24FC64-I/ST EEPROM 64Kbit I2C Memory IC Equivalent & Substitute Parts

Part Overview

The 24FC64-I/ST is a 64Kbit EEPROM memory IC manufactured by Microchip Technology, featuring I2C interface operation at 1 MHz with 400 ns access time. The device is housed in an 8-TSSOP surface mount package and operates across a supply voltage range of 1.7V to 5.5V with an operating temperature range of -40°C to 85°C. Product status is Active with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are necessary when the primary part number becomes unavailable, when alternative packaging formats are required, or when design flexibility permits operation at reduced clock frequencies while maintaining core memory capacity and interface compatibility.

Key Parameters

Parameter	24FC64-I/ST
Memory Size	64Kbit
Memory Organization	8K x 8
Memory Interface	I2C
Clock Frequency	1 MHz
Access Time	400 ns
Write Cycle Time	5 ms
Voltage Supply Range	1.7V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package / Case	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution validity for the 24FC64-I/ST is determined by the following critical parameters:

Core Compatibility Requirements:

Memory Size: 64Kbit (mandatory)
Memory Organization: 8K x 8 (mandatory)
Memory Interface: I2C (mandatory)
Package / Case: 8-TSSOP form factor (mandatory)
Mounting Type: Surface Mount (mandatory)

Operational Compatibility Parameters:

Clock Frequency: 1 MHz (primary specification) or 400 kHz (reduced frequency operation acceptable)
Access Time: 400 ns or greater (slower access acceptable)
Write Cycle Time: 5 ms or less (faster write acceptable)
Voltage Supply Range: Must encompass or overlap with 1.7V ~ 5.5V
Operating Temperature: Must support -40°C ~ 85°C minimum

Compliance Parameters:

RoHS Status: ROHS3 Compliant (required)
Moisture Sensitivity Level: MSL 1 or MSL 3 acceptable for standard applications

Substitute parts are grouped into two categories: MFR Recommended substitutes (verified by manufacturer for direct replacement) and Parametric Equivalents (matching all electrical and mechanical specifications).

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Write Cycle Time	Voltage Supply	Operating Temp	Package	Packaging Format
24FC64-I/ST	Microchip Technology	64Kbit	1 MHz	400 ns	5 ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Tube
24AA64-I/ST	Microchip Technology	64Kbit	400 kHz	900 ns	5 ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Tube
AT24C64D-XHM-B	Microchip Technology	64Kbit	1 MHz	550 ns	5 ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Tube
24FC64F-I/ST	Microchip Technology	64Kbit	1 MHz	400 ns	5 ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Tube
BR24G64FVT-3AGE2	Rohm Semiconductor	64Kbit	1 MHz	Not specified	5 ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Tape & Reel
BR24G64FVT-3GE2	Rohm Semiconductor	64Kbit	400 kHz	Not specified	5 ms	1.6V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Tape & Reel
BR24S64FVT-WE2	ROHM Semiconductor	64Kbit	400 kHz	Not specified	5 ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Tape & Reel
BR24T64FVT-WE2	Rohm Semiconductor	64Kbit	400 kHz	Not specified	5 ms	1.6V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Tape & Reel
CAV24C64YE-GT3	onsemi	64Kbit	400 kHz	900 ns	5 ms	2.5V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Tape & Reel
M24C64-DRDW3TP/K	STMicroelectronics	64Kbit	1 MHz	450 ns	4 ms	1.8V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Cut Tape & Digi-Reel
M24C64-DRDW8TP/K	STMicroelectronics	64Kbit	1 MHz	450 ns	4 ms	1.8V ~ 5.5V	-40°C ~ 105°C	8-TSSOP	Tape & Reel

Engineering Selection Recommendations

Direct Parametric Equivalents (Identical Electrical Specifications):

The 24FC64F-I/ST is a parametric equivalent offering identical clock frequency (1 MHz), access time (400 ns), and operating parameters to the 24FC64-I/ST. Both devices maintain ROHS3 compliance and MSL 1 rating. Selection between these parts depends on packaging format availability and inventory status.

MFR Recommended Substitutes with 1 MHz Operation:

The AT24C64D-XHM-B and M24C64 series (M24C64-DRDW3TP/K, M24C64-DRDW8TP/K) maintain 1 MHz clock frequency operation with slightly increased access times (550 ns and 450 ns respectively). The M24C64 series offers automotive-grade qualification (AEC-Q100) and extended operating temperature to 125°C. The AT24C64D-XHM-B provides MSL 3 rating suitable for standard industrial applications.

Reduced Frequency Substitutes (400 kHz Operation):

The 24AA64-I/ST, BR24G64FVT-3GE2, BR24S64FVT-WE2, BR24T64FVT-WE2, and CAV24C64YE-GT3 operate at 400 kHz clock frequency. These parts are suitable for applications where reduced I2C bus speed is acceptable. The CAV24C64YE-GT3 includes automotive qualification (AEC-Q100) and extended temperature range (-40°C to 125°C).

Packaging and Format Considerations:

Rohm Semiconductor parts (BR24 series) are supplied in Tape & Reel format with 8-TSSOP-B package variant. STMicroelectronics M24C64 series offers Cut Tape & Digi-Reel or Tape & Reel formats. Microchip Technology parts are available in Tube packaging. Selection should align with procurement and assembly requirements.

Voltage Supply Compatibility:

All substitute parts support the 1.7V to 5.5V supply range of the primary part, with the exception of CAV24C64YE-GT3 (2.5V minimum) and BR24G64FVT-3GE2, BR24T64FVT-WE2 (1.6V minimum). Verify minimum supply voltage requirements for applications operating below 1.8V.

Frequently Asked Questions (FAQ)

Q: Can the 24AA64-I/ST replace the 24FC64-I/ST in all applications?

A: The 24AA64-I/ST is electrically compatible but operates at 400 kHz instead of 1 MHz. Substitution is valid only if the application does not require 1 MHz I2C bus speed. All other parameters including memory capacity, organization, voltage range, and temperature range are identical.

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

A: Both packages maintain the same 0.173" width and 4.40mm physical dimensions required for 8-TSSOP form factor compatibility. The -B designation indicates a variant used by Rohm Semiconductor. Pin configuration and electrical compatibility remain consistent with standard 8-TSSOP specifications.

Q: Are the M24C64 series parts from STMicroelectronics direct replacements?

A: The M24C64-DRDW3TP/K and M24C64-DRDW8TP/K maintain 1 MHz operation and are electrically compatible. Access time is 450 ns (versus 400 ns) and write cycle time is 4 ms (versus 5 ms). These parts include automotive qualification and extended temperature range to 125°C. Substitution is valid for all standard and automotive applications.

Q: Why do some substitute parts have unspecified access times?

A: Rohm Semiconductor BR24 series datasheets provided do not include access time specifications in the supplied parameters. Electrical compatibility is confirmed through matching memory size, organization, interface, clock frequency, and package specifications. Consult manufacturer datasheets for complete timing specifications.

Q: Can I use CAV24C64YE-GT3 in applications requiring 1.7V minimum supply voltage?

A: No. The CAV24C64YE-GT3 specifies a minimum supply voltage of 2.5V. This part is not suitable for applications requiring operation below 2.5V. Use 24FC64-I/ST, 24AA64-I/ST, or other substitutes with 1.7V minimum rating for low-voltage applications.

Q: What is the significance of AEC-Q100 qualification on M24C64 and CAV24C64YE-GT3?

A: AEC-Q100 qualification indicates automotive-grade reliability testing and is required for automotive applications. Standard industrial applications do not require this qualification. Both qualified and non-qualified parts are electrically compatible for non-automotive use.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance matching the primary 24FC64-I/ST specification.

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