manufacturer	Fremont Micro Devices Ltd	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology

Engineering Selection Recommendations

For Direct Replacement (Minimum Performance Requirement):

Select 24FC64-I/ST, 24FC64F-I/ST, 24FC64FT-I/ST, or 24FC64T-I/ST when the application requires clock frequency performance equal to or exceeding the original 800 kHz specification. These parts operate at 1 MHz with 400 ns access time, providing superior performance margin. All are manufactured by Microchip Technology with active product status and full ROHS3 compliance.

For Standard Speed Applications:

Select 24AA64T-I/ST or AT24C64B-10TU-1.8 when 400 kHz clock frequency is acceptable. The 24AA64T-I/ST offers unlimited moisture sensitivity (MSL 1) and extended operating temperature range to -40°C ~ 85°C. The AT24C64B-10TU-1.8 matches the original voltage supply floor of 1.8V but carries MSL 3 moisture sensitivity rating.

Packaging Considerations:

24AA64-E/ST, 24AA64F-I/ST, 24FC64-I/ST, and 24FC64F-I/ST are supplied in Tube packaging. 24AA64FT-I/ST, 24AA64T-E/ST, 24AA64T-I/ST, 24FC64FT-I/ST, and 24FC64T-I/ST are supplied in Tape & Reel (TR) or Cut Tape (CT) & Digi-Reel® packaging for automated assembly.

All substitute parts maintain ROHS3 compliance and REACH unaffected status. All are classified under ECCN EAR99 and HTSUS 8542.32.0051.

Frequently Asked Questions (FAQ)

Q: Can I use a 400 kHz substitute part in place of the FT24C64A-UTG-T which operates at 800 kHz?

A: Yes. The 400 kHz parts (24AA64 series and AT24C64B-10TU-1.8) are electrically compatible. I2C bus speed is determined by the master controller, not the slave device. The substitute parts will operate correctly on an 800 kHz I2C bus, though they are rated for 400 kHz maximum. Verify your system master controller specifications.

Q: What is the difference between 24AA64-E/ST and 24AA64T-I/ST?

A: Both are 64Kbit I2C EEPROM devices with identical electrical specifications. The primary differences are packaging format (Tube vs. Tape & Reel) and operating temperature range. 24AA64-E/ST supports -40°C ~ 125°C; 24AA64T-I/ST supports -40°C ~ 85°C. Select based on your assembly process requirements and temperature environment.

Q: Why does AT24C64B-10TU-1.8 have MSL 3 while other substitutes have MSL 1?

A: Moisture Sensitivity Level (MSL) is determined by the manufacturer's design and manufacturing process. MSL 3 requires storage in dry conditions (168 hours maximum at 60% relative humidity before reflow). MSL 1 has unlimited shelf life. For applications with extended storage or humid environments, select MSL 1 parts (24AA64 or 24FC64 series).

Q: Can I substitute the high-speed 24FC64 series for the original FT24C64A-UTG-T?

A: Yes. The 24FC64 series (1 MHz, 400 ns access time) is a direct functional upgrade. All electrical parameters, package dimensions, and compliance certifications are compatible. The higher clock frequency and faster access time provide performance margin without compromising compatibility.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, matching the original FT24C64A-UTG-T compliance status.

Q: What is the minimum voltage supply requirement for substitute parts?

A: The original FT24C64A-UTG-T operates from 1.8V minimum. Most substitute parts (24AA64 and 24FC64 series) operate from 1.7V minimum, providing additional margin. AT24C64B-10TU-1.8 matches the 1.8V minimum specification. All support 5.5V maximum.

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