Part A
24LC256T-I/SN
マイクロチップ・テクノロジー
- Lifecycle
- Active
- Stock
- 6175 個数
- Package
- SOIC-8
- Series
- メモリ
Replacement verdict
Compatible functional replacement candidate
The 24LC256T-I/SN and 24LC256-E/SN are functionally equivalent 256 Kbit I²C serial EEPROM devices from the same manufacturer and die family, sharing identical memory organization, interface, voltage range, and package footprint. The only meaningful distinction is the operating temperature grade, with the E-grade part offering an extended range suitable for harsher environments. The I-grade device can therefore serve as a drop-in substitute in commercial-temperature applications, while the E-grade part provides broader thermal headroom where required.
Memory Density and Organization
High match
Interface Type
High match
Package Type
High match
Operating Temperature Range
Validation required
Parts at a glance
Part B
24LC256-E/SN
マイクロチップ・テクノロジー
- Lifecycle
- Active
- Stock
- 7418 個数
- Package
- SOIC-8
- Series
- メモリ
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 24LC256T-I/SN | 24LC256-E/SN | Why it matters |
|---|---|---|---|
| Operating Temperature Range | -40°C to +85°C (Industrial) | -40°C to +125°C (Extended) | Determines the environments in which the device can reliably operate; the extended range part supports higher-temperature applications. |
| Memory Size | 256 Kbit (32K x 8) | 256 Kbit (32K x 8) | Defines the total storage capacity available for data and firmware; identical capacity means functional equivalence in storage. |
| Memory Organization | 32K x 8 | 32K x 8 | Specifies how bytes are arranged internally; matching organization ensures identical addressing behavior. |
| Interface Type | I²C (2-wire serial) | I²C (2-wire serial) | Determines the communication protocol used with the host controller; identical interface allows drop-in compatibility. |
| Supply Voltage Range | 2.5 V to 5.5 V | 2.5 V to 5.5 V | Defines the allowable power supply window; matching ranges ensure the same system power design works for both. |
| Maximum Clock Frequency | 400 kHz | 400 kHz | Sets the maximum data transfer rate on the I²C bus; identical frequency means the same timing budget applies. |
| Package / Case | 8-SOIC (SOIJ), Tape & Reel | 8-SOIC (SOIJ), Tube | Defines the physical footprint and PCB layout; same package body allows the same land pattern, though packing differs. |
| Write Cycle Time (Max) | 5 ms | 5 ms | Indicates the maximum time required to complete an internal write; matching values ensure identical write throughput behavior. |
| Endurance | 1,000,000 write cycles | 1,000,000 write cycles | Specifies how many write/erase cycles the memory can sustain; identical endurance means equivalent long-term reliability. |
| Data Retention | 200 years | 200 years | Indicates how long stored data remains valid without power; matching retention ensures equivalent non-volatile reliability. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 24LC256T-I/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 ~ 85°C (TA) | -40°C ~ 125°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What is the difference between the 24LC256T-I/SN and 24LC256-E/SN?
The primary difference is the operating temperature range. The 24LC256T-I/SN is rated for the industrial temperature range of -40°C to +85°C, while the 24LC256-E/SN is rated for the extended temperature range of -40°C to +125°C. Both are 256 Kbit I²C serial EEPROM devices in an 8-lead SOIC package.
Are the 24LC256T-I/SN and 24LC256-E/SN functionally interchangeable?
Yes, both devices are functionally identical 256 Kbit I²C serial EEPROMs with the same memory organization, I²C interface, page size, and operating voltage range of 2.5V to 5.5V. The only difference is the temperature grade. The 24LC256-E/SN can be used in place of the 24LC256T-I/SN in applications requiring a wider temperature range, provided the higher temperature grade is acceptable for the design.
What is the operating voltage range for both the 24LC256T-I/SN and 24LC256-E/SN?
Both devices operate over a voltage range of 2.5V to 5.5V, as specified in the Microchip 24LC256 datasheet. This applies to both the I-grade and E-grade versions.
What is the maximum clock frequency supported by the 24LC256T-I/SN and 24LC256-E/SN?
Both devices support a maximum I²C clock frequency of 400 kHz (Fast mode) across the full operating voltage range of 2.5V to 5.5V, per the Microchip 24LC256 datasheet.
What package type do the 24LC256T-I/SN and 24LC256-E/SN use?
Both the 24LC256T-I/SN and 24LC256-E/SN are offered in an 8-lead SOIC (150 mil) package, denoted by the "SN" suffix in the part number. The "T" in 24LC256T-I/SN indicates tape and reel packaging, while the 24LC256-E/SN may be supplied in standard tube or tape and reel depending on the ordering option.
What is the memory organization of the 24LC256T-I/SN and 24LC256-E/SN?
Both devices are 256 Kbit (32 Kbyte) serial EEPROMs organized as 32,768 words × 8 bits. They feature a 64-byte page write buffer and support byte write and page write operations via the I²C interface.
Can the 24LC256-E/SN be used as a drop-in replacement for the 24LC256T-I/SN in an existing design?
Yes, the 24LC256-E/SN is pin-compatible and functionally equivalent to the 24LC256T-I/SN. Because the E-grade device supports a wider temperature range (-40°C to +125°C) than the I-grade device (-40°C to +85°C), it can directly replace the I-grade version in any application within the I-grade temperature range, provided the packaging option (tape and reel vs. tube) is acceptable for the assembly process.
What are the typical applications for the 24LC256T-I/SN and 24LC256-E/SN?
Both devices are used for non-volatile data storage in a wide range of applications, including consumer electronics, industrial control systems, automotive modules, and telecommunications equipment. The 24LC256-E/SN is specifically suited for automotive and industrial applications that require an extended temperature range up to +125°C.