FT24C08A-UTR-T EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The FT24C08A-UTR-T is an 8Kbit I2C EEPROM memory IC manufactured by Fremont Micro Devices Ltd in 8-TSSOP surface mount packaging. This non-volatile memory device operates at 1 MHz clock frequency with 550 ns access time and supports supply voltages from 1.8V to 5.5V across the -40°C to 85°C operating temperature range. The part is discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and production requirements.

Key Parameters

Parameter	Value
Memory Size	8Kbit
Memory Organization	1K x 8
Memory Interface	I2C
Clock Frequency	1 MHz
Access Time	550 ns
Write Cycle Time	5 ms
Voltage Supply Range	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the FT24C08A-UTR-T is determined by the following critical parameters:

Primary Substitution Criteria:

Memory Size: 8Kbit (mandatory match)
Memory Organization: 1K x 8 (mandatory match)
Memory Interface: I2C (mandatory match)
Package Type: 8-TSSOP (mandatory match)
Mounting Type: Surface Mount (mandatory match)

Secondary Compatibility Parameters:

Clock Frequency: 1 MHz (preferred) or 400 kHz (acceptable with reduced performance)
Voltage Supply Range: Must encompass or exceed 1.8V ~ 5.5V
Operating Temperature: Must support -40°C ~ 85°C minimum
Access Time: 550 ns (preferred) or higher values acceptable
Write Cycle Time: 5 ms or faster acceptable

Substitute parts are grouped into two categories: parametric equivalents (identical specifications from the same manufacturer) and similar parts (functionally compatible from alternative manufacturers with minor parameter variations).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temp	Package	Product Status
FT24C08A-UTR-T	Fremont Micro Devices Ltd	8Kbit	1 MHz	550 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Discontinued
FT24C08A-ETG-T	Fremont Micro Devices Ltd	8Kbit	1 MHz	550 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
FT24C08A-ETR-T	Fremont Micro Devices Ltd	8Kbit	1 MHz	550 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
AT24CS08-XHM-T	Microchip Technology	8Kbit	1 MHz	550 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
BR24G08FVT-3GE2	Rohm Semiconductor	8Kbit	400 kHz	Not specified	1.6V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active
BR24L08FVT-WE2	Rohm Semiconductor	8Kbit	400 kHz	Not specified	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active
BR24S08FVT-WE2	Rohm Semiconductor	8Kbit	400 kHz	Not specified	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active
BR24T08FVT-WE2	Rohm Semiconductor	8Kbit	400 kHz	Not specified	1.6V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active
CAT24C08YI-GT3	onsemi	8Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
M24C08-DRDW3TP/K	STMicroelectronics	8Kbit	1 MHz	450 ns	1.7V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
M24C08-DRDW8TP/K	STMicroelectronics	8Kbit	1 MHz	450 ns	1.8V ~ 5.5V	-40°C ~ 105°C	8-TSSOP	Active

Engineering Selection Recommendations

Parametric Equivalents (Preferred for Direct Replacement):

FT24C08A-ETG-T and FT24C08A-ETR-T are parametric equivalents from Fremont Micro Devices Ltd with identical electrical specifications to the discontinued FT24C08A-UTR-T. Both parts are active products with ROHS3 compliance and unlimited moisture sensitivity rating. The primary difference is packaging format: ETG-T in tape and reel with 21,156 units in stock, and ETR-T in tape and reel with 843 units in stock. These represent the most direct substitution path.

High-Performance Alternatives (1 MHz Operation):

M24C08-DRDW3TP/K and M24C08-DRDW8TP/K from STMicroelectronics maintain 1 MHz clock frequency operation with improved access time (450 ns versus 550 ns). Both are AEC-Q100 qualified automotive-grade parts with ROHS3 compliance. M24C08-DRDW3TP/K supports -40°C to 125°C operating range, while M24C08-DRDW8TP/K supports -40°C to 105°C. These parts are suitable for applications requiring extended temperature performance.

AT24CS08-XHM-T from Microchip Technology operates at 1 MHz with 550 ns access time, matching the original part's performance profile. Supply voltage range extends to 1.7V minimum, and the part is active with ROHS3 compliance.

Lower-Speed Alternatives (400 kHz Operation):

Rohm Semiconductor BR24L08FVT-WE2, BR24S08FVT-WE2, BR24G08FVT-3GE2, and BR24T08FVT-WE2 operate at 400 kHz clock frequency with 8-TSSOP-B packaging. These parts are suitable for applications where reduced I2C bus speed is acceptable. BR24L08FVT-WE2 and BR24S08FVT-WE2 are verified for DiGi-Electronics programmability. All Rohm parts maintain unlimited moisture sensitivity rating and ROHS3 compliance.

CAT24C08YI-GT3 from onsemi operates at 400 kHz with 900 ns access time in standard 8-TSSOP packaging. This part is verified for DiGi-Electronics programmability and maintains ROHS3 compliance with unlimited moisture sensitivity.

Frequently Asked Questions (FAQ)

Q: Can I use a 400 kHz I2C EEPROM as a direct replacement for the 1 MHz FT24C08A-UTR-T?

A: 400 kHz parts are functionally compatible if your application does not require 1 MHz bus speed operation. The I2C protocol supports multiple clock frequencies on the same bus. Verify that your system design accommodates the reduced clock frequency before substitution.

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

A: Both packages are 8-pin thin shrink small outline packages with 0.173" width and 4.40mm body width. The -B designation indicates a variant package form. Pin compatibility and PCB footprint are equivalent for substitution purposes.

Q: Are the Rohm BR24 series parts pin-compatible with the FT24C08A-UTR-T?

A: Yes. All substitute parts listed maintain the same 8-TSSOP pin configuration and I2C interface. Pin-to-pin compatibility is confirmed across all listed alternatives.

Q: What does AEC-Q100 qualification mean for the STMicroelectronics M24C08 parts?

A: AEC-Q100 qualification indicates the part meets automotive industry reliability and quality standards. These parts are suitable for automotive applications and extended temperature range operation (-40°C to 125°C for M24C08-DRDW3TP/K).

Q: Which substitute part has the best availability?

A: BR24T08FVT-WE2 from Rohm Semiconductor has the highest inventory at 30,400 units in stock. FT24C08A-ETG-T from Fremont Micro Devices Ltd has 21,156 units available as a parametric equivalent.

Q: Can I mix different EEPROM manufacturers on the same I2C bus?

A: Yes. Multiple I2C EEPROM devices from different manufacturers can operate on the same bus provided they have unique I2C addresses and compatible voltage/timing specifications. Verify address configuration in your system design.

Q: What is the significance of the access time parameter?

A: Access time (550 ns for the original, 450 ns for M24C08 variants, 900 ns for CAT24C08YI-GT3) defines the maximum delay from I2C read command to data availability. Faster access times provide better performance but are not required for most applications. Slower access times are acceptable if your system timing does not depend on minimum access time specifications.

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