24FC64T-I/MC EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 24FC64T-I/MC is a 64Kbit EEPROM memory integrated circuit manufactured by Microchip Technology, designed for I2C serial communication applications. This non-volatile memory device operates at 1 MHz clock frequency with 400 ns access time, housed in an 8-DFN (2x3) surface mount package. The part is currently in active production status with 874 units available in inventory.

Substitute parts are identified when equivalent memory capacity, interface protocol, package footprint, and electrical operating ranges align with the original specification, enabling direct replacement in circuit designs without functional compromise.

Key Parameters

Parameter	Value
Memory Size	64Kbit
Memory Organization	8K x 8
Memory Interface	I2C
Clock Frequency	1 MHz
Access Time	400 ns
Write Cycle Time	5 ms
Voltage Supply Range	1.7V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-VFDFN Exposed Pad
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 24FC64T-I/MC is determined by the following critical parameters:

Memory Capacity & Organization: Must be 64Kbit with 8K x 8 organization to maintain software compatibility
Interface Protocol: Must support I2C serial communication for direct pin-level compatibility
Package Footprint: Must use 8-pin DFN or equivalent surface mount package with matching pinout
Voltage Supply Range: Must encompass or exceed the 1.7V ~ 5.5V operating range
Operating Temperature Range: Must support -40°C ~ 85°C minimum specification
Access Time & Clock Frequency: Performance parameters that determine system timing compatibility

Two substitute parts meet these criteria: the 24AA64T-I/MC (Microchip Technology) and the M24C64-DRMF3TG/K (STMicroelectronics).

Parameter Comparison

Parameter	24FC64T-I/MC	24AA64T-I/MC	M24C64-DRMF3TG/K
Manufacturer	Microchip Technology	Microchip Technology	STMicroelectronics
Memory Size	64Kbit	64Kbit	64Kbit
Memory Organization	8K x 8	8K x 8	8K x 8
Memory Interface	I2C	I2C	I2C
Clock Frequency	1 MHz	400 kHz	1 MHz
Access Time	400 ns	900 ns	450 ns
Write Cycle Time	5 ms	5 ms	4 ms
Voltage Supply Range	1.7V ~ 5.5V	1.7V ~ 5.5V	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C
Package Type	8-VFDFN Exposed Pad	8-VFDFN Exposed Pad	8-WFDFN Exposed Pad
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active

Engineering Selection Recommendations

24AA64T-I/MC (Microchip Technology)

This substitute operates at 400 kHz clock frequency with 900 ns access time, both slower than the original 24FC64T-I/MC. It maintains identical voltage supply range (1.7V ~ 5.5V) and operating temperature range (-40°C ~ 85°C). The 24AA64T-I/MC features superior moisture sensitivity (MSL 1 vs. MSL 3) and is verified as DiGi-Electronics programmable. Selection is appropriate for applications where reduced clock frequency and extended access time do not impact system performance requirements.

M24C64-DRMF3TG/K (STMicroelectronics)

This substitute matches the 1 MHz clock frequency and provides 450 ns access time, comparable to the original specification. It extends the operating temperature range to -40°C ~ 125°C and includes AEC-Q100 automotive qualification. The minimum voltage supply is 1.8V (versus 1.7V for the original), which may require verification in low-voltage applications. The M24C64-DRMF3TG/K is suitable for automotive-grade applications and environments requiring extended temperature operation.

Both substitutes are ROHS3 compliant and maintain active production status with substantial inventory availability.

Frequently Asked Questions (FAQ)

Q: Can the 24AA64T-I/MC replace the 24FC64T-I/MC in all applications?

A: The 24AA64T-I/MC is functionally compatible for I2C EEPROM applications requiring 64Kbit capacity. However, its 400 kHz clock frequency and 900 ns access time are slower than the original 1 MHz / 400 ns specification. Substitution is valid only when system timing does not require the higher performance of the original part.

Q: What is the difference between the 8-VFDFN and 8-WFDFN packages?

A: Both are 8-pin DFN packages with 2x3 mm footprint suitable for surface mount assembly. The VFDFN and WFDFN designations indicate minor variations in package geometry and thermal characteristics. Pin compatibility is maintained across both package types for I2C EEPROM devices.

Q: Is the M24C64-DRMF3TG/K suitable for consumer applications?

A: The M24C64-DRMF3TG/K includes AEC-Q100 automotive qualification, making it suitable for automotive and industrial applications. It is also compatible with consumer applications, though the automotive qualification is not required for non-automotive use cases.

Q: What does MSL 3 (168 Hours) mean compared to MSL 1 (Unlimited)?

A: Moisture Sensitivity Level (MSL) indicates the maximum time a component can be exposed to moisture before soldering. MSL 3 allows 168 hours of exposure, while MSL 1 has unlimited exposure time. The 24AA64T-I/MC and M24C64-DRMF3TG/K offer superior moisture tolerance for storage and handling in humid environments.

Q: Can I use the M24C64-DRMF3TG/K in applications requiring 1.7V minimum supply voltage?

A: The M24C64-DRMF3TG/K specifies a minimum supply voltage of 1.8V, compared to 1.7V for the 24FC64T-I/MC. Applications requiring operation below 1.8V must use the original part or the 24AA64T-I/MC, which maintains the 1.7V minimum specification.

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