24AA64-E/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 24AA64-E/ST is a 64Kbit I2C EEPROM memory IC manufactured by Microchip Technology, supplied in 8-TSSOP surface mount packaging. This non-volatile memory device operates across a wide voltage range (1.7V to 5.5V) and temperature range (-40°C to 125°C), making it suitable for industrial and consumer applications requiring persistent data storage. The part is currently active in production with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when equivalent memory capacity, interface protocol, package type, and electrical operating ranges are maintained, allowing direct replacement in circuit designs without functional degradation.

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	5ms
Voltage Supply Range	1.7V ~ 5.5V
Operating Temperature	-40°C ~ 125°C
Package Type	8-TSSOP
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 24AA64-E/ST is determined by the following critical parameters:

Core Compatibility Criteria:

Memory capacity: 64Kbit (8K x 8 organization)
Interface protocol: I2C serial communication
Package: 8-TSSOP surface mount form factor
Voltage supply overlap: Minimum 1.7V support required
Temperature range: Minimum -40°C to 85°C support

Acceptable Variations:

Clock frequency: 400 kHz or higher (backward compatible)
Access time: 900 ns or faster (performance improvement acceptable)
Write cycle time: 5ms or faster
Operating temperature upper limit: 85°C or higher (24AA64-E/ST extends to 125°C)
Moisture sensitivity: MSL 1 or MSL 3 (both acceptable for standard applications)

Substitute parts meeting these criteria maintain functional equivalence and pin compatibility with the original design.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temp	Package	MSL
24AA64-E/ST	Microchip Technology	64Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	1
AT24C64B-10TU-1.8	Microchip Technology	64Kbit	400 kHz	900 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	3
AT24C64B-10TU-2.7	Microchip Technology	64Kbit	400 kHz	900 ns	2.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	1
BR24G64FVT-3AGE2	Rohm Semiconductor	64Kbit	1 MHz	Not specified	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	1
BR24G64FVT-3GE2	Rohm Semiconductor	64Kbit	400 kHz	Not specified	1.6V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	1
BR24S64FVT-WE2	Rohm Semiconductor	64Kbit	400 kHz	Not specified	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	1
M24C64-DRDW8TP/K	STMicroelectronics	64Kbit	1 MHz	450 ns	1.8V ~ 5.5V	-40°C ~ 105°C	8-TSSOP	1
M24C64-RDW6TP	STMicroelectronics	64Kbit	1 MHz	450 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	1

Engineering Selection Recommendations

Direct Substitutes (Highest Compatibility):

AT24C64B-10TU-2.7 and BR24S64FVT-WE2 provide the closest functional match to 24AA64-E/ST. Both maintain 400 kHz I2C clock frequency, 64Kbit capacity, 8-TSSOP packaging, and voltage supply range starting at 1.7V. Both are ROHS3 compliant with MSL 1 rating. Operating temperature range extends to -40°C to 85°C, which covers most industrial applications. These parts are suitable for direct PCB replacement without design modification.

Performance-Enhanced Substitutes:

M24C64-DRDW8TP/K and M24C64-RDW6TP (STMicroelectronics) offer 1 MHz I2C clock frequency and 450 ns access time, providing faster data transfer compared to the 400 kHz baseline. M24C64-DRDW8TP/K extends operating temperature to 105°C and includes AEC-Q100 automotive qualification. These parts are suitable when higher I2C bus speeds are required or when automotive-grade reliability is specified.

Voltage-Constrained Substitutes:

AT24C64B-10TU-1.8 operates with minimum supply voltage of 1.8V (versus 1.7V for the original part). This variant is suitable only when the application circuit guarantees minimum 1.8V supply voltage. MSL 3 rating requires controlled storage conditions (168 hours maximum at 60% relative humidity).

Rohm Semiconductor Alternatives:

BR24G64FVT-3AGE2 and BR24G64FVT-3GE2 provide equivalent 64Kbit I2C EEPROM functionality in 8-TSSOP-B package variant. BR24G64FVT-3GE2 matches 400 kHz clock frequency and 1.7V minimum supply voltage. BR24G64FVT-3AGE2 operates at 1 MHz with 1.7V minimum supply. Both are ROHS3 compliant with MSL 1 rating and -40°C to 85°C operating range.

All substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the original part's regulatory standing.

Frequently Asked Questions (FAQ)

Q: Can AT24C64B-10TU-1.8 replace 24AA64-E/ST in all applications?

A: AT24C64B-10TU-1.8 is functionally compatible but has two constraints. The minimum supply voltage is 1.8V instead of 1.7V, so it requires verification that your circuit maintains at least 1.8V under all operating conditions. The MSL 3 rating requires controlled storage at 60% relative humidity for maximum 168 hours before soldering, whereas the original part has unlimited shelf life (MSL 1). If your application operates above 1.8V and storage conditions are controlled, this part is suitable.

Q: What is the difference between 8-TSSOP and 8-TSSOP-B packages?

A: Both packages are physically compatible 8-pin surface mount packages with 0.173" width and 4.40mm body dimensions. The -B designation indicates a package variant from Rohm Semiconductor. Pin assignments and electrical characteristics remain equivalent. PCB footprints designed for standard 8-TSSOP will accommodate 8-TSSOP-B devices without modification.

Q: Why do some substitutes have 1 MHz clock frequency instead of 400 kHz?

A: Higher clock frequency (1 MHz) is a performance enhancement that maintains backward compatibility. I2C devices operating at 1 MHz can communicate with 400 kHz bus masters at the slower speed. If your application requires 400 kHz operation, 1 MHz parts will function correctly at reduced speed. If your system supports higher I2C speeds, 1 MHz parts enable faster data transfer without design changes.

Q: Is M24C64-DRDW8TP/K suitable for automotive applications?

A: M24C64-DRDW8TP/K carries AEC-Q100 automotive qualification and extends operating temperature to 105°C, making it suitable for automotive-grade designs. The original 24AA64-E/ST does not specify automotive qualification. If your application requires automotive-grade components, M24C64-DRDW8TP/K is the appropriate selection among the substitute options.

Q: Can I use BR24G64FVT-3GE2 if my circuit operates at 1.6V minimum supply voltage?

A: Yes. BR24G64FVT-3GE2 specifies 1.6V minimum supply voltage, which is lower than the original part's 1.7V requirement. This part is suitable for low-voltage applications. However, verify that your specific circuit design maintains stable operation at 1.6V, as some analog circuits may have different behavior at lower supply voltages.

Q: What is the impact of different access times (900 ns vs. 450 ns)?

A: Access time is the delay from I2C address/command transmission to data availability. Faster access time (450 ns) reduces overall read cycle duration. For most applications, both 900 ns and 450 ns access times are sufficiently fast and will not impact system performance. Faster access time is beneficial only in time-critical data acquisition or high-speed logging applications.

Q: Are all substitute parts in active production status?

A: Yes. All listed substitute parts are marked as active production status, ensuring long-term availability and supply chain stability. No obsolete or end-of-life parts are included in this substitution list.

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