Part A
25LC128-I/SN
微芯片科技
- Lifecycle
- Active
- Stock
- 1836 件
- Series
- 記憶-記憶
Replacement verdict
Compatible functional replacement candidate
The 25LC128-I/SN and 25LC128T-E/SN are functionally equivalent 128 Kbit SPI serial EEPROM devices from the same manufacturer and family, sharing identical memory density, interface, voltage range, and package footprint. The primary distinction is the temperature grade and packaging option, making the 25LC128T-E/SN a viable functional replacement for the 25LC128-I/SN provided the extended temperature range and tape-and-reel packaging are acceptable for the target application.
Memory Density
High match
Interface Type
High match
Package Type
High match
Operating Temperature
Validation required
Parts at a glance
Part B
25LC128T-E/SN
微芯片科技
- Lifecycle
- Active
- Stock
- 5635 件
- Package
- SOIC-8
- Series
- 記憶力
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 25LC128-I/SN | 25LC128T-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 harsher thermal conditions. |
| Packaging / Reel Option | Tube | Tape & Reel | Affects assembly line handling; tape and reel is required for automated pick-and-place production, while tubes suit manual or low-volume assembly. |
| Memory Size | 128 Kbit | 128 Kbit | Defines the total storage capacity available for data logging or configuration storage. |
| Memory Organization | 16K x 8 | 16K x 8 | Specifies how bytes are arranged, which must match the addressing scheme used by the host firmware. |
| Interface Type | SPI | SPI | The communication protocol must be compatible with the host controller for the device to function. |
| Supply Voltage Range | 2.5 V to 5.5 V | 2.5 V to 5.5 V | Determines compatibility with the system power rail and logic levels. |
| Maximum Clock Frequency | 10 MHz | 10 MHz | Sets the upper limit on data transfer speed between the memory and the controller. |
| Package / Case | 8-SOIC | 8-SOIC | The physical footprint and pinout must match the PCB layout for a drop-in replacement. |
| Mounting Type | Surface Mount | Surface Mount | Must match the board assembly process and land pattern design. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 25LC128-I/SN | 25LC128T-E/SN |
|---|---|---|
| Part Status | Active | Active |
| Memory Type | Non-Volatile | Non-Volatile |
| Memory Format | EEPROM | EEPROM |
| Technology | EEPROM | EEPROM |
| Memory Size | 128Kbit | 128Kb (16K x 8) |
| Memory Interface | SPI | SPI |
| Clock Frequency | 10 MHz | 10 MHz |
| Write Cycle Time - Word Page | - | 5ms |
| 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 |
| Base Product Number | 25LC128 | - |
| Digi Key Programmable | Verified | - |
| Memory Organization | 16K x 8 | - |
| Write Cycle Time - Word, Page | 5ms | - |
| Packaging | Tube | - |
Frequently asked questions
What are the key differences between the 25LC128-I/SN and 25LC128T-E/SN?
The primary differences are the temperature range and packaging orientation. The 25LC128-I/SN is specified for the industrial temperature range of -40°C to +85°C and is supplied in standard tube packaging. The 25LC128T-E/SN is specified for the extended temperature range of -40°C to +125°C and is supplied in tape and reel packaging, as indicated by the "T" suffix.
Are the 25LC128-I/SN and 25LC128T-E/SN functionally interchangeable?
Yes, both devices are functionally identical 128 Kbit SPI serial EEPROMs from Microchip Technology. They share the same memory organization, operating voltage range of 2.5V to 5.5V, and SPI interface protocol. The differences are limited to the temperature grade and the shipping packaging.
What is the memory organization of these devices?
Both the 25LC128-I/SN and 25LC128T-E/SN are organized as 16,384 bytes (128 Kbit) of memory, arranged as 65,536 words of 8 bits each. They support byte-level and page-level writes with a 64-byte page size.
What is the operating voltage range for the 25LC128-I/SN and 25LC128T-E/SN?
Both devices operate over a voltage range of 2.5V to 5.5V, making them suitable for a wide variety of low-power and standard 3.3V or 5V systems.
What is the maximum clock frequency supported by these EEPROMs?
The 25LC128-I/SN and 25LC128T-E/SN support a maximum SPI clock frequency of 10 MHz, allowing for high-speed data transfer in embedded applications.
What package type do the 25LC128-I/SN and 25LC128T-E/SN use?
Both devices are offered in an 8-lead SOIC (SN) package. The package is a standard surface-mount plastic SOIC with a 3.90 mm body width, compliant with JEDEC MS-012.
Can the 25LC128T-E/SN be used in applications requiring the industrial temperature range?
Yes, the 25LC128T-E/SN is rated for the extended temperature range of -40°C to +125°C, which fully covers the industrial range of -40°C to +85°C. It can be used in industrial applications, but its higher temperature rating may be unnecessary if the application never exceeds +85°C.
What are the packaging options for the 25LC128-I/SN and 25LC128T-E/SN?
The 25LC128-I/SN is supplied in standard tube packaging. The 25LC128T-E/SN is supplied in tape and reel packaging, which is designated by the "T" in the part number and is suitable for automated pick-and-place assembly lines.