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24LC64T-E/SN EEPROM Memory IC Equivalent & Substitute Parts
Part Overview
The 24LC64T-E/SN is a 64Kbit I2C EEPROM memory IC manufactured by Microchip Technology, packaged in 8-SOIC surface mount configuration. This non-volatile memory device operates at 400 kHz I2C clock frequency with 900 ns access time and supports supply voltages from 2.5V to 5.5V across an operating temperature range of -40°C to 125°C. The device is ROHS3 compliant and carries active product status with verified programmability. Equivalent and substitute parts are identified based on matching memory capacity, I2C interface protocol, package compatibility, and electrical operating parameters.
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 | 2.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 125°C |
| Package Type | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitute parts for the 24LC64T-E/SN are grouped based on the following critical parameters that determine functional compatibility:
Primary Substitution Criteria:
- Memory capacity: 64Kbit with 8K x 8 organization
- Interface protocol: I2C serial communication
- Package footprint: 8-SOIC surface mount configuration
- Supply voltage compatibility: Minimum 2.5V support or lower
- Operating temperature range: Support for -40°C minimum and 125°C maximum, or equivalent industrial range
Secondary Compatibility Factors:
- Clock frequency: 400 kHz baseline; higher frequencies (1 MHz) remain compatible with I2C protocol
- Access time: Faster access times are compatible; slower times may impact system performance
- Write cycle time: 5ms standard; variations within 4-5ms range are acceptable
- Moisture sensitivity level: Lower MSL ratings indicate better shelf life and handling characteristics
Substitutes are classified into two categories: direct equivalents matching all primary parameters, and compatible alternatives with enhanced specifications (higher clock frequency, wider voltage range, or extended temperature support).
Parameter Comparison
| Part Number | Manufacturer | Memory Size | Clock Frequency | Access Time | Voltage Supply | Operating Temp | Package | MSL | Product Status |
|---|---|---|---|---|---|---|---|---|---|
| 24LC64T-E/SN | Microchip Technology | 64Kbit | 400 kHz | 900 ns | 2.5V ~ 5.5V | -40°C ~ 125°C | 8-SOIC (3.90mm) | 1 (Unlimited) | Active |
| 24LC64-E/SN | Microchip Technology | 64Kbit | 400 kHz | 900 ns | 2.5V ~ 5.5V | -40°C ~ 125°C | 8-SOIC (3.90mm) | 3 (168 Hours) | Active |
| AT24C64BN-10SU-2.7 | Microchip Technology | 64Kbit | 400 kHz | 900 ns | 2.7V ~ 5.5V | -40°C ~ 85°C | 8-SOIC (3.90mm) | 3 (168 Hours) | Active |
| BR24G64F-3AGTE2 | Rohm Semiconductor | 64Kbit | 1 MHz | Not specified | 1.7V ~ 5.5V | -40°C ~ 85°C | 8-SOP (4.40mm) | 1 (Unlimited) | Active |
| BR24G64F-3GTE2 | Rohm Semiconductor | 64Kbit | 400 kHz | Not specified | 1.6V ~ 5.5V | -40°C ~ 85°C | 8-SOP (4.40mm) | 1 (Unlimited) | Active |
| BR24L64FJ-WE2 | Rohm Semiconductor | 64Kbit | 400 kHz | Not specified | 1.8V ~ 5.5V | -40°C ~ 85°C | 8-SOP-J (3.90mm) | 1 (Unlimited) | Active |
| BR24S64FJ-WE2 | Rohm Semiconductor | 64Kbit | 400 kHz | Not specified | 1.7V ~ 5.5V | -40°C ~ 85°C | 8-SOP-J (3.90mm) | 1 (Unlimited) | Active |
| CAT24C64WI-G | onsemi | 64Kbit | 1 MHz | 400 ns | 1.7V ~ 5.5V | -40°C ~ 85°C | 8-SOIC (3.90mm) | 1 (Unlimited) | Active |
| CAT24C64WI-GT3 | onsemi | 64Kbit | 1 MHz | 400 ns | 1.7V ~ 5.5V | -40°C ~ 85°C | 8-SOIC (3.90mm) | 1 (Unlimited) | Active |
| M24C64-DFMN6TP | STMicroelectronics | 64Kbit | 1 MHz | 450 ns | 1.7V ~ 5.5V | -40°C ~ 85°C | 8-SOIC (3.90mm) | 1 (Unlimited) | Active |
| M24C64-DRMN3TP/K | STMicroelectronics | 64Kbit | 1 MHz | 450 ns | 1.8V ~ 5.5V | -40°C ~ 125°C | 8-SOIC (3.90mm) | 1 (Unlimited) | Active |
Engineering Selection Recommendations
Direct Equivalent (Packaging Variant): The 24LC64-E/SN from Microchip Technology is a direct functional equivalent differing only in packaging format (Tube versus Cut Tape & Digi-Reel). Both devices maintain identical electrical specifications and ROHS3 compliance. Selection between these variants depends on procurement and assembly requirements.
Microchip AT24C64BN-10SU-2.7: This part provides equivalent 64Kbit I2C EEPROM functionality with identical clock frequency and access time. The minimum supply voltage increases to 2.7V, which may limit compatibility in systems requiring 2.5V operation. Operating temperature maximum reduces to 85°C, restricting use in extended temperature applications. Product status is active with verified programmability.
Rohm Semiconductor BR24L64FJ-WE2 and BR24S64FJ-WE2: Both Rohm parts maintain 400 kHz I2C clock frequency and 8-SOP-J package footprint compatible with 3.90mm width. Supply voltage ranges from 1.7V to 1.8V minimum, supporting lower voltage applications. Operating temperature maximum of 85°C limits extended temperature range applications. Both carry active product status with verified programmability and unlimited moisture sensitivity level.
Rohm Semiconductor BR24G64F-3GTE2: This variant operates at 400 kHz matching the primary part's clock frequency. The 8-SOP package with 4.40mm width represents a physical footprint variation requiring PCB layout verification. Supply voltage minimum of 1.6V extends low-voltage compatibility. Product status is active; programmability is not verified.
onsemi CAT24C64WI-G and CAT24C64WI-GT3: Both onsemi parts feature enhanced 1 MHz clock frequency and faster 400 ns access time compared to the 24LC64T-E/SN baseline. The 8-SOIC package maintains 3.90mm width compatibility. Supply voltage range of 1.7V to 5.5V supports lower voltage operation. Operating temperature maximum of 85°C restricts extended temperature applications. Both carry active product status with verified programmability.
STMicroelectronics M24C64-DFMN6TP: This part provides 1 MHz I2C operation with 450 ns access time. The 8-SOIC package maintains 3.90mm width footprint. Supply voltage range of 1.7V to 5.5V supports lower voltage systems. Operating temperature maximum of 85°C limits extended temperature range. Product status is active with verified programmability.
STMicroelectronics M24C64-DRMN3TP/K (Automotive Grade): This variant qualifies as an automotive-grade component with AEC-Q100 qualification. It maintains 1 MHz clock frequency and 450 ns access time. The 8-SOIC package preserves 3.90mm width compatibility. Supply voltage range of 1.8V to 5.5V supports lower voltage operation. Operating temperature range of -40°C to 125°C matches the primary part's extended temperature capability. Product status is active with verified programmability. Write cycle time of 4ms is marginally faster than the 5ms baseline.
Frequently Asked Questions (FAQ)
Q: Can I substitute the 24LC64T-E/SN with a part operating at 1 MHz instead of 400 kHz?
A: Yes. I2C protocol supports multiple clock frequencies. Parts operating at 1 MHz (CAT24C64WI-G, CAT24C64WI-GT3, M24C64-DFMN6TP, M24C64-DRMN3TP/K) are compatible with systems designed for 400 kHz operation. The I2C bus will operate at the lower speed determined by the slowest device present.
Q: What is the impact of different package widths (3.90mm versus 4.40mm)?
A: Package width affects PCB footprint and land pattern design. The 24LC64T-E/SN uses 8-SOIC with 3.90mm width. Rohm BR24G64F series parts use 8-SOP with 4.40mm width, requiring PCB layout verification before substitution. Other substitute parts maintain the 3.90mm width for direct footprint compatibility.
Q: Are there supply voltage compatibility concerns?
A: The 24LC64T-E/SN operates from 2.5V to 5.5V. Substitute parts with higher minimum voltage requirements (2.7V for AT24C64BN-10SU-2.7, 1.6V to 1.8V for others) may not function in systems designed for 2.5V operation. Verify system supply voltage specifications before selection.
Q: Does operating temperature range affect substitution decisions?
A: The 24LC64T-E/SN supports -40°C to 125°C operation. Most substitute parts limit maximum temperature to 85°C, restricting use in extended temperature applications. The M24C64-DRMN3TP/K maintains -40°C to 125°C range, making it suitable for equivalent temperature performance.
Q: What is the significance of MSL (Moisture Sensitivity Level) ratings?
A: MSL 1 (Unlimited) indicates no moisture sensitivity restrictions and indefinite shelf life. MSL 3 (168 Hours) requires controlled storage conditions and limits shelf life to 168 hours after packaging opening. The 24LC64T-E/SN carries MSL 1 rating. The 24LC64-E/SN variant carries MSL 3, requiring more stringent handling procedures.
Q: Can I use the automotive-grade M24C64-DRMN3TP/K in non-automotive applications?
A: Yes. Automotive-grade components meet or exceed commercial specifications. The M24C64-DRMN3TP/K with AEC-Q100 qualification provides enhanced reliability and extended temperature range suitable for both automotive and industrial applications.
Q: How do access time differences affect system performance?
A: The 24LC64T-E/SN specifies 900 ns access time. Substitute parts with faster access times (400 ns for onsemi CAT24C64WI series) improve read performance but remain compatible with systems designed for 900 ns operation. Slower access times would require system timing verification.
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