24AA64T-I/SM EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 24AA64T-I/SM is a 64Kbit I2C EEPROM memory IC manufactured by Microchip Technology, designed for non-volatile data storage applications requiring I2C serial communication. This device operates at 400 kHz clock frequency with 900 ns access time and supports a supply voltage range of 1.7V to 5.5V across an operating temperature range of -40°C to 85°C. The part is packaged in an 8-SOIJ surface mount configuration and maintains Active product status with ROHS3 compliance.

Equivalent and substitute parts are necessary when the primary part number becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when enhanced performance specifications (such as higher clock frequency or faster access time) are beneficial for system optimization while maintaining functional compatibility.

Substiute Parts

24AA64T-I/SM

Microchip TechnologyIn Stock: 212224AA64T-I/SM Datasheet

Current PartRFQ

24AA64-I/SM

Microchip TechnologyIn Stock: 143624AA64-I/SM Datasheet

DirectRFQ

24FC64T-I/SM

Microchip TechnologyIn Stock: 491824FC64T-I/SM Datasheet

MFR RecommendedRFQ

M24C64-RMN6TP

STMicroelectronicsIn Stock: 155232M24C64-RMN6TP Datasheet

MFR RecommendedRFQ

M24C64-WMN6P

STMicroelectronicsIn Stock: 1194M24C64-WMN6P Datasheet

MFR RecommendedRFQ

M24C64-WMN6TP

STMicroelectronicsIn Stock: 92002M24C64-WMN6TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution validity for the 24AA64T-I/SM is determined by the following critical parameters:

Core Compatibility Requirements:

• Memory Size: 64Kbit (mandatory match)
• Memory Organization: 8K x 8 (mandatory match)
• Memory Interface: I2C (mandatory match)
• Memory Type: Non-Volatile EEPROM (mandatory match)
• Mounting Type: Surface Mount (mandatory match)
• Operating Temperature Range: -40°C ~ 85°C (mandatory match)

Performance Parameters (Substitution Allowed with Enhancement):

• Clock Frequency: 400 kHz minimum (higher frequencies acceptable)
• Access Time: 900 ns maximum (faster access times acceptable)
• Write Cycle Time: 5ms (fixed across all substitutes)
• Voltage Supply Range: Minimum 1.7V required (wider ranges acceptable)

Packaging Considerations:

• Primary package: 8-SOIJ (0.209", 5.30mm Width)
• Acceptable alternative: 8-SOIC (0.154", 3.90mm Width) with physical layout verification
• Packaging format (Tube, Tape & Reel, Cut Tape) does not affect electrical compatibility

Substitute parts meeting all core compatibility requirements and maintaining or exceeding performance parameters are electrically and functionally interchangeable with the 24AA64T-I/SM.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Active Product Status):

24AA64-I/SM represents the direct equivalent to 24AA64T-I/SM with identical electrical specifications and performance characteristics. This substitute is recommended for applications where packaging format (Tube versus unspecified) accommodates manufacturing requirements. Both parts maintain Active product status and full ROHS3 compliance.

24FC64T-I/SM provides enhanced performance with 1 MHz clock frequency and 400 ns access time, representing a performance upgrade while maintaining full backward compatibility. This part is suitable for applications requiring faster I2C communication or reduced access latency. Active product status ensures long-term availability.

M24C64-RMN6TP (STMicroelectronics) offers equivalent 64Kbit I2C EEPROM functionality with 1 MHz operation and 450 ns access time. The narrower 8-SOIC package (0.154", 3.90mm Width) requires PCB layout verification but provides space optimization benefits. Active product status and verified DiGi-Electronics programmability support production deployment.

Secondary Substitutes (Not For New Designs Status):

M24C64-WMN6P and M24C64-WMN6TP are functionally compatible but carry "Not For New Designs" product status. These parts feature 1 MHz clock frequency and 450 ns access time with reduced voltage supply range (2.5V minimum). Use is restricted to legacy system maintenance or replacement applications where new design qualification is not required.

Voltage Supply Consideration:

Applications operating below 1.8V must use 24AA64T-I/SM, 24AA64-I/SM, or 24FC64T-I/SM. STMicroelectronics M24C64 variants require minimum 1.8V (M24C64-RMN6TP) or 2.5V (M24C64-WMN6P, M24C64-WMN6TP), limiting substitution in ultra-low-voltage systems.

Package Dimension Verification:

STMicroelectronics parts utilize narrower 8-SOIC packaging (0.154", 3.90mm Width) compared to Microchip 8-SOIJ (0.209", 5.30mm Width). Physical PCB footprint compatibility must be verified before substitution to ensure proper solder joint formation and thermal management.

Frequently Asked Questions (FAQ)

Q: Can 24FC64T-I/SM replace 24AA64T-I/SM in existing designs?

A: Yes. 24FC64T-I/SM is electrically compatible with enhanced performance specifications. The 1 MHz clock frequency and 400 ns access time represent improvements over the 400 kHz and 900 ns baseline. No design modifications are required; the substitute operates within all electrical and thermal parameters of the original specification.

Q: What is the primary difference between Microchip and STMicroelectronics 64Kbit I2C EEPROM options?

A: Both manufacturers provide functionally equivalent 64Kbit I2C EEPROM devices with identical memory organization and interface protocols. Key differences include package dimensions (Microchip 8-SOIJ 0.209" versus STMicroelectronics 8-SOIC 0.154" width), voltage supply ranges, and product lifecycle status. STMicroelectronics parts offer higher clock frequencies (1 MHz) and faster access times (450 ns) compared to baseline Microchip specifications.

Q: Are M24C64-WMN6P and M24C64-WMN6TP suitable for new product development?

A: No. Both parts carry "Not For New Designs" product status, indicating manufacturer recommendation against use in new applications. These parts are appropriate for legacy system maintenance, field replacements, or applications where existing inventory must be consumed. New designs should prioritize Active status parts: 24AA64-I/SM, 24FC64T-I/SM, or M24C64-RMN6TP.

Q: What packaging formats are available for 64Kbit I2C EEPROM substitutes?

A: Microchip 24AA64 and 24FC64 series are available in Tube and Tape & Reel (TR) packaging. STMicroelectronics M24C64 series are supplied in Cut Tape (CT) & Digi-Reel or Tube formats. Packaging format does not affect electrical compatibility; selection depends on manufacturing process requirements (manual assembly versus automated pick-and-place systems).

Q: Can STMicroelectronics M24C64 parts operate in 1.7V systems?

A: No. M24C64-RMN6TP requires minimum 1.8V supply voltage; M24C64-WMN6P and M24C64-WMN6TP require minimum 2.5V. Applications operating at 1.7V must use Microchip 24AA64T-I/SM, 24AA64-I/SM, or 24FC64T-I/SM, which support the full 1.7V to 5.5V range.

Q: Is physical PCB layout modification required when substituting with STMicroelectronics parts?

A: Possibly. STMicroelectronics 8-SOIC packages are narrower (0.154", 3.90mm Width) than Microchip 8-SOIJ packages (0.209", 5.30mm Width). PCB footprint compatibility must be evaluated. If the original design accommodates the narrower package, no modification is required. If the PCB footprint is tightly constrained to the wider dimension, layout adjustment may be necessary.

Q: What is the significance of "DiGi-Electronics Programmable" designation?

A: This designation indicates verification status for programming compatibility with DiGi-Electronics equipment. 24AA64-I/SM and M24C64 series are verified; 24AA64T-I/SM and 24FC64T-I/SM are not verified. Verified status provides assurance for production programming operations but does not affect functional compatibility in end-use applications.