Part A
25LC128T-E/SN
Mikrochip-Technologie
- Lifecycle
- Active
- Stock
- 5635 Stückzahl
- Package
- SOIC-8
- Series
- Speicher
Replacement verdict
Compatible functional replacement candidate
The 25LC128T-E/SN and 25LC128-E/SN16KVAO are functionally compatible 128 Kbit SPI serial EEPROM devices sharing the same memory organization, interface protocol, and supply voltage range. The 25LC128-E/SN16KVAO carries an automotive-grade qualification that extends its verified operating temperature capability, making it a suitable replacement candidate where higher temperature tolerance is required. Designers should confirm package footprint, temperature requirements, and qualification needs against the target application before substituting.
Memory Density and Organization
High match
Interface Protocol
High match
Supply Voltage Range
High match
Operating Temperature Range
Validation required
Parts at a glance
Part B
25LC128-E/SN16KVAO
Mikrochip-Technologie
- Lifecycle
- Active
- Stock
- 7092 Stückzahl
- Package
- SOIC-8
- Series
- Speicher
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 25LC128T-E/SN | 25LC128-E/SN16KVAO | Why it matters |
|---|---|---|---|
| Memory Type | EEPROM | EEPROM | Both are serial EEPROM devices, so the fundamental storage technology is the same. |
| Memory Organization | 16K x 8 | 16K x 8 | Identical organization means the same address space and byte-level access behavior. |
| Memory Size | 128 Kbit | 128 Kbit | Equal density ensures the same storage capacity for firmware, calibration, or data logging. |
| Interface Type | SPI | SPI | Both use SPI, so they are compatible with the same host controller interface. |
| Supply Voltage | 2.5 V to 5.5 V | 2.5 V to 5.5 V | Matching voltage ranges allow direct substitution in 3.3 V and 5 V systems. |
| Maximum Clock Frequency | 10 MHz | 10 MHz | Same maximum SPI clock supports identical read/write throughput. |
| Operating Temperature Range | -40°C to +125°C | -40°C to +125°C | Equivalent temperature ratings make both suitable for automotive and industrial environments. |
| Package / Case | 8-SOIC | 8-SOIC | Same package and pinout allow drop-in board replacement without layout changes. |
| Mounting Type | Surface Mount | Surface Mount | Both are SMD devices, so they fit the same assembly process and footprint. |
| Qualification Status | Not automotive qualified | AEC-Q100 qualified | The automotive-qualified version is required for safety and reliability in automotive applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 25LC128T-E/SN | 25LC128-E/SN16KVAO |
|---|---|---|
| Supplier | - | Microchip Technology |
| Series | - | Automotive, AEC-Q100 |
| Part Status | Active | Active |
| Memory Type | Non-Volatile | Non-Volatile |
| Memory Format | EEPROM | EEPROM |
| Technology | EEPROM | EEPROM |
| Memory Size | 128Kb (16K x 8) | 128Kb (16K x 8) |
| Memory Interface | SPI | SPI |
| Clock Frequency | 10 MHz | 5 MHz |
| Write Cycle Time - Word Page | 5ms | 5ms |
| 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 are the key differences between the 25LC128T-E/SN and the 25LC128-E/SN16KVAO?
The 25LC128T-E/SN is a standard 128 Kbit SPI serial EEPROM in an 8-lead SOIC package with a temperature range of -40°C to +125°C. The 25LC128-E/SN16KVAO is an automotive-qualified variant of the same 128 Kbit SPI EEPROM family, also in an 8-lead SOIC package, but it is released under the VAO (automotive) product qualification flow. The primary differences are the qualification grade, documentation, and traceability requirements, not the fundamental memory density or interface.
Are the 25LC128T-E/SN and 25LC128-E/SN16KVAO pin-to-pin compatible?
Yes. Both devices are offered in the same 8-lead SOIC package and use the standard 25LC128 pinout: CS, SO, WP, VSS, SI, SCK, HOLD, and VCC. The pin functions and package footprint are identical, so they are pin-to-pin compatible when the package option is the same.
Can the 25LC128T-E/SN be used as a drop-in replacement for the 25LC128-E/SN16KVAO in an automotive application?
No. The 25LC128-E/SN16KVAO is an automotive-qualified device released under the VAO flow, while the 25LC128T-E/SN is a standard industrial-grade part. For automotive applications requiring VAO qualification, the 25LC128-E/SN16KVAO must be used to meet the applicable qualification and documentation requirements. A standard part should not be substituted without validating the specific automotive qualification requirements of the end application.
Do both devices support the same SPI interface and operating voltage range?
Yes. Both are 128 Kbit SPI serial EEPROMs that support the standard SPI bus modes (0,0 and 1,1) and operate over the 2.5V to 5.5V supply voltage range typical of the 25LC128 family. The command set, including READ, WRITE, WRDI, WREN, RDSR, and WRSR, is the same across both variants.
What is the difference in temperature grade between the 25LC128T-E/SN and the 25LC128-E/SN16KVAO?
Both devices are specified for the extended industrial temperature range of -40°C to +125°C. The 25LC128-E/SN16KVAO carries the automotive VAO qualification, which includes additional testing and documentation beyond the standard extended temperature specification, but the rated operating temperature range is the same.
Are the ordering part numbers and packaging options different for these two devices?
Yes. The 25LC128T-E/SN uses the standard Microchip ordering suffix for tape and reel in an 8-lead SOIC package. The 25LC128-E/SN16KVAO uses the VAO-specific ordering suffix that identifies the automotive qualification flow and associated documentation. The package type is the same 8-lead SOIC, but the ordering codes and qualification documentation differ.
Which device should be selected for a non-automotive industrial design?
For non-automotive industrial designs, the 25LC128T-E/SN is the appropriate choice. It provides the same 128 Kbit SPI EEPROM functionality, extended temperature range, and 8-lead SOIC package without the additional cost and documentation associated with the automotive VAO qualification of the 25LC128-E/SN16KVAO.
Do both devices have the same endurance and data retention specifications?
Yes. Both the 25LC128T-E/SN and the 25LC128-E/SN16KVAO are specified with a minimum of 1,000,000 erase/write cycles and a data retention of greater than 200 years, consistent with the Microchip 25LC128 family datasheet. The VAO qualification does not change these fundamental memory cell characteristics.