24LC64-I/SN EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 24LC64-I/SN is a 64Kbit I2C EEPROM memory IC manufactured by Microchip Technology, supplied in 8-SOIC surface mount packaging. This non-volatile memory device operates at 400 kHz I2C clock frequency with 900 ns access time and supports supply voltages from 2.5V to 5.5V across an operating temperature range of -40°C to 85°C. The part is ROHS3 compliant and actively produced. Equivalent and substitute parts are identified based on matching memory capacity, interface protocol, package type, and electrical operating parameters to ensure functional interchangeability in target applications.

Key Parameters

Parameter	24LC64-I/SN
Memory Size	64Kbit
Memory Organization	8K x 8
Memory Interface	I2C
Clock Frequency	400 kHz
Access Time	900 ns
Write Cycle Time	5ms
Voltage Supply Range	2.5V ~ 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

Substitute parts for the 24LC64-I/SN are grouped based on the following substitution criteria:

Primary Substitution Parameters:

Memory Size: 64Kbit (fixed requirement)
Memory Organization: 8K x 8 (fixed requirement)
Memory Interface: I2C (fixed requirement)
Package / Case: 8-SOIC (fixed requirement)
Mounting Type: Surface Mount (fixed requirement)

Secondary Compatibility Parameters:

Clock Frequency: 400 kHz (standard) or 1 MHz (enhanced performance)
Access Time: 900 ns (standard) or 400-550 ns (faster variants)
Voltage Supply Range: Must encompass or exceed 2.5V ~ 5.5V
Operating Temperature: Must support -40°C ~ 85°C minimum
RoHS Compliance: ROHS3 required

Substitutes are divided into two functional groups: (1) Direct equivalents operating at 400 kHz with 900 ns access time, and (2) Enhanced-performance variants operating at 1 MHz with faster access times. All substitutes maintain identical memory capacity, organization, interface protocol, and physical packaging.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temperature	Package	RoHS Status	Product Status
24LC64-I/SN	Microchip	64Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	ROHS3	Active
24AA64-E/SN	Microchip	64Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 125°C	8-SOIC	ROHS3	Active
24AA64-I/SN	Microchip	64Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	ROHS3	Active
24AA64F-I/SN	Microchip	64Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	ROHS3	Active
24FC64-I/SN	Microchip	64Kbit	1 MHz	400 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	ROHS3	Active
24FC64F-I/SN	Microchip	64Kbit	1 MHz	400 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	ROHS3	Active
24LC64-E/SN	Microchip	64Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-SOIC	ROHS3	Active
24LC64F-E/SN	Microchip	64Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-SOIC	ROHS3	Active
AT24C64BN-10SU-2.7	Microchip	64Kbit	400 kHz	900 ns	2.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	ROHS3	Active
AT24C64D-SSHM-T	Microchip	64Kbit	1 MHz	550 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	ROHS3	Active
AT24CS64-SSHM-B	Microchip	64Kbit	1 MHz	550 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	ROHS3	Active

Engineering Selection Recommendations

All listed substitute parts maintain active product status and ROHS3 compliance, ensuring long-term availability and regulatory conformance. Selection between substitute options depends on application-specific requirements:

For Direct Functional Equivalence (400 kHz Operation): 24AA64-I/SN, 24AA64F-I/SN, 24LC64-E/SN, and 24LC64F-E/SN provide identical I2C clock frequency and access time performance. The 24AA64 series supports extended lower voltage operation (1.7V minimum) compared to the 24LC64-I/SN (2.5V minimum), enabling use in low-power applications. The 24LC64-E/SN and 24LC64F-E/SN extend operating temperature to 125°C, suitable for industrial environments.

For Enhanced Performance (1 MHz Operation): 24FC64-I/SN, 24FC64F-I/SN, AT24C64D-SSHM-T, and AT24CS64-SSHM-B operate at 1 MHz I2C frequency with reduced access times (400-550 ns), providing faster data retrieval. These variants support 1.7V minimum supply voltage and maintain -40°C to 85°C operating range. AT24C64D-SSHM-T is available in tape and reel packaging for high-volume production.

For Voltage-Constrained Applications: AT24C64BN-10SU-2.7 specifies 2.7V minimum supply voltage, bridging the gap between 24LC64-I/SN (2.5V) and 24AA64 series (1.7V) for applications requiring moderate low-voltage tolerance.

Frequently Asked Questions (FAQ)

Q: Can 24AA64-I/SN replace 24LC64-I/SN in all applications? A: Yes, for applications operating within 2.5V to 5.5V supply range and -40°C to 85°C temperature. The 24AA64-I/SN supports lower minimum voltage (1.7V) and identical I2C performance, making it functionally compatible. Verify supply voltage requirements in your circuit design.

Q: What is the difference between 24LC64-I/SN and 24FC64-I/SN? A: The 24FC64-I/SN operates at 1 MHz I2C clock frequency with 400 ns access time, compared to 24LC64-I/SN at 400 kHz with 900 ns access time. Both share identical memory capacity and 8-SOIC packaging. Use 24FC64-I/SN for applications requiring faster I2C communication speeds.

Q: Are all substitute parts available in 8-SOIC packaging? A: Yes, all listed substitutes are supplied in 8-SOIC (0.154", 3.90mm Width) surface mount packaging, ensuring mechanical and electrical compatibility with 24LC64-I/SN PCB layouts.

Q: What does the temperature range difference mean for part selection? A: 24LC64-I/SN operates -40°C to 85°C. Extended-range variants like 24LC64-E/SN and 24AA64-E/SN support -40°C to 125°C, required for industrial or automotive applications. Standard-range parts are suitable for commercial and consumer electronics.

Q: Can I use AT24C64D-SSHM-T as a drop-in replacement? A: AT24C64D-SSHM-T is electrically compatible but operates at 1 MHz instead of 400 kHz. It is a functional upgrade providing faster access times. Verify I2C bus speed compatibility in your system before substitution. Packaging differs (tape and reel vs. tube).

Q: Which substitute offers the lowest minimum supply voltage? A: 24AA64-I/SN, 24FC64-I/SN, 24FC64F-I/SN, AT24C64D-SSHM-T, and AT24CS64-SSHM-B all support 1.7V minimum supply voltage, enabling operation in ultra-low-power applications compared to 24LC64-I/SN at 2.5V minimum.

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