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

Part Overview

The FT24C08A-UTR-B is an 8Kbit I2C EEPROM memory IC manufactured by Fremont Micro Devices Ltd in an 8-TSSOP surface mount package. This part is discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design support and production continuity. The device operates across a 1.8V to 5.5V supply range with a 1 MHz I2C clock frequency and 550 ns access time, serving applications requiring non-volatile serial memory storage.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile EEPROM
Memory Size	8Kbit
Memory Organization	1K x 8
Interface	I2C
Clock Frequency	1 MHz
Access Time	550 ns
Write Cycle Time	5 ms
Supply Voltage 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-B is determined by the following critical parameters:

Core Compatibility Requirements:

Memory capacity: 8Kbit (1K x 8 organization)
Interface protocol: I2C serial communication
Package: 8-TSSOP form factor with 0.173" width and 4.40mm width dimensions
Supply voltage range: Must encompass or overlap with 1.8V ~ 5.5V
Operating temperature: Must support -40°C ~ 85°C minimum
Non-volatile EEPROM technology

Performance Considerations:

Clock frequency: 1 MHz operation (400 kHz variants are backward compatible but operate at reduced speed)
Access time: 550 ns or faster
Write cycle time: 5 ms or faster

Substitute parts are grouped into two categories: direct 1 MHz equivalents and 400 kHz compatible alternatives. All listed substitutes maintain identical memory capacity, I2C interface, and 8-TSSOP packaging. Voltage supply ranges and temperature ratings vary within acceptable overlap margins. All parts comply with ROHS3 and maintain EAR99 export classification.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Supply Voltage	Temp Range	Package	Status
FT24C08A-UTR-B	Fremont Micro Devices	8Kbit (1K x 8)	1 MHz	550 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Discontinued
AT24CS08-XHM-T	Microchip Technology	8Kbit (1K x 8)	1 MHz	550 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
M24C08-DRDW3TP/K	STMicroelectronics	8Kbit (1K x 8)	1 MHz	450 ns	1.7V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
M24C08-DRDW8TP/K	STMicroelectronics	8Kbit (1K x 8)	1 MHz	450 ns	1.8V ~ 5.5V	-40°C ~ 105°C	8-TSSOP	Active
BR24T08FVT-WE2	Rohm Semiconductor	8Kbit (1K x 8)	400 kHz	Not specified	1.6V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active
BR24L08FVT-WE2	Rohm Semiconductor	8Kbit (1K x 8)	400 kHz	Not specified	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active
BR24S08FVT-WE2	Rohm Semiconductor	8Kbit (1K x 8)	400 kHz	Not specified	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active
BR24G08FVT-3GE2	Rohm Semiconductor	8Kbit (1K x 8)	400 kHz	Not specified	1.6V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active
CAT24C08YI-G	onsemi	8Kbit (1K x 8)	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
M24C08-FDW6TP	STMicroelectronics	8Kbit (1K x 8)	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
M24C08-RDW6TP	STMicroelectronics	8Kbit (1K x 8)	400 kHz	900 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active

Engineering Selection Recommendations

Primary Equivalents (1 MHz I2C Operation):

AT24CS08-XHM-T (Microchip Technology) and M24C08-DRDW3TP/K or M24C08-DRDW8TP/K (STMicroelectronics) provide direct functional equivalence to the FT24C08A-UTR-B. These parts maintain 1 MHz clock frequency, identical memory organization, and 8-TSSOP packaging. All three are in active production status. M24C08-DRDW3TP/K carries AEC-Q100 automotive qualification and supports extended temperature operation to 125°C. M24C08-DRDW8TP/K extends to 105°C. AT24CS08-XHM-T operates to 85°C standard industrial range. All three comply with ROHS3 and maintain supply voltage compatibility within the original specification range.

Secondary Alternatives (400 kHz I2C Operation):

Rohm Semiconductor BR24 series (BR24T08FVT-WE2, BR24L08FVT-WE2, BR24S08FVT-WE2, BR24G08FVT-3GE2) and STMicroelectronics M24C08-FDW6TP and M24C08-RDW6TP operate at 400 kHz I2C frequency. These are functionally compatible in systems designed for 400 kHz or lower I2C bus speeds. All maintain 8Kbit capacity, 1K x 8 organization, and 8-TSSOP packaging. onsemi CAT24C08YI-G also operates at 400 kHz. These alternatives are suitable for applications where reduced I2C clock speed is acceptable or required by system design constraints.

Compliance and Availability:

All substitute parts maintain ROHS3 compliance and EAR99 export classification. Inventory availability ranges from 954 to 30,400 units across active suppliers. M24C08-DRDW3TP/K carries verified DiGi-Electronics programmability status. BR24L08FVT-WE2 and BR24S08FVT-WE2 are verified programmable. Selection should prioritize active production status parts to ensure long-term supply continuity.

Frequently Asked Questions (FAQ)

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

A: 400 kHz parts are functionally compatible if your system I2C bus operates at 400 kHz or lower. The FT24C08A-UTR-B supports 1 MHz operation. If your application requires 1 MHz I2C speed, use AT24CS08-XHM-T, M24C08-DRDW3TP/K, or M24C08-DRDW8TP/K. I2C is backward compatible, so 1 MHz-capable parts work on 400 kHz buses, but 400 kHz parts cannot exceed that frequency.

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

A: Both are 8-pin thin shrink small outline packages with identical 0.173" width and 4.40mm width dimensions. The -B designation indicates a variant used by Rohm Semiconductor. Pin configurations and footprints are compatible for PCB layout purposes.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance status, matching the original FT24C08A-UTR-B specification.

Q: Which substitute offers the widest operating temperature range?

A: M24C08-DRDW3TP/K (STMicroelectronics) supports -40°C to 125°C, exceeding the original -40°C to 85°C range. This part also carries AEC-Q100 automotive qualification.

Q: Can I mix different manufacturers' parts in the same design?

A: Yes. All substitute parts maintain identical I2C interface protocol, memory organization (1K x 8), and 8-TSSOP packaging. They are electrically and mechanically interchangeable within the specified parameter ranges. Verify supply voltage and temperature requirements match your application.

Q: What is the minimum supply voltage compatibility across all substitutes?

A: The lowest minimum supply voltage among substitutes is 1.6V (BR24T08FVT-WE2 and BR24G08FVT-3GE2). Most alternatives support 1.7V or 1.8V minimum. The original FT24C08A-UTR-B specifies 1.8V minimum. Confirm your application supply voltage against the selected substitute datasheet.

Q: Are there automotive-qualified alternatives?

A: M24C08-DRDW3TP/K carries AEC-Q100 qualification and supports -40°C to 125°C operation, suitable for automotive applications. M24C08-DRDW8TP/K also carries AEC-Q100 qualification with -40°C to 105°C range.

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