FT24C04A-USR-T EEPROM 4Kbit I2C Memory IC Equivalent & Substitute Parts

Part Overview

The FT24C04A-USR-T is a 4Kbit EEPROM memory IC manufactured by Fremont Micro Devices Ltd, designed for I2C serial communication applications. This non-volatile memory device operates at 1 MHz clock frequency with 550 ns access time, housed in an 8-SOP surface mount package. The part is currently active in production with 3,308 units in stock inventory.

Substitute parts are necessary when the primary part becomes unavailable, when alternative sourcing reduces lead times or cost, or when design flexibility requires qualified alternatives that meet identical electrical and mechanical specifications.

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 / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict parameter matching across five critical dimensions:

Memory Specifications: All substitute parts must maintain 4Kbit capacity with 512 x 8 organization and I2C interface protocol.

Electrical Performance: Clock frequency, access time, and write cycle time define operational compatibility. Parts operating at 1 MHz with 550 ns access time are direct parametric equivalents. Parts operating at 400 kHz represent functional alternatives with reduced speed performance but maintain I2C protocol compatibility.

Voltage Compatibility: Supply voltage range must overlap with or exceed the main part specification (1.8V ~ 5.5V). Parts with 1.6V minimum or 1.7V minimum are acceptable for applications within the 1.8V ~ 5.5V window.

Temperature Range: Operating temperature must support the -40°C ~ 85°C specification. Extended temperature ranges (to 105°C or 125°C) provide additional margin but do not disqualify parts.

Package Compatibility: All parts use 8-SOIC (0.154", 3.90mm Width) surface mount packaging, ensuring mechanical and electrical pin compatibility.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temperature	Package	Inventory
FT24C04A-USR-T	Fremont Micro Devices Ltd	4Kbit	1 MHz	550 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOP	3,308 Pcs
FT24C04A-USG-T	Fremont Micro Devices Ltd	4Kbit	1 MHz	550 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOP	1,156 Pcs
AT24CS04-SSHM-T	Microchip Technology	4Kbit	1 MHz	550 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	3,319 Pcs
AT24HC04BN-SH-B	Microchip Technology	4Kbit	1 MHz	550 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	2,200 Pcs
AT24HC04BN-SH-T	Microchip Technology	4Kbit	1 MHz	550 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	9,690 Pcs
BR24G04FJ-3GTE2	Rohm Semiconductor	4Kbit	400 kHz	Not specified	1.6V ~ 5.5V	-40°C ~ 85°C	8-SOP-J	58,185 Pcs
BR24T04FJ-WE2	Rohm Semiconductor	4Kbit	400 kHz	Not specified	1.6V ~ 5.5V	-40°C ~ 85°C	8-SOP-J	2,600 Pcs
M24C04-DRMN3TP/K	STMicroelectronics	4Kbit	1 MHz	450 ns	1.7V ~ 5.5V	-40°C ~ 125°C	8-SOIC	1,102 Pcs
M24C04-DRMN8TP/K	STMicroelectronics	4Kbit	1 MHz	450 ns	1.8V ~ 5.5V	-40°C ~ 105°C	8-SOIC	6,899 Pcs
M24C04-FMN6TP	STMicroelectronics	4Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	5,200 Pcs

Engineering Selection Recommendations

Parametric Equivalents (Direct Substitutes):

FT24C04A-USG-T from Fremont Micro Devices Ltd is a parametric equivalent with identical electrical specifications and packaging. Both parts are active production status with ROHS3 compliance and unlimited moisture sensitivity rating.

Functional Equivalents (1 MHz Performance Class):

AT24CS04-SSHM-T, AT24HC04BN-SH-B, and AT24HC04BN-SH-T from Microchip Technology maintain 1 MHz clock frequency, 550 ns access time, and 4Kbit capacity. AT24HC04BN-SH-T offers the highest inventory availability (9,690 units) among 1 MHz alternatives. M24C04-DRMN3TP/K and M24C04-DRMN8TP/K from STMicroelectronics provide 1 MHz operation with improved 450 ns access time and extended temperature ranges. M24C04-DRMN3TP/K qualifies for automotive applications under AEC-Q100 standard.

Reduced-Speed Alternatives (400 kHz Performance Class):

BR24G04FJ-3GTE2 and BR24T04FJ-WE2 from Rohm Semiconductor operate at 400 kHz clock frequency with extended voltage range (1.6V minimum). These parts are suitable for applications where reduced I2C bus speed is acceptable. M24C04-FMN6TP from STMicroelectronics provides 400 kHz operation with 900 ns access time.

Compliance and Certification:

All listed parts maintain ROHS3 compliance and REACH unaffected status. M24C04-DRMN3TP/K and M24C04-DRMN8TP/K carry AEC-Q100 automotive qualification. AT24HC04BN-SH-T carries MSL-3 (168 Hours) moisture sensitivity rating; all other parts carry MSL-1 (Unlimited).

Frequently Asked Questions (FAQ)

Q: Can I use a 400 kHz part as a direct substitute for the 1 MHz FT24C04A-USR-T?

A: 400 kHz parts (BR24G04FJ-3GTE2, BR24T04FJ-WE2, M24C04-FMN6TP) are functionally compatible but operate at reduced I2C bus speed. They are suitable only if your application does not require 1 MHz performance. Verify I2C bus timing requirements before substitution.

Q: What is the difference between 8-SOP and 8-SOIC packaging?

A: Both designations refer to 8-pin surface mount packages with 0.154" (3.90mm) width and identical pin pitch. The terms are used interchangeably by different manufacturers. All listed parts are mechanically and electrically compatible in PCB layout.

Q: Are the STMicroelectronics M24C04 parts with 450 ns access time faster than the FT24C04A-USR-T?

A: Yes. M24C04-DRMN3TP/K and M24C04-DRMN8TP/K provide 450 ns access time compared to 550 ns for the FT24C04A-USR-T. Faster access time provides additional timing margin but does not affect functional compatibility in standard I2C applications.

Q: Which substitute part has the best inventory availability?

A: BR24G04FJ-3GTE2 from Rohm Semiconductor has the highest inventory at 58,185 units. However, this part operates at 400 kHz. Among 1 MHz alternatives, AT24HC04BN-SH-T offers 9,690 units in stock.

Q: Do I need to verify automotive qualification for non-automotive applications?

A: Automotive qualification (AEC-Q100) is not required for non-automotive applications. M24C04-DRMN3TP/K and M24C04-DRMN8TP/K carry this certification but function identically to non-qualified parts in standard industrial and consumer applications.

Q: What voltage range should I verify before substitution?

A: Confirm your application operates within the overlapping voltage range. The FT24C04A-USR-T requires 1.8V ~ 5.5V. All listed substitutes support this range or exceed it. Parts with 1.6V or 1.7V minimum are acceptable if your circuit maintains 1.8V or higher.

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