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AT24C64N-10SC-2.5 Equivalent & Substitute Parts
Part Overview
The AT24C64N-10SC-2.5 is a 64Kbit EEPROM memory IC manufactured by Microchip Technology, featuring I2C interface with 400 kHz clock frequency and 8-SOIC surface mount packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The device operates across a 2.5V to 5.5V supply range with 0°C to 70°C temperature specification and is non-RoHS compliant.
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 | 10ms |
| Voltage Supply Range | 2.5V ~ 5.5V |
| Operating Temperature | 0°C ~ 70°C |
| Package Type | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | Non-compliant |
Substitute Part Grouping Explanation
Substitution for the AT24C64N-10SC-2.5 is determined by the following critical parameters:
- Memory Capacity & Organization: 64Kbit, 8K x 8 configuration (non-negotiable)
- Interface Protocol: I2C communication standard
- Package Compatibility: 8-SOIC form factor with 0.154" (3.90mm) width
- Voltage Tolerance: Supply range must accommodate 2.5V minimum operation
- Clock Frequency: 400 kHz operation capability
- Access Time: 900 ns specification
- Write Cycle Time: Minimum 5ms acceptable (original specifies 10ms)
Substitute parts are grouped into two categories:
Category A - Direct Microchip Equivalents: Parts from Microchip Technology (24AA64 series) offering active product status, RoHS3 compliance, and improved voltage tolerance (1.7V minimum).
Category B - Cross-Manufacturer Alternatives: Rohm Semiconductor and onsemi parts (BR24G64, BR24S64, BR24T64, CAV24C64 series) providing equivalent functionality with extended temperature ranges and automotive-grade certifications where applicable.
Parameter Comparison
| Part Number | Manufacturer | Memory Size | Clock Frequency | Voltage Supply | Operating Temperature | Write Cycle Time | Package | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|
| AT24C64N-10SC-2.5 | Microchip Technology | 64Kbit | 400 kHz | 2.5V ~ 5.5V | 0°C ~ 70°C | 10ms | 8-SOIC (3.90mm) | Obsolete | Non-compliant |
| 24AA64/SN | Microchip Technology | 64Kbit | 400 kHz | 1.7V ~ 5.5V | 0°C ~ 70°C | 5ms | 8-SOIC (3.90mm) | Active | ROHS3 Compliant |
| 24AA64-E/SN | Microchip Technology | 64Kbit | 400 kHz | 1.7V ~ 5.5V | -40°C ~ 125°C | 5ms | 8-SOIC (3.90mm) | Active | ROHS3 Compliant |
| 24AA64T-I/SNG | Microchip Technology | 64Kbit | 400 kHz | 1.7V ~ 5.5V | -40°C ~ 85°C | 5ms | 8-SOIC (3.90mm) | Active | ROHS3 Compliant |
| BR24G64F-3AGTE2 | Rohm Semiconductor | 64Kbit | 1 MHz | 1.7V ~ 5.5V | -40°C ~ 85°C | 5ms | 8-SOP (4.40mm) | Active | ROHS3 Compliant |
| BR24G64F-3GTE2 | Rohm Semiconductor | 64Kbit | 400 kHz | 1.6V ~ 5.5V | -40°C ~ 85°C | 5ms | 8-SOP (4.40mm) | Active | ROHS3 Compliant |
| BR24G64FJ-3AGTE2 | Rohm Semiconductor | 64Kbit | 1 MHz | 1.7V ~ 5.5V | -40°C ~ 85°C | 5ms | 8-SOP-J (3.90mm) | Active | ROHS3 Compliant |
| BR24G64FJ-3GTE2 | Rohm Semiconductor | 64Kbit | 400 kHz | 1.6V ~ 5.5V | -40°C ~ 85°C | 5ms | 8-SOP-J (3.90mm) | Active | ROHS3 Compliant |
| BR24S64FJ-WE2 | Rohm Semiconductor | 64Kbit | 400 kHz | 1.7V ~ 5.5V | -40°C ~ 85°C | 5ms | 8-SOP-J (3.90mm) | Active | ROHS3 Compliant |
| BR24T64FJ-WE2 | Rohm Semiconductor | 64Kbit | 400 kHz | 1.6V ~ 5.5V | -40°C ~ 85°C | 5ms | 8-SOP-J (3.90mm) | Active | ROHS3 Compliant |
| CAV24C64WE-GT3 | onsemi | 64Kbit | 400 kHz | 2.5V ~ 5.5V | -40°C ~ 125°C | 5ms | 8-SOIC (3.90mm) | Active | ROHS3 Compliant |
Engineering Selection Recommendations
Primary Recommendation - Microchip 24AA64/SN: Direct functional equivalent with identical 8-SOIC package geometry, matching 400 kHz I2C clock frequency, and 900 ns access time. Offers active product status, RoHS3 compliance, and improved voltage tolerance (1.7V minimum). Faster write cycle time (5ms vs. 10ms) provides performance enhancement. Suitable for applications requiring standard temperature range (0°C to 70°C).
Extended Temperature Alternative - Microchip 24AA64-E/SN: Identical to 24AA64/SN with extended operating range (-40°C to 125°C). Recommended for industrial and automotive applications requiring broader temperature specification. Maintains identical package and electrical interface.
Automotive-Grade Option - onsemi CAV24C64WE-GT3: Meets AEC-Q100 automotive qualification with identical 8-SOIC package and 400 kHz operation. Voltage supply range (2.5V to 5.5V) matches original specification. Extended temperature range (-40°C to 125°C) and RoHS3 compliance. Suitable for automotive and harsh environment applications.
High-Speed Alternative - Rohm BR24G64FJ-3AGTE2: Offers 1 MHz clock frequency capability while maintaining 64Kbit capacity and 8-SOP-J package compatibility with 3.90mm width. Extended temperature range (-40°C to 85°C) and RoHS3 compliance. Recommended when higher I2C clock speeds are required.
Standard Speed Cross-Manufacturer - Rohm BR24G64FJ-3GTE2 or BR24S64FJ-WE2: Both provide 400 kHz operation with 8-SOP-J package (3.90mm width), matching original form factor. BR24S64FJ-WE2 offers verified programmability status. Extended temperature range and RoHS3 compliance. Suitable for applications requiring cross-manufacturer sourcing flexibility.
Frequently Asked Questions (FAQ)
Q: Can I directly replace AT24C64N-10SC-2.5 with 24AA64/SN without PCB modifications?
A: Yes. Both parts use identical 8-SOIC package with 0.154" (3.90mm) width and matching pin configuration. I2C interface, 400 kHz clock frequency, and 900 ns access time are equivalent. No PCB layout changes required.
Q: What is the key difference between Microchip 24AA64 variants?
A: 24AA64/SN operates 0°C to 70°C in tube packaging. 24AA64-E/SN extends to -40°C to 125°C in tube packaging. 24AA64T-I/SNG provides -40°C to 85°C range in tape & reel packaging. All share identical electrical specifications and 8-SOIC package.
Q: Why do Rohm BR24G64 parts specify 8-SOP package instead of 8-SOIC?
A: BR24G64F variants use 8-SOP (0.173", 4.40mm width) package, which is physically larger than the original 8-SOIC (0.154", 3.90mm width). BR24G64FJ, BR24S64FJ, and BR24T64FJ variants use 8-SOP-J package with 0.154" (3.90mm) width, matching original footprint. Verify PCB layout compatibility before selection.
Q: Is the AT24C64N-10SC-2.5 RoHS compliance status a concern for new designs?
A: Yes. The original part is RoHS non-compliant. All recommended substitutes (24AA64 series, BR24G64 series, CAV24C64WE-GT3) are RoHS3 compliant, meeting current regulatory requirements for new product development and manufacturing.
Q: Can I use BR24G64F-3AGTE2 (1 MHz) as a drop-in replacement for 400 kHz applications?
A: Yes. The BR24G64F-3AGTE2 supports 1 MHz clock frequency but is backward compatible with 400 kHz I2C bus operation. The device automatically adapts to the bus clock speed. No firmware or software changes required.
Q: What is the voltage tolerance difference between AT24C64N-10SC-2.5 and substitutes?
A: Original part operates 2.5V to 5.5V. Microchip 24AA64 series operates 1.7V to 5.5V, providing lower voltage tolerance. Rohm BR24G64F-3GTE2 and BR24T64FJ-WE2 operate 1.6V to 5.5V. onsemi CAV24C64WE-GT3 matches original 2.5V to 5.5V range. Select based on system power supply specifications.
Q: Are there inventory considerations for long-term production?
A: BR24G64FJ-3GTE2 has highest inventory (92,800 pcs), followed by BR24S64FJ-WE2 (24,805 pcs) and CAV24C64WE-GT3 (19,694 pcs). Microchip 24AA64-E/SN has 1,749 pcs available. Verify supplier stock levels for production volume requirements.
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