FT24C64A-UTR-B EEPROM 64Kbit I2C Equivalent & Substitute Parts

Part Overview

The FT24C64A-UTR-B is a 64Kbit EEPROM memory IC with I2C interface manufactured by Fremont Micro Devices Ltd in 8-TSSOP surface mount packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The device operates across a supply voltage range of 1.8V to 5.5V with an 800 kHz I2C clock frequency and 700 ns access time, serving applications requiring non-volatile serial memory storage.

Key Parameters

Parameter	FT24C64A-UTR-B
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
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the FT24C64A-UTR-B is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

Memory capacity: 64Kbit
Memory organization: 8K x 8
Interface protocol: I2C
Package type: 8-TSSOP with 0.173" width and 4.40mm width dimensions
Supply voltage range: Must encompass or overlap 1.8V ~ 5.5V
Operating temperature range: Must support -40°C ~ 85°C minimum
Write cycle time: 5ms
Mounting type: Surface mount

Performance Variation Parameters: Clock frequency and access time may vary among substitutes. The FT24C64A-UTR-B operates at 800 kHz with 700 ns access time. Substitute parts with equal or higher clock frequencies and equal or faster access times maintain or improve performance characteristics. Parts with lower clock frequencies or slower access times represent functional alternatives where system timing permits.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temp	Package	Product Status
FT24C64A-UTR-B	Fremont Micro Devices Ltd	64Kbit	800 kHz	700 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Obsolete
24AA64-E/ST	Microchip Technology	64Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
24AA64-I/ST	Microchip Technology	64Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA64F-I/ST	Microchip Technology	64Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24FC64-I/ST	Microchip Technology	64Kbit	1 MHz	400 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24FC64F-I/ST	Microchip Technology	64Kbit	1 MHz	400 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
AT24C64B-10TU-1.8	Microchip Technology	64Kbit	400 kHz	900 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
AT24C64D-XHM-B	Microchip Technology	64Kbit	1 MHz	550 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
AT24CS64-XHM-T	Microchip Technology	64Kbit	1 MHz	550 ns	1.7V ~ 5.5V	-40°C ~ 85°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
BR24G64FVT-3GE2	Rohm Semiconductor	64Kbit	400 kHz	Not specified	1.6V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active

Engineering Selection Recommendations

All listed substitute parts maintain active product status with manufacturers, ensuring ongoing availability and technical support. Selection should prioritize parts with ROHS3 compliance certification where applicable. Microchip Technology parts (24AA64 series, 24FC64 series, AT24C64 series, AT24CS64 series) and Rohm Semiconductor parts (BR24G64 series) are all ROHS3 compliant and REACH unaffected.

For applications requiring performance equivalent to or exceeding the FT24C64A-UTR-B's 800 kHz clock frequency and 700 ns access time, the 24FC64-I/ST, 24FC64F-I/ST, AT24C64D-XHM-B, and AT24CS64-XHM-T are suitable selections, all operating at 1 MHz with access times of 400 ns or 550 ns.

For applications where lower clock frequency operation is acceptable, the 24AA64-E/ST, 24AA64-I/ST, 24AA64F-I/ST, and AT24C64B-10TU-1.8 provide functional alternatives at 400 kHz operation.

The BR24G64FVT-3AGE2 and BR24G64FVT-3GE2 from Rohm Semiconductor offer alternative sourcing with 1 MHz and 400 kHz operation respectively, both with unlimited moisture sensitivity level rating.

Frequently Asked Questions (FAQ)

Q: Can I directly replace FT24C64A-UTR-B with any of these substitute parts?

A: Direct replacement is possible only if the substitute part meets all critical matching parameters: 64Kbit capacity, 8K x 8 organization, I2C interface, 8-TSSOP package, and operating temperature range of -40°C to 85°C. All listed parts satisfy these requirements. Verify that your application's I2C clock frequency requirements are compatible with the substitute part's specified clock frequency.

Q: What is the difference between 24AA64 and 24FC64 series parts?

A: Both series are 64Kbit I2C EEPROM devices in 8-TSSOP packaging. The 24AA64 series operates at 400 kHz with 900 ns access time. The 24FC64 series operates at 1 MHz with 400 ns access time. Selection depends on whether your system requires the higher speed performance of the 24FC64 series or can operate with the lower clock frequency of the 24AA64 series.

Q: Are there packaging differences between Microchip and Rohm parts?

A: Microchip parts use standard 8-TSSOP packaging. Rohm parts use 8-TSSOP-B variant packaging. Both maintain the same 0.173" width and 4.40mm width dimensions and are compatible with standard 8-TSSOP footprints. Consult specific datasheets for any minor dimensional variations.

Q: What does the voltage supply range 1.8V ~ 5.5V mean for substitution?

A: The FT24C64A-UTR-B operates between 1.8V and 5.5V. Substitute parts must support your application's operating voltage. Parts with ranges such as 1.7V ~ 5.5V or 1.6V ~ 5.5V are compatible as they encompass the original range. Parts with minimum voltage of 1.8V (such as AT24C64B-10TU-1.8) are also compatible if your application does not require operation below 1.8V.

Q: Why is the FT24C64A-UTR-B listed as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The substitute parts listed are all active products from established manufacturers, ensuring continued availability for new designs and production requirements.

Q: Can I use BR24G64FVT-3GE2 if my system requires 800 kHz operation?

A: The BR24G64FVT-3GE2 operates at 400 kHz. If your system requires 800 kHz or higher clock frequency, select from the 1 MHz parts: 24FC64-I/ST, 24FC64F-I/ST, AT24C64D-XHM-B, AT24CS64-XHM-T, or BR24G64FVT-3AGE2.

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