FT24C04A-UTR-B EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The FT24C04A-UTR-B is a 4Kbit I2C EEPROM memory IC manufactured by Fremont Micro Devices Ltd in an 8-TSSOP surface mount package. This non-volatile memory device operates at 1 MHz clock frequency with 550 ns access time and supports a supply voltage range of 1.8V to 5.5V across an operating temperature range of -40°C to 85°C. The part is currently discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Memory Size	4Kbit
Memory Organization	512 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)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the FT24C04A-UTR-B is determined by strict alignment with the following critical parameters:

Primary Substitution Criteria:

Memory Size: 4Kbit
Memory Organization: 512 x 8
Memory Interface: I2C
Package Type: 8-TSSOP
Voltage Supply Range: Must encompass or be compatible with 1.8V ~ 5.5V
Operating Temperature: Must support -40°C ~ 85°C minimum

Secondary Compatibility Factors:

Clock Frequency: 1 MHz operation required for direct replacement
Access Time: 550 ns or faster acceptable
Write Cycle Time: 5 ms standard
RoHS3 Compliance: Required for regulatory alignment
MSL Rating: Level 1 preferred for unlimited shelf life

Parts are grouped into three categories based on substitution relationship:

Direct Manufacturer Substitutes: Parts from the same manufacturer (Fremont Micro Devices Ltd) with identical electrical specifications and package configuration. These represent the closest functional equivalents.

Parametric Equivalents: Parts meeting all critical electrical and mechanical parameters from the same manufacturer, with minor package or operational variations that do not affect circuit compatibility.

Similar Cross-Manufacturer Substitutes: Parts from alternative manufacturers (Microchip Technology, Rohm Semiconductor) that meet core functional requirements but may have variations in clock frequency, access time, or voltage range that require design verification.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temp	Package	Status	Inventory
FT24C04A-UTR-B	Fremont Micro Devices	4Kbit	1 MHz	550 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Discontinued	824 Pcs
FT24C04A-KTR-B	Fremont Micro Devices	4Kbit	1 MHz	550 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active	822 Pcs
FT24C04A-KTG-B	Fremont Micro Devices	4Kbit	1 MHz	550 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active	1050 Pcs
AT24CS04-XHM-T	Microchip Technology	4Kbit	1 MHz	550 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active	25680 Pcs
AT24HC04B-TH-B	Microchip Technology	4Kbit	1 MHz	550 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active	5080 Pcs
AT24HC04B-TH-T	Microchip Technology	4Kbit	1 MHz	550 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active	8400 Pcs
AT24C04C-XPD-T	Microchip Technology	4Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active	1109 Pcs
BR24G04FVT-3AGE2	Rohm Semiconductor	4Kbit	1 MHz	Not specified	1.6V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active	845 Pcs
BR24G04FVT-3GE2	Rohm Semiconductor	4Kbit	400 kHz	Not specified	1.6V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active	1900 Pcs
BR24L04FVT-WE2	Rohm Semiconductor	4Kbit	400 kHz	Not specified	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active	3840 Pcs
BR24T04FVT-WE2	Rohm Semiconductor	4Kbit	400 kHz	Not specified	1.6V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active	1104 Pcs

Engineering Selection Recommendations

Tier 1 - Direct Replacements (Recommended):

FT24C04A-KTR-B and FT24C04A-KTG-B are direct substitutes from Fremont Micro Devices Ltd with identical electrical specifications to the FT24C04A-UTR-B. Both parts maintain 1 MHz clock frequency, 550 ns access time, and 1.8V to 5.5V supply voltage range. Both are Active status parts with ROHS3 compliance and MSL Level 1 rating. FT24C04A-KTG-B offers higher inventory availability (1050 Pcs) compared to FT24C04A-KTR-B (822 Pcs).

Tier 2 - Parametric Equivalents (Microchip Technology):

AT24HC04B-TH-T and AT24HC04B-TH-B from Microchip Technology meet all critical electrical parameters: 4Kbit memory, 1 MHz operation, 550 ns access time, 1.8V to 5.5V supply voltage, and -40°C to 85°C operating temperature. Both are Active status with ROHS3 compliance. AT24HC04B-TH-T offers significantly higher inventory (8400 Pcs) in tape and reel packaging. AT24CS04-XHM-T provides an alternative with slightly extended lower voltage support (1.7V minimum) and the highest inventory availability (25680 Pcs).

Tier 3 - Cross-Manufacturer Alternatives (Conditional):

BR24G04FVT-3AGE2 from Rohm Semiconductor maintains 1 MHz clock frequency with compatible voltage range (1.6V to 5.5V) and operating temperature. BR24L04FVT-WE2 and BR24T04FVT-WE2 operate at 400 kHz, which is slower than the original 1 MHz specification and requires design verification for timing-critical applications. AT24C04C-XPD-T from Microchip operates at 400 kHz with 900 ns access time and extended temperature range (-40°C to 125°C), suitable only for applications not requiring 1 MHz performance.

Compliance and Certification:

All recommended substitutes maintain ROHS3 compliance and are classified as REACH Unaffected. MSL ratings vary between Level 1 (unlimited shelf life) and Level 3 (168 hours), with Level 1 parts preferred for long-term storage and supply chain flexibility.

Frequently Asked Questions (FAQ)

Q: Can FT24C04A-KTR-B and FT24C04A-KTG-B be used interchangeably with FT24C04A-UTR-B?

A: Yes. Both parts are direct substitutes from the same manufacturer with identical electrical specifications, memory organization, clock frequency, access time, voltage range, and operating temperature. The difference lies in product status (Active vs. Discontinued) and packaging configuration, not functional performance.

Q: What is the difference between 1 MHz and 400 kHz clock frequency variants?

A: Clock frequency determines the maximum I2C bus speed. The original FT24C04A-UTR-B operates at 1 MHz. Parts like BR24G04FVT-3GE2, BR24L04FVT-WE2, and BR24T04FVT-WE2 operate at 400 kHz, limiting I2C communication speed. Use 400 kHz variants only if your application does not require 1 MHz performance.

Q: Are 8-TSSOP and 8-TSSOP-B packages pin-compatible?

A: Both packages are 8-pin TSSOP with 0.173" width and 4.40mm dimensions. Pin compatibility depends on specific pinout verification. Consult manufacturer datasheets to confirm identical pin assignments before substitution.

Q: What does MSL Level 1 vs. Level 3 mean for component selection?

A: MSL (Moisture Sensitivity Level) 1 indicates unlimited shelf life without moisture precautions. MSL Level 3 requires controlled storage conditions (168 hours maximum at specified humidity before reflow). For supply chain flexibility and long-term inventory, Level 1 parts are preferred.

Q: Can AT24C04C-XPD-T replace FT24C04A-UTR-B in all applications?

A: AT24C04C-XPD-T operates at 400 kHz (not 1 MHz) and has 900 ns access time (not 550 ns). It is suitable only for applications that do not require 1 MHz I2C performance. The extended operating temperature range (-40°C to 125°C) and automotive qualification (AEC-Q100) make it suitable for automotive applications with relaxed timing requirements.

Q: Which substitute offers the best inventory availability?

A: AT24CS04-XHM-T from Microchip Technology has the highest inventory availability at 25,680 Pcs. This part maintains 1 MHz clock frequency, 550 ns access time, and compatible voltage/temperature specifications, making it a practical choice for high-volume production.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant and REACH Unaffected, meeting current environmental and regulatory requirements.

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