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24AA64X/ST EEPROM Memory IC - Equivalent & Substitute Parts
Part Overview
The 24AA64X/ST is a 64Kbit EEPROM memory integrated circuit manufactured by Microchip Technology, designed for non-volatile data storage applications requiring I2C serial interface communication. This device operates across a wide supply voltage range of 1.8V to 5.5V and is housed in an 8-TSSOP surface mount package. The part is currently in active production status with RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when equivalent memory capacity, interface protocol, package form factor, and voltage specifications align with application requirements.
Substiute Parts
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 | 1.8V ~ 5.5V |
| Operating Temperature | 0°C ~ 70°C |
| Package Type | 8-TSSOP (0.173", 4.40mm Width) |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
The M24C64-RDW6TP from STMicroelectronics qualifies as a direct substitute based on the following alignment of critical parameters:
Matching Parameters:
- Memory capacity: 64Kbit with 8K x 8 organization
- Serial interface: I2C protocol
- Package form factor: 8-TSSOP with identical 0.173" width and 4.40mm dimensions
- Supply voltage range: 1.8V ~ 5.5V (identical specification)
- Write cycle time: 5ms (identical specification)
- RoHS3 compliance and unlimited MSL rating
Differentiation Parameters:
- Clock frequency: M24C64-RDW6TP operates at 1 MHz versus 400 kHz for 24AA64X/ST
- Access time: M24C64-RDW6TP provides 450 ns versus 900 ns for 24AA64X/ST
- Operating temperature range: M24C64-RDW6TP supports -40°C ~ 85°C versus 0°C ~ 70°C for 24AA64X/ST
The substitute part maintains functional equivalence for I2C EEPROM applications while offering enhanced performance characteristics in clock frequency and access time, with an extended operating temperature range.
Parameter Comparison
| Parameter | 24AA64X/ST (Microchip) | M24C64-RDW6TP (STMicroelectronics) |
|---|---|---|
| Memory Size | 64Kbit | 64Kbit |
| Memory Organization | 8K x 8 | 8K x 8 |
| Memory Interface | I2C | I2C |
| Clock Frequency | 400 kHz | 1 MHz |
| Access Time | 900 ns | 450 ns |
| Write Cycle Time | 5ms | 5ms |
| Voltage Supply Range | 1.8V ~ 5.5V | 1.8V ~ 5.5V |
| Operating Temperature | 0°C ~ 70°C | -40°C ~ 85°C |
| Package Type | 8-TSSOP | 8-TSSOP |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant |
| MSL Rating | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
Both the 24AA64X/ST and M24C64-RDW6TP are active production devices with ROHS3 compliance and REACH unaffected status, suitable for applications requiring regulatory compliance in industrial and consumer electronics. The M24C64-RDW6TP offers superior performance specifications with faster clock frequency and reduced access time, making it applicable to designs requiring higher I2C bus speeds. The extended operating temperature range of the M24C64-RDW6TP (-40°C to 85°C) accommodates automotive and industrial temperature environments, whereas the 24AA64X/ST is limited to 0°C to 70°C. Pin-compatible package geometry ensures direct board-level substitution without layout modifications. Selection between these parts depends on application-specific requirements for operating temperature range and I2C bus speed compatibility.
Frequently Asked Questions (FAQ)
Q: Can M24C64-RDW6TP replace 24AA64X/ST in existing designs?
A: Yes. Both devices share identical memory capacity (64Kbit), I2C interface protocol, supply voltage range (1.8V ~ 5.5V), and 8-TSSOP package dimensions. Pin-to-pin compatibility enables direct substitution without circuit modifications.
Q: What are the performance differences between these parts?
A: The M24C64-RDW6TP operates at 1 MHz clock frequency with 450 ns access time, compared to 400 kHz and 900 ns for the 24AA64X/ST. Both maintain identical 5ms write cycle time. The M24C64-RDW6TP supports extended temperature operation from -40°C to 85°C versus 0°C to 70°C for the 24AA64X/ST.
Q: Are there packaging differences between these parts?
A: No. Both parts use 8-TSSOP surface mount packages with identical 0.173" width and 4.40mm dimensions. Packaging format differs only in supplier delivery method (Tube for 24AA64X/ST versus Cut Tape and Digi-Reel for M24C64-RDW6TP).
Q: Which part should be selected for automotive applications?
A: The M24C64-RDW6TP is suitable for automotive temperature ranges due to its -40°C to 85°C operating specification. The 24AA64X/ST is limited to 0°C to 70°C and is not recommended for automotive environments.
Q: Do both parts meet the same compliance standards?
A: Yes. Both devices are ROHS3 compliant, REACH unaffected, and carry EAR99 ECCN classification with identical HTSUS code 8542.32.0051.
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