AT24C64W-10SC EEPROM 64Kbit I2C Equivalent & Substitute Parts

Part Overview

The AT24C64W-10SC is a 64Kbit EEPROM memory IC with I2C interface manufactured by Microchip Technology. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design considerations. The AT24C64W-10SC operates at 400 kHz I2C clock frequency with 900 ns access time and requires a 4.5V to 5.5V supply voltage. Surface mount 8-SOIC packaging enables integration into compact electronic assemblies.

Key Parameters

Parameter	Value
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
Mounting Type	Surface Mount
Package	8-SOIC
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution for the AT24C64W-10SC is determined by the following critical parameters: 64Kbit memory capacity, 8K x 8 organization, I2C interface protocol, and surface mount 8-SOIC package form factor. All substitute parts maintain these core specifications.

The substitute parts are grouped into two categories based on electrical compatibility:

Category 1: Extended Supply Voltage Range (1.7V ~ 5.5V)

24AA64T-E/SM: Microchip Technology active product with wider voltage tolerance and extended temperature range (-40°C ~ 125°C). Write cycle time reduced to 5 ms. RoHS3 compliant.

Category 2: Enhanced Performance (1 MHz I2C Clock)

M24C64-RMN6P, M24C64-RMN6TP, M24C64-WMN6P, M24C64-WMN6TP: STMicroelectronics parts with 1 MHz I2C clock frequency and 450 ns access time. Supply voltage ranges from 1.8V to 5.5V (M24C64-RMN6 series) or 2.5V to 5.5V (M24C64-WMN6 series). All RoHS3 compliant. Write cycle time 5 ms.

Parameter Comparison

Parameter	AT24C64W-10SC	24AA64T-E/SM	M24C64-RMN6P	M24C64-RMN6TP	M24C64-WMN6P	M24C64-WMN6TP
Manufacturer	Microchip Technology	Microchip Technology	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics
Memory Size	64Kbit	64Kbit	64Kbit	64Kbit	64Kbit	64Kbit
Memory Organization	8K x 8	8K x 8	8K x 8	8K x 8	8K x 8	8K x 8
I2C Clock Frequency	400 kHz	400 kHz	1 MHz	1 MHz	1 MHz	1 MHz
Access Time	900 ns	900 ns	450 ns	450 ns	450 ns	450 ns
Write Cycle Time	10 ms	5 ms	5 ms	5 ms	5 ms	5 ms
Voltage Supply Range	4.5V ~ 5.5V	1.7V ~ 5.5V	1.8V ~ 5.5V	1.8V ~ 5.5V	2.5V ~ 5.5V	2.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package	8-SOIC	8-SOIJ	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Product Status	Obsolete	Active	Active	Active	Not For New Designs	Not For New Designs
RoHS Status	RoHS non-compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant

Engineering Selection Recommendations

For new designs, 24AA64T-E/SM is the recommended primary substitute. This Microchip Technology part maintains manufacturer continuity, holds active product status, and provides RoHS3 compliance. The extended supply voltage range (1.7V ~ 5.5V) and wider operating temperature (-40°C ~ 125°C) accommodate diverse application requirements. Improved write cycle time (5 ms versus 10 ms) enhances programming efficiency.

For applications requiring higher I2C clock frequency and faster access time, M24C64-RMN6TP offers the best availability (155,200 pcs in stock) with active product status and RoHS3 compliance. The 1 MHz I2C clock and 450 ns access time provide performance enhancement over the original part.

M24C64-RMN6P and M24C64-WMN6 series parts are functionally equivalent but carry "Not For New Designs" status. These are suitable for legacy system maintenance and replacement applications only.

Frequently Asked Questions (FAQ)

Q: Can I directly replace AT24C64W-10SC with 24AA64T-E/SM without circuit modifications?

A: Yes. Both parts maintain 64Kbit capacity, 8K x 8 organization, I2C interface, and 8-SOIC package form factor. The 24AA64T-E/SM operates within the original 4.5V ~ 5.5V supply range and is electrically compatible. The package designation differs (8-SOIJ versus 8-SOIC), but both are 8-pin surface mount packages with identical pinout and footprint compatibility.

Q: What is the difference between M24C64-RMN6TP and M24C64-WMN6TP?

A: Both parts share identical memory specifications, I2C performance (1 MHz clock, 450 ns access time), and RoHS3 compliance. The primary differences are supply voltage range (M24C64-RMN6TP: 1.8V ~ 5.5V versus M24C64-WMN6TP: 2.5V ~ 5.5V) and packaging format (M24C64-RMN6TP supplied in Cut Tape & Digi-Reel versus M24C64-WMN6TP in Tube). Both carry "Not For New Designs" status.

Q: Why does 24AA64T-E/SM have a lower write cycle time than the original part?

A: Write cycle time is a manufacturing specification that reflects the internal timing of the memory controller. The 24AA64T-E/SM achieves 5 ms write cycle time through improved circuit design compared to the original 10 ms specification. This represents a performance enhancement and does not affect functional compatibility.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed carry RoHS3 compliance certification. The original AT24C64W-10SC is RoHS non-compliant. If RoHS compliance is required for your application, any of the substitute parts satisfy this requirement.

Q: Which substitute part has the widest operating temperature range?

A: The 24AA64T-E/SM operates from -40°C to 125°C, providing the widest temperature range among all listed parts. The STMicroelectronics M24C64 series parts operate from -40°C to 85°C. The original AT24C64W-10SC operates from 0°C to 70°C.

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