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

Part Overview

The FT24C64A-UNR-T is a 64Kbit EEPROM memory IC manufactured by Fremont Micro Devices Ltd, featuring I2C interface operation at 800 kHz with 700 ns access time. This part is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active manufacturers. The device is housed in an 8-DFN (2x3) package and operates across a 1.8V to 5.5V supply range with -40°C to 85°C temperature specifications.

Key Parameters

Parameter	FT24C64A-UNR-T
Memory Size	64Kbit
Memory Organization	8K x 8
Memory Interface	I2C
Clock Frequency	800 kHz
Access Time	700 ns
Write Cycle Time	5 ms
Voltage Supply Range	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-DFN (2x3)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment with the following core parameters: 64Kbit memory capacity, 8K x 8 organization, I2C interface protocol, 8-pin DFN/TDFN/MLP package format (2x3 footprint), and compatible voltage supply range (minimum 1.8V, maximum 5.5V). All substitute parts maintain these baseline requirements.

Secondary performance parameters—clock frequency, access time, and write cycle time—define performance tiers. Parts operating at lower clock frequencies (400 kHz) with longer access times (900 ns) are backward-compatible with the original FT24C64A-UNR-T. Parts with higher clock frequencies (1 MHz) and faster access times (400 ns) provide enhanced performance while maintaining full functional compatibility.

Operating temperature range extensions and automotive-grade certifications represent additional qualifications that do not restrict substitution but indicate enhanced reliability for specific applications.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Write Cycle Time	Voltage Supply	Operating Temperature	Package	Product Status
FT24C64A-UNR-T	Fremont Micro Devices Ltd	64Kbit	800 kHz	700 ns	5 ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-DFN (2x3)	Discontinued
24AA64FT-I/MNY	Microchip Technology	64Kbit	400 kHz	900 ns	5 ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-TDFN (2x3)	Active
24AA64T-E/MNY	Microchip Technology	64Kbit	400 kHz	900 ns	5 ms	1.7V ~ 5.5V	-40°C ~ 125°C	8-TDFN (2x3)	Active
24AA64T-I/MNY	Microchip Technology	64Kbit	400 kHz	900 ns	5 ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-TDFN (2x3)	Active
24FC64FT-I/MNY	Microchip Technology	64Kbit	1 MHz	400 ns	5 ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-TDFN (2x3)	Active
24FC64T-I/MNY	Microchip Technology	64Kbit	1 MHz	400 ns	5 ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-TDFN (2x3)	Active
M24C64-DRMF3TG/K	STMicroelectronics	64Kbit	1 MHz	450 ns	4 ms	1.8V ~ 5.5V	-40°C ~ 125°C	8-MLP (2x3)	Active

Engineering Selection Recommendations

All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the original FT24C64A-UNR-T regulatory profile. Selection among active alternatives depends on application-specific requirements:

For direct performance replacement with minimal system redesign, the Microchip 24AA64 series (24AA64FT-I/MNY, 24AA64T-E/MNY, 24AA64T-I/MNY) provides 64Kbit I2C EEPROM functionality at 400 kHz operation. These parts are pin-compatible and footprint-compatible with the original device.

For applications requiring enhanced performance, the Microchip 24FC64 series (24FC64FT-I/MNY, 24FC64T-I/MNY) operates at 1 MHz with 400 ns access time, delivering faster I2C communication while maintaining identical memory capacity and package format.

The STMicroelectronics M24C64-DRMF3TG/K offers automotive-grade qualification (AEC-Q100) with extended temperature range (-40°C to 125°C) and 1 MHz operation. This part is suitable for automotive and industrial applications requiring enhanced reliability certifications.

Frequently Asked Questions (FAQ)

Q: Can I substitute the FT24C64A-UNR-T with any of the listed parts without circuit modification?

A: Yes. All substitute parts share identical memory capacity (64Kbit), organization (8K x 8), interface protocol (I2C), and package footprint (8-pin DFN/TDFN/MLP 2x3). Pin assignments and functional behavior are compatible across all listed alternatives.

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

A: The 24AA64 series operates at 400 kHz clock frequency with 900 ns access time. The 24FC64 series operates at 1 MHz with 400 ns access time, providing faster I2C communication. Both series maintain identical memory capacity and package compatibility. The 24FC64 is suitable for applications requiring higher data throughput.

Q: Does the STMicroelectronics M24C64-DRMF3TG/K require different handling or assembly procedures?

A: The M24C64-DRMF3TG/K uses an 8-MLP package format instead of TDFN, but maintains the same 2x3 footprint dimensions and pin configuration. Assembly procedures remain identical. The part includes automotive-grade qualification and extended temperature range specifications.

Q: Are there voltage supply compatibility concerns when substituting parts?

A: The original FT24C64A-UNR-T operates at 1.8V to 5.5V. Most Microchip alternatives operate at 1.7V to 5.5V, providing slightly lower minimum voltage tolerance. The STMicroelectronics M24C64-DRMF3TG/K matches the original 1.8V minimum. All parts are compatible with standard 3.3V and 5V supply rails.

Q: Which substitute part offers the best long-term availability?

A: The Microchip 24AA64T-I/MNY and 24FC64T-I/MNY are listed as active products with verified programmable status and substantial inventory levels, indicating strong long-term availability. The STMicroelectronics M24C64-DRMF3TG/K maintains the highest inventory (17,800 pcs) and automotive qualification, supporting extended product lifecycle.

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