Part A
24LC256T-E/SN
Công nghệ Microchip
- Lifecycle
- Active
- Stock
- 5813 PCS
- Package
- SOIC-8
- Series
- Memory
Replacement verdict
Compatible functional replacement candidate
The 24LC256-E/SN and 24LC256T-E/SN are functionally equivalent I²C serial EEPROM devices sharing identical memory density, voltage range, temperature grade, and package footprint. The only distinction is the delivery form, with the 24LC256T-E/SN supplied on tape and reel for automated assembly. Either part number can be used interchangeably in the same design without electrical or mechanical modification.
Memory Organization
High match
Supply Voltage Range
High match
Operating Temperature Range
High match
Package and Pin Configuration
High match
Parts at a glance
Part B
24LC256-E/SN
Công nghệ Microchip
- Lifecycle
- Active
- Stock
- 7418 PCS
- Package
- SOIC-8
- Series
- Memory
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 24LC256-E/SN | 24LC256T-E/SN | Why it matters |
|---|---|---|---|
| Memory Type | EEPROM | EEPROM | Both are electrically erasable programmable read-only memory, ensuring non-volatile data storage compatibility. |
| Memory Size | 256 Kbit (32K x 8) | 256 Kbit (32K x 8) | Identical storage capacity allows direct substitution without changing system memory mapping. |
| Interface Type | I2C (2-Wire) | I2C (2-Wire) | Same serial protocol ensures compatibility with existing I2C bus controllers and firmware. |
| Clock Frequency | 400 kHz | 400 kHz | Matching maximum clock speed guarantees identical read/write timing performance. |
| Supply Voltage | 2.5 V to 5.5 V | 2.5 V to 5.5 V | Same operating voltage range allows use in both 3.3 V and 5 V systems without level shifting. |
| Operating Temperature Range | -40°C to +125°C | -40°C to +125°C | Extended temperature rating ensures reliable operation in automotive and industrial environments. |
| Package / Case | 8-SOIC | 8-SOIC | Same footprint and pinout enable drop-in replacement on existing PCBs. |
| Mounting Type | Surface Mount | Surface Mount | Both are surface-mount devices, but the tape-and-reel packaging of the T-variant affects assembly line feeding. |
| Packaging | Tube | Tape & Reel | Packaging differs: tube is for manual or low-volume assembly, while tape and reel suits automated pick-and-place production. |
| Write Cycle Time | 5 ms (max) | 5 ms (max) | Identical write cycle time ensures the same firmware timing margins for page write operations. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 24LC256T-E/SN | 24LC256-E/SN |
|---|---|---|
| Part Status | Active | Active |
| Memory Type | Non-Volatile | Non-Volatile |
| Memory Format | EEPROM | EEPROM |
| Technology | EEPROM | EEPROM |
| Memory Size | 256Kb (32K x 8) | 256Kb (32K x 8) |
| Memory Interface | I²C | I²C |
| Clock Frequency | 400 kHz | 400 kHz |
| Write Cycle Time - Word Page | 5ms | 5ms |
| Access Time | 900 ns | 900 ns |
| Voltage - Supply | 2.5V ~ 5.5V | 2.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 125°C (TA) | -40°C ~ 125°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What is the difference between the 24LC256-E/SN and the 24LC256T-E/SN?
The primary difference is the packaging format. The 24LC256-E/SN is supplied in standard tube packaging, while the 24LC256T-E/SN is supplied in tape and reel packaging. Both devices are functionally identical 256 Kbit I2C serial EEPROMs in an 8-lead SOIC package with the same extended temperature range rating.
Are the 24LC256-E/SN and 24LC256T-E/SN electrically and functionally identical?
Yes. Both part numbers refer to the same silicon device: a 256 Kbit (32K x 8) I2C-compatible serial EEPROM. They share identical memory organization, I2C interface, operating voltage range, page size, and temperature specifications. The only difference is the shipping media.
What is the memory organization of the 24LC256-E/SN and 24LC256T-E/SN?
Both devices provide 256 Kbits of memory organized as 32,768 words of 8 bits each (32K x 8). The devices support a 64-byte page write buffer and are accessed via a two-wire I2C serial interface.
What is the operating voltage range for the 24LC256-E/SN and 24LC256T-E/SN?
Both devices operate over a supply voltage range of 2.5 V to 5.5 V, making them suitable for a wide variety of low-voltage and standard 5 V logic systems.
What is the temperature range for the 24LC256-E/SN and 24LC256T-E/SN?
The "-E" suffix indicates an extended temperature range of -40°C to +125°C, which applies to both the 24LC256-E/SN and 24LC256T-E/SN.
What package type do the 24LC256-E/SN and 24LC256T-E/SN use?
Both devices are offered in an 8-lead SOIC (150 mil) package, designated by the "SN" suffix in the part number.
Can the 24LC256-E/SN and 24LC256T-E/SN be used interchangeably in a design?
Yes, from an electrical and functional standpoint they are interchangeable. The choice between them depends on the assembly process: the 24LC256-E/SN (tube) is typically used for manual or small-batch assembly, while the 24LC256T-E/SN (tape and reel) is intended for automated pick-and-place production lines.
What is the maximum clock frequency supported by the 24LC256-E/SN and 24LC256T-E/SN?
Both devices support I2C clock frequencies up to 400 kHz (Fast mode) across the full operating voltage range of 2.5 V to 5.5 V.