FT24C04A-ESR-T EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The FT24C04A-ESR-T is a 4Kbit I2C EEPROM memory integrated circuit manufactured by Fremont Micro Devices Ltd. This non-volatile memory device operates at 1 MHz with 550 ns access time and supports supply voltages from 1.8V to 5.5V across an operating temperature range of -40°C to 85°C. The device is packaged in an 8-SOIC surface mount configuration.

The FT24C04A-ESR-T has been discontinued at DiGi Electronics. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure component availability, and support ongoing production requirements. Substitute parts must maintain identical electrical specifications and mechanical compatibility to ensure direct replacement without circuit redesign.

Key Parameters

Parameter	Specification
Memory Type	Non-Volatile EEPROM
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-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the FT24C04A-ESR-T are qualified based on strict equivalence across the following critical parameters:

Electrical Equivalence Requirements:

Memory Type: Non-Volatile EEPROM
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

Mechanical Equivalence Requirements:

Package Type: 8-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount

All substitute parts listed maintain identical electrical and mechanical specifications to the FT24C04A-ESR-T. Substitutes are differentiated by packaging format (Tape & Reel versus alternative packaging) and product status (Active versus Discontinued).

Parameter Comparison

Part Number	Manufacturer	Memory Size	Interface	Clock Frequency	Access Time	Voltage Supply	Operating Temperature	Package	Product Status	Inventory
FT24C04A-ESR-T	Fremont Micro Devices Ltd	4Kbit	I2C	1 MHz	550 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Discontinued	752 Pcs
FT24C04A-KSR-T	Fremont Micro Devices Ltd	4Kbit	I2C	1 MHz	550 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	10200 Pcs
FT24C04A-KSG-T	Fremont Micro Devices Ltd	4Kbit	I2C	1 MHz	550 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	641 Pcs
FT24C04A-USG-T	Fremont Micro Devices Ltd	4Kbit	I2C	1 MHz	550 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	1156 Pcs
FT24C04A-USR-T	Fremont Micro Devices Ltd	4Kbit	I2C	1 MHz	550 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	3308 Pcs

Engineering Selection Recommendations

Primary Substitute (Recommended for New Designs): FT24C04A-USR-T is the preferred substitute. This part maintains full electrical and mechanical equivalence to the FT24C04A-ESR-T while offering the highest inventory availability (3308 Pcs) and confirmed Active product status. ROHS3 compliance and unlimited moisture sensitivity level (MSL 1) are maintained.

Secondary Substitutes (Alternative Options): FT24C04A-KSR-T and FT24C04A-USG-T are functionally equivalent alternatives with Active status and substantial inventory levels. FT24C04A-KSG-T is available but with lower inventory (641 Pcs).

Compliance Verification: All substitute parts maintain ROHS3 compliance, REACH Unaffected status, and identical ECCN (EAR99) and HTSUS (8542.32.0051) classifications. No additional compliance documentation is required for substitution.

Frequently Asked Questions (FAQ)

Q: Can FT24C04A-KSR-T be used as a direct replacement for FT24C04A-ESR-T? A: Yes. FT24C04A-KSR-T is electrically and mechanically equivalent. Both devices feature 4Kbit I2C EEPROM architecture, 1 MHz clock frequency, 550 ns access time, and 8-SOIC packaging. The primary difference is packaging format (Tape & Reel) and product status (Active versus Discontinued).

Q: What is the difference between FT24C04A-USR-T and FT24C04A-USG-T? A: Both parts are parametrically equivalent with identical electrical specifications and 8-SOIC packaging. The suffix variation indicates different packaging or tape configuration options. Both are suitable for direct substitution.

Q: Are there any temperature or voltage derating considerations when substituting? A: No. All substitute parts maintain the identical operating temperature range (-40°C to 85°C) and supply voltage range (1.8V to 5.5V). No circuit modifications or derating calculations are required.

Q: Is the 8-SOIC package pinout identical across all substitute parts? A: Yes. All substitute parts use the 8-SOIC (0.154", 3.90mm Width) package with identical pinout. PCB footprints and solder reflow profiles remain unchanged.

Q: What is the significance of the product status change from Discontinued to Active? A: Active status indicates ongoing manufacturing and availability. Discontinued status indicates the FT24C04A-ESR-T is no longer produced. Substituting with an Active part ensures long-term supply chain continuity and reduces obsolescence risk.

Q: Do all substitute parts meet the same compliance standards? A: Yes. All substitute parts are ROHS3 compliant, REACH Unaffected, and carry identical ECCN and HTSUS classifications. No additional compliance verification is required for substitution in existing designs.

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