AT24C64W-10SC-2.7 Equivalent & Substitute Parts

Part Overview

The AT24C64W-10SC-2.7 is a 64Kbit EEPROM memory IC with I2C interface manufactured by Microchip Technology. This device operates at 400 kHz clock frequency with 900 ns access time and supports a supply voltage range of 2.7V to 5.5V. The part is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Manufacturer Part Number	AT24C64W-10SC-2.7
Manufacturer	Microchip Technology
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	2.7V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	8-SOIC
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the AT24C64W-10SC-2.7 is determined by the following critical parameters:

Memory capacity: 64Kbit with 8K x 8 organization
Interface protocol: I2C communication standard
Package type: 8-SOIC surface mount configuration
Voltage compatibility: Supply voltage range must accommodate system requirements
Operating temperature range: Must support application thermal environment
Access time and clock frequency: Performance characteristics for timing-critical applications

Substitute parts are grouped based on functional equivalence in these parameters. Parts maintaining identical memory specifications and I2C interface are considered direct substitutes, with variations in clock frequency, access time, voltage range, and temperature rating noted for application-specific selection.

Parameter Comparison

Parameter	AT24C64W-10SC-2.7	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
Memory Interface	I2C	I2C	I2C	I2C	I2C	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	2.7V ~ 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 Type	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

24AA64T-E/SM (Microchip Technology): This part maintains identical memory specifications and I2C interface with the original AT24C64W-10SC-2.7. It offers improved performance characteristics including faster write cycle time (5 ms vs. 10 ms) and extended operating temperature range (-40°C to 125°C). The device is actively produced and ROHS3 compliant, making it suitable for new designs requiring Microchip Technology components. The 8-SOIJ package differs from the original 8-SOIC, requiring PCB layout verification.

M24C64-RMN6P and M24C64-RMN6TP (STMicroelectronics): These STMicroelectronics parts provide enhanced performance with 1 MHz clock frequency and 450 ns access time. Both devices support lower minimum supply voltage (1.8V) and are ROHS3 compliant. The M24C64-RMN6TP in Cut Tape & Digi-Reel packaging offers higher inventory availability (155,200 pcs) and is actively produced. The M24C64-RMN6P in bulk packaging is also actively produced. Both are suitable for new designs.

M24C64-WMN6P and M24C64-WMN6TP (STMicroelectronics): These parts are classified as "Not For New Designs" and maintain minimum supply voltage of 2.5V. While functionally equivalent in memory specifications and I2C interface, their obsolescence status limits recommendation for new applications. The M24C64-WMN6TP offers higher inventory (91,945 pcs) compared to M24C64-WMN6P (1,105 pcs).

Frequently Asked Questions (FAQ)

Q: Can the 24AA64T-E/SM directly replace the AT24C64W-10SC-2.7 in existing designs?

A: The 24AA64T-E/SM is functionally equivalent in memory capacity, organization, and I2C interface. However, the package type differs (8-SOIJ vs. 8-SOIC), requiring PCB footprint verification. Electrical characteristics are compatible with the original supply voltage range.

Q: What are the performance advantages of STMicroelectronics M24C64 series substitutes?

A: The M24C64-RMN6P and M24C64-RMN6TP offer 2.5x faster clock frequency (1 MHz vs. 400 kHz), 50% faster access time (450 ns vs. 900 ns), and 50% faster write cycle time (5 ms vs. 10 ms). These improvements enable higher data throughput in I2C communication.

Q: Are all substitute parts RoHS compliant?

A: The 24AA64T-E/SM and all M24C64 variants are ROHS3 compliant. The original AT24C64W-10SC-2.7 is RoHS non-compliant.

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

A: The 24AA64T-E/SM supports -40°C to 125°C, providing the widest temperature range among all listed substitutes.

Q: What is the minimum supply voltage requirement for each substitute?

A: The 24AA64T-E/SM supports 1.7V minimum, M24C64-RMN6P and M24C64-RMN6TP support 1.8V minimum, and M24C64-WMN6P and M24C64-WMN6TP support 2.5V minimum. The original part requires 2.7V minimum.

Q: Which substitute parts are recommended for new designs?

A: The 24AA64T-E/SM, M24C64-RMN6P, and M24C64-RMN6TP are actively produced and suitable for new designs. The M24C64-WMN6P and M24C64-WMN6TP are marked "Not For New Designs" and should be avoided in new applications.

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