AT24C64N-10SC EEPROM 64Kbit I2C Equivalent & Substitute Parts

Part Overview

The AT24C64N-10SC is a 64Kbit EEPROM memory IC manufactured by Microchip Technology, featuring I2C interface with 400 kHz clock frequency and 8-SOIC surface mount packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The AT24C64N-10SC operates within a 4.5V to 5.5V supply voltage range with 0°C to 70°C operating temperature specification and delivers 900 ns access time performance.

Key Parameters

Parameter	AT24C64N-10SC
Memory Type	Non-Volatile EEPROM
Memory Size	64Kbit
Memory Organization	8K x 8
Memory Interface	I2C
Clock Frequency	400 kHz
Access Time	900 ns
Write Cycle Time	10 ms
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Part Status	Obsolete
RoHS Status	RoHS Non-Compliant

Substitute Part Grouping Explanation

Substitution compatibility for the AT24C64N-10SC is determined by the following critical parameters:

Core Functional Requirements:

Memory capacity: 64Kbit
Memory organization: 8K x 8
Interface protocol: I2C
Package type: 8-SOIC form factor (0.154", 3.90mm Width)
Mounting type: Surface Mount

Electrical Compatibility Criteria:

Clock frequency: 400 kHz minimum (higher frequencies are backward compatible)
Access time: 900 ns maximum
Write cycle time: 10 ms maximum
Supply voltage range: Must encompass or exceed 4.5V ~ 5.5V operating window

Substitute parts are grouped into two categories based on voltage supply range compatibility:

Category A - Standard Voltage Range (1.7V ~ 5.5V or wider): Parts with extended lower voltage limits provide superior compatibility with the AT24C64N-10SC's 4.5V ~ 5.5V requirement. These include 24AA64/SN, 24AA64-E/SN, 24AA64T-I/SNG, and STMicroelectronics M24C64 series variants.

Category B - Enhanced Performance (1 MHz clock frequency): Rohm Semiconductor BR24G64 series parts operate at 1 MHz clock frequency, exceeding the 400 kHz specification while maintaining identical memory capacity and 8-SOIC packaging. These parts deliver faster I2C communication while remaining functionally compatible.

All substitute parts maintain 64Kbit capacity, 8K x 8 organization, I2C interface, and 8-SOIC surface mount packaging required for direct substitution.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Write Cycle Time	Voltage Supply	Operating Temperature	Package	Product Status	RoHS Status
AT24C64N-10SC	Microchip Technology	64Kbit	400 kHz	900 ns	10 ms	4.5V ~ 5.5V	0°C ~ 70°C	8-SOIC (3.90mm)	Obsolete	Non-Compliant
24AA64/SN	Microchip Technology	64Kbit	400 kHz	900 ns	5 ms	1.7V ~ 5.5V	0°C ~ 70°C	8-SOIC (3.90mm)	Active	ROHS3 Compliant
24AA64-E/SN	Microchip Technology	64Kbit	400 kHz	900 ns	5 ms	1.7V ~ 5.5V	-40°C ~ 125°C	8-SOIC (3.90mm)	Active	ROHS3 Compliant
24AA64T-I/SNG	Microchip Technology	64Kbit	400 kHz	900 ns	5 ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC (3.90mm)	Active	ROHS3 Compliant
BR24G64F-3AGTE2	Rohm Semiconductor	64Kbit	1 MHz	Not specified	5 ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOP (4.40mm)	Active	ROHS3 Compliant
BR24G64F-3GTE2	Rohm Semiconductor	64Kbit	400 kHz	Not specified	5 ms	1.6V ~ 5.5V	-40°C ~ 85°C	8-SOP (4.40mm)	Active	ROHS3 Compliant
BR24G64FJ-3AGTE2	Rohm Semiconductor	64Kbit	1 MHz	Not specified	5 ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOP-J (3.90mm)	Active	ROHS3 Compliant
BR24G64FJ-3GTE2	Rohm Semiconductor	64Kbit	400 kHz	Not specified	5 ms	1.6V ~ 5.5V	-40°C ~ 85°C	8-SOP-J (3.90mm)	Active	ROHS3 Compliant
BR24T64FJ-WE2	Rohm Semiconductor	64Kbit	400 kHz	Not specified	5 ms	1.6V ~ 5.5V	-40°C ~ 85°C	8-SOP-J (3.90mm)	Active	ROHS3 Compliant
M24C64-DFMN6TP	STMicroelectronics	64Kbit	1 MHz	450 ns	5 ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC (3.90mm)	Active	ROHS3 Compliant
M24C64-DRMN3TP/K	STMicroelectronics	64Kbit	1 MHz	450 ns	4 ms	1.8V ~ 5.5V	-40°C ~ 125°C	8-SOIC (3.90mm)	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation - Direct Replacement: The 24AA64/SN and 24AA64-E/SN from Microchip Technology represent the most direct substitutes for the AT24C64N-10SC. Both parts maintain identical memory capacity (64Kbit), organization (8K x 8), I2C interface, clock frequency (400 kHz), access time (900 ns), and 8-SOIC packaging. These parts are active products with ROHS3 compliance, addressing the obsolescence and RoHS non-compliance status of the original part. The 24AA64-E/SN extends operating temperature to -40°C ~ 125°C, providing enhanced thermal range coverage.

Secondary Recommendation - Enhanced Performance: The M24C64-DFMN6TP and M24C64-DRMN3TP/K from STMicroelectronics offer 1 MHz clock frequency operation with improved 450 ns access time, while maintaining 64Kbit capacity and 8-SOIC packaging. These parts deliver faster I2C communication and are fully backward compatible with 400 kHz bus speeds. The M24C64-DRMN3TP/K includes automotive-grade qualification (AEC-Q100) and extended temperature range (-40°C ~ 125°C), suitable for demanding applications.

Alternative Recommendation - Rohm Semiconductor: The BR24G64FJ-3GTE2 and BR24T64FJ-WE2 from Rohm Semiconductor provide 64Kbit EEPROM functionality with 400 kHz I2C operation in 8-SOP-J packaging (3.90mm width, compatible with 8-SOIC footprints). These parts feature active product status, ROHS3 compliance, and extended temperature range (-40°C ~ 85°C). The BR24G64FJ-3AGTE2 variant offers 1 MHz clock frequency for applications requiring faster I2C communication.

Compliance Considerations: All recommended substitute parts achieve ROHS3 compliance, addressing the non-compliance status of the obsolete AT24C64N-10SC. All substitute parts maintain REACH unaffected status and EAR99 export classification consistent with the original part.

Packaging Compatibility: Microchip 24AA64 series and STMicroelectronics M24C64 series maintain identical 8-SOIC (0.154", 3.90mm Width) packaging, enabling direct PCB footprint compatibility. Rohm Semiconductor BR24G64FJ and BR24T64FJ series use 8-SOP-J packaging with identical 3.90mm width, providing mechanical compatibility with standard 8-SOIC land patterns.

Frequently Asked Questions (FAQ)

Q: Can the 24AA64/SN directly replace the AT24C64N-10SC without PCB modifications?

A: Yes. The 24AA64/SN maintains identical 8-SOIC (0.154", 3.90mm Width) packaging, memory capacity (64Kbit), organization (8K x 8), I2C interface, and 400 kHz clock frequency. Pin-to-pin compatibility is assured. The extended voltage supply range (1.7V ~ 5.5V) encompasses the original part's 4.5V ~ 5.5V requirement. No PCB layout changes are required.

Q: What is the difference between 24AA64/SN and 24AA64-E/SN?

A: Both parts share identical memory specifications and 8-SOIC packaging. The primary difference is operating temperature range: 24AA64/SN operates 0°C ~ 70°C, while 24AA64-E/SN extends to -40°C ~ 125°C. The 24AA64-E/SN is recommended for applications requiring wider temperature coverage or automotive environments.

Q: Why do some substitute parts specify 1 MHz clock frequency instead of 400 kHz?

A: The M24C64-DFMN6TP, M24C64-DRMN3TP/K, and BR24G64F-3AGTE2 operate at 1 MHz I2C clock frequency, exceeding the AT24C64N-10SC's 400 kHz specification. Higher clock frequency devices are fully backward compatible with 400 kHz bus speeds through I2C protocol design. These parts deliver faster data transfer rates while maintaining complete functional compatibility.

Q: Are Rohm Semiconductor BR24G64 series parts compatible with the original AT24C64N-10SC footprint?

A: The BR24G64FJ-3AGTE2, BR24G64FJ-3GTE2, and BR24T64FJ-WE2 use 8-SOP-J packaging with 3.90mm width, matching the AT24C64N-10SC's 8-SOIC (0.154", 3.90mm Width) footprint. These parts are mechanically compatible with standard 8-SOIC land patterns. The BR24G64F-3AGTE2 and BR24G64F-3GTE2 use 8-SOP packaging with 4.40mm width and require footprint verification before substitution.

Q: What is the significance of the write cycle time difference between AT24C64N-10SC (10 ms) and substitute parts (4-5 ms)?

A: The AT24C64N-10SC specifies 10 ms maximum write cycle time, while substitute parts specify 4-5 ms. Faster write cycle times in substitute parts represent improved performance and do not create compatibility issues. Applications designed for 10 ms write cycles will function correctly with faster parts. No firmware or software modifications are required.

Q: Which substitute part is recommended for automotive applications?

A: The M24C64-DRMN3TP/K from STMicroelectronics is qualified to AEC-Q100 automotive standard with -40°C ~ 125°C operating temperature range. This part is specifically designed for automotive-grade applications requiring enhanced reliability and temperature performance.

Q: Are all substitute parts RoHS compliant?

A: Yes. All recommended substitute parts achieve ROHS3 compliance, addressing the RoHS non-compliance status of the obsolete AT24C64N-10SC. All parts maintain REACH unaffected status and EAR99 export classification.

Q: Can the 24AA64T-I/SNG be used as a substitute despite Tape & Reel packaging?

A: Yes. The 24AA64T-I/SNG is functionally identical to 24AA64/SN and 24AA64-E/SN, with the only difference being packaging format (Tape & Reel versus Tube). The part itself maintains identical 8-SOIC form factor, memory specifications, and electrical characteristics. Tape & Reel packaging is suitable for high-volume production environments.

Q: What is the access time specification, and why does it matter for substitution?

A: Access time specifies the maximum delay from I2C address/command transmission to data availability. The AT24C64N-10SC specifies 900 ns access time. Substitute parts with equal or faster access times (such as M24C64 series at 450 ns) are fully compatible and provide improved performance. Slower access times would not be acceptable substitutes.

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