24LC512-E/SN vs 24LC512-I/SN

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Technical review by ETEI Component Engineering Source: manufacturer documentation

Replacement verdict

Compatible functional replacement candidate

The 24LC512-I/SN and 24LC512-E/SN are functionally equivalent 512 Kbit I²C serial EEPROM devices from Microchip Technology, sharing identical memory density, organization, interface, and package footprint. The primary distinction is the operating temperature range: the I/SN variant is rated for industrial temperature range (−40°C to +85°C), while the E/SN variant is rated for extended temperature range (−40°C to +125°C). Because the E/SN variant covers a wider temperature envelope that fully encompasses the industrial range, it can serve as a drop-in replacement for the I/SN in most applications, provided the higher temperature grade is acceptable or beneficial. Conversely, substituting the I/SN for the E/SN in extended-temperature applications is not recommended. Designers should verify application-specific thermal requirements before finalizing the replacement.

Memory Density and Organization High match
Interface Type High match
Package Type High match
Operating Temperature Range Validation required

Review the critical differences →

Parts at a glance

Key differences

Rows are prioritized by design impact. Highlighted values require attention during substitution.

Key electrical and mechanical differences between the two devices

Parameter 24LC512-I/SN 24LC512-E/SN Why it matters
Operating Temperature Range -40°C to +85°C -40°C to +125°C The extended temperature range of the E-grade version allows operation in harsher environments such as automotive or industrial applications, while the I-grade is limited to standard industrial ranges.
Memory Size 512 Kbit 512 Kbit Both devices provide the same storage capacity, ensuring functional equivalence for data logging or configuration storage.
Memory Organization 64K x 8 64K x 8 Identical organization means the same addressing scheme and byte-level access, allowing drop-in replacement without firmware changes.
Interface Type I²C (2-wire) I²C (2-wire) Both use the standard I²C bus, so they are compatible with the same host controllers and bus topologies.
Supply Voltage Range 2.5 V to 5.5 V 2.5 V to 5.5 V Matching voltage ranges ensures both parts can operate from the same power rail without level shifting.
Maximum Clock Frequency 400 kHz 400 kHz Same maximum clock speed means identical data throughput and timing compatibility with the I²C master.
Package / Mounting Type 8-SOIC (Surface Mount) 8-SOIC (Surface Mount) Identical package and footprint allow the same PCB layout and assembly process for both variants.
Write Cycle Time (Max) 5 ms 5 ms Equal write cycle time ensures the same system-level timing for write operations and polling routines.
Endurance 1,000,000 Write Cycles 1,000,000 Write Cycles Same endurance rating means both devices offer equivalent reliability for high-write applications.
Data Retention 200 Years 200 Years Identical data retention ensures long-term storage reliability is the same for both parts.

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Full specification comparison

Use manufacturer datasheets as the final authority.

Specification 24LC512-E/SN 24LC512-I/SN
Part Status Active Active
Base Product Number 24LC512 -
Digi Key Programmable Verified -
Memory Type Non-Volatile Non-Volatile
Memory Format EEPROM EEPROM
Technology EEPROM EEPROM
Memory Size 512Kbit 512Kb (64K x 8)
Memory Organization 64K x 8 -
Memory Interface I2C I²C
Clock Frequency 400 kHz 400 kHz
Write Cycle Time - Word, Page 5ms -
Voltage - Supply 2.5V ~ 5.5V 2.5V ~ 5.5V
Operating Temperature -40°C ~ 125°C (TA) -40°C ~ 85°C (TA)
Mounting Type Surface Mount Surface Mount
Packaging Tube -
Access Time 900 ns 900 ns
Write Cycle Time - Word Page - 5ms

Frequently asked questions

What is the difference between the 24LC512-I/SN and the 24LC512-E/SN?

The primary difference is the operating temperature range. The 24LC512-I/SN is specified for the industrial temperature range of -40°C to +85°C, while the 24LC512-E/SN is specified for the extended temperature range of -40°C to +125°C. Both devices are otherwise functionally identical 512 Kbit I2C serial EEPROMs in the SOIC-8 package.

Are the 24LC512-I/SN and 24LC512-E/SN pin-to-pin and functionally compatible?

Yes. Both devices share the same 512 Kbit memory density, I2C interface, SOIC-8 package, and pinout. They are functionally interchangeable provided the application's operating temperature range does not exceed the limits of the selected variant.

What is the memory organization of the 24LC512-I/SN and 24LC512-E/SN?

Both devices are organized as 65,536 words of 8 bits (64 Kbytes) and support byte write and page write operations with a page size of 128 bytes. They operate over the standard I2C voltage range of 2.5V to 5.5V.

Can the 24LC512-I/SN be used in place of the 24LC512-E/SN in an application that requires 125°C operation?

No. The 24LC512-I/SN is only rated for operation up to +85°C. For applications requiring operation up to +125°C, the 24LC512-E/SN must be used, as it is the variant qualified for the extended temperature range.

What is the maximum clock frequency of the 24LC512-I/SN and 24LC512-E/SN?

Both devices support a maximum I2C clock frequency of 400 kHz (Fast mode) across their respective rated voltage and temperature ranges, as specified in the Microchip datasheet.

Do the 24LC512-I/SN and 24LC512-E/SN have the same packaging and moisture sensitivity level?

Yes. Both are offered in the same 8-lead SOIC (SN) package and share the same moisture sensitivity level and reflow profile as defined by Microchip for this package family.

Which variant should be selected for automotive or high-temperature industrial designs?

The 24LC512-E/SN should be selected for designs where the ambient or board-level temperature can exceed +85°C, such as certain automotive or high-temperature industrial applications. The 24LC512-I/SN is appropriate for standard industrial applications within -40°C to +85°C.

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