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24AA64T-E/ST EEPROM Memory IC Equivalent & Substitute Parts
Part Overview
The 24AA64T-E/ST is a 64Kbit I2C EEPROM memory integrated circuit manufactured by Microchip Technology. This non-volatile memory device operates at 400 kHz I2C clock frequency with 900 ns access time and is housed in an 8-TSSOP surface mount package. The part is currently active in production with RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1).
Substitute parts are identified when equivalent electrical performance, memory capacity, interface protocol, and package specifications are maintained within the allowed operational parameters. Alternative sources become necessary for supply chain continuity, inventory availability, or specific application requirements within the defined electrical and thermal operating ranges.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Memory Size | 64Kbit | — |
| Memory Organization | 8K x 8 | — |
| Memory Interface | I2C | — |
| Clock Frequency | 400 kHz | — |
| Access Time | 900 ns | — |
| Write Cycle Time | 5 ms | — |
| Supply Voltage 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 24AA64T-E/ST is determined by strict equivalence across the following critical parameters:
Memory Specifications: All substitute parts must maintain 64Kbit capacity with 8K x 8 organization and I2C interface protocol.
Electrical Compatibility: Supply voltage range must encompass or overlap with the main part's 1.7V ~ 5.5V specification. Clock frequency and access time determine functional compatibility; parts operating at 400 kHz or higher are functionally equivalent.
Thermal Operating Range: The main part operates from -40°C to 125°C. Substitute parts with reduced upper temperature limits (-40°C to 85°C) are acceptable for applications not requiring the extended 125°C capability.
Package Specifications: All parts must use 8-TSSOP surface mount package with 0.173" width (4.40mm) to ensure PCB footprint compatibility.
Compliance & Certification: RoHS3 compliance and REACH unaffected status are maintained across all listed substitutes. Moisture sensitivity level (MSL) variations are noted but do not preclude substitution.
Substitute parts are grouped by manufacturer and specific electrical characteristics to facilitate selection based on supply availability and application-specific requirements.
Parameter Comparison
| Part Number | Manufacturer | Memory Size | Clock Frequency | Access Time | Supply Voltage | Temp Range | Write Cycle | MSL | Inventory |
|---|---|---|---|---|---|---|---|---|---|
| 24AA64T-E/ST | Microchip | 64Kbit | 400 kHz | 900 ns | 1.7V ~ 5.5V | -40°C ~ 125°C | 5 ms | 1 | 1089 |
| AT24C64B-10TU-1.8 | Microchip | 64Kbit | 400 kHz | 900 ns | 1.8V ~ 5.5V | -40°C ~ 85°C | 5 ms | 3 | 10170 |
| AT24C64B-10TU-2.7 | Microchip | 64Kbit | 400 kHz | 900 ns | 2.7V ~ 5.5V | -40°C ~ 85°C | 5 ms | 1 | 3897 |
| BR24G64FVT-3AGE2 | Rohm | 64Kbit | 1 MHz | Not specified | 1.7V ~ 5.5V | -40°C ~ 85°C | 5 ms | 1 | 7035 |
| BR24G64FVT-3GE2 | Rohm | 64Kbit | 400 kHz | Not specified | 1.6V ~ 5.5V | -40°C ~ 85°C | 5 ms | 1 | 35400 |
| BR24S64FVT-WE2 | Rohm | 64Kbit | 400 kHz | Not specified | 1.7V ~ 5.5V | -40°C ~ 85°C | 5 ms | 1 | 3589 |
| CAT24C64YI-GT3 | onsemi | 64Kbit | 1 MHz | 400 ns | 1.7V ~ 5.5V | -40°C ~ 85°C | 5 ms | 1 | 15652 |
| M24C64-DRDW8TP/K | STMicroelectronics | 64Kbit | 1 MHz | 450 ns | 1.8V ~ 5.5V | -40°C ~ 105°C | 4 ms | 1 | 3650 |
| M24C64-RDW6TP | STMicroelectronics | 64Kbit | 1 MHz | 450 ns | 1.8V ~ 5.5V | -40°C ~ 85°C | 5 ms | 1 | 35200 |
Engineering Selection Recommendations
Microchip AT24C64B Series (AT24C64B-10TU-1.8, AT24C64B-10TU-2.7): These parts maintain 400 kHz I2C operation and 900 ns access time matching the main part's performance profile. Both are active production parts with RoHS3 compliance. AT24C64B-10TU-2.7 offers MSL 1 rating identical to the main part. Supply availability is high (10170 and 3897 units respectively). Temperature range is reduced to -40°C ~ 85°C; selection depends on application thermal requirements.
Rohm BR24G64 and BR24S64 Series (BR24G64FVT-3GE2, BR24S64FVT-WE2): BR24G64FVT-3GE2 operates at 400 kHz with 1.6V ~ 5.5V supply range and maintains MSL 1 rating. Inventory is highest among all substitutes (35400 units). BR24S64FVT-WE2 provides 400 kHz operation with 1.7V ~ 5.5V range and MSL 1 rating (3589 units). Both are active production parts with RoHS3 compliance. Temperature range is -40°C ~ 85°C.
onsemi CAT24C64YI-GT3: Operates at 1 MHz clock frequency with 400 ns access time, providing enhanced performance over the main part. Supply voltage 1.7V ~ 5.5V matches the main part. MSL 1 rating and RoHS3 compliance confirmed. DiGi-Electronics Programmable status is verified. Inventory is substantial (15652 units). Temperature range is -40°C ~ 85°C.
STMicroelectronics M24C64 Series (M24C64-DRDW8TP/K, M24C64-RDW6TP): Both operate at 1 MHz with 450 ns access time. M24C64-DRDW8TP/K includes AEC-Q100 automotive qualification and extends operating temperature to -40°C ~ 105°C, exceeding the main part's upper limit. Supply voltage is 1.8V ~ 5.5V. M24C64-RDW6TP maintains -40°C ~ 85°C range with 5 ms write cycle. Both are active production parts with RoHS3 compliance and MSL 1 rating. M24C64-RDW6TP offers highest inventory (35200 units).
Selection Criteria: For direct replacement in applications operating within -40°C ~ 85°C, Microchip AT24C64B-10TU-2.7 or Rohm BR24G64FVT-3GE2 provide optimal compatibility. For applications requiring extended temperature operation to 125°C, the main part 24AA64T-E/ST is required. For enhanced I2C performance at 1 MHz, onsemi CAT24C64YI-GT3 or STMicroelectronics M24C64 series are suitable. For automotive-grade applications, M24C64-DRDW8TP/K with AEC-Q100 qualification is specified.
Frequently Asked Questions (FAQ)
Q: Can AT24C64B-10TU-1.8 replace 24AA64T-E/ST in all applications?
A: AT24C64B-10TU-1.8 is functionally equivalent for I2C EEPROM operations at 400 kHz. However, the supply voltage minimum is 1.8V versus 1.7V for the main part, and the operating temperature maximum is 85°C versus 125°C. Verify application requirements for low-voltage operation below 1.8V and high-temperature operation above 85°C before substitution.
Q: What is the difference between BR24G64FVT-3GE2 and BR24S64FVT-WE2?
A: Both are Rohm 64Kbit I2C EEPROM devices in 8-TSSOP package with 400 kHz operation and MSL 1 rating. BR24G64FVT-3GE2 supports 1.6V ~ 5.5V supply voltage and has higher inventory (35400 units). BR24S64FVT-WE2 supports 1.7V ~ 5.5V supply voltage with lower inventory (3589 units). Selection depends on minimum supply voltage requirement and availability.
Q: Why do STMicroelectronics M24C64 parts operate at 1 MHz instead of 400 kHz?
A: M24C64-DRDW8TP/K and M24C64-RDW6TP are designed for 1 MHz I2C operation, providing faster data transfer rates than the 400 kHz main part. This enhanced performance is backward compatible with 400 kHz I2C bus systems; the device will operate at the lower bus speed when connected to a 400 kHz master. Access time is 450 ns versus 900 ns for the main part.
Q: Is the onsemi CAT24C64YI-GT3 a direct replacement?
A: CAT24C64YI-GT3 is functionally compatible with 64Kbit I2C EEPROM operation and 8-TSSOP package. It operates at 1 MHz with 400 ns access time, exceeding the main part's performance. Supply voltage range 1.7V ~ 5.5V matches the main part. Operating temperature is -40°C ~ 85°C. DiGi-Electronics Programmable status is verified. It is suitable for direct replacement in applications not requiring operation above 85°C.
Q: What does MSL rating mean for EEPROM substitution?
A: Moisture Sensitivity Level (MSL) indicates the maximum time a component can be exposed to moisture before soldering. MSL 1 (unlimited) means no time restriction. MSL 3 (168 hours) requires soldering within 168 hours of package opening. The main part has MSL 1. AT24C64B-10TU-1.8 has MSL 3, requiring stricter handling. All other substitutes have MSL 1. MSL rating does not affect electrical performance but impacts storage and assembly procedures.
Q: Can I use M24C64-DRDW8TP/K in non-automotive applications?
A: Yes. M24C64-DRDW8TP/K is AEC-Q100 qualified for automotive use but is not restricted to automotive applications. It provides 64Kbit I2C EEPROM functionality with 1 MHz operation and extended temperature range (-40°C ~ 105°C). It is suitable for any application requiring these specifications.
Q: What is the package compatibility between all listed parts?
A: All parts use 8-TSSOP surface mount package with 0.173" width (4.40mm). Physical footprint and pin configuration are identical. PCB layout and soldering procedures are compatible across all listed substitutes. Verify specific package variant designations (8-TSSOP versus 8-TSSOP-B) with PCB design tools if required.
Q: Which substitute has the best inventory availability?
A: BR24G64FVT-3GE2 (Rohm) has the highest inventory at 35400 units, followed by M24C64-RDW6TP (STMicroelectronics) at 35200 units. Both provide 400 kHz or higher I2C operation with MSL 1 rating and RoHS3 compliance. For immediate availability, these two parts are recommended.
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