Part A
25LC1024T-E/SM
Tecnologia Microchip
- Lifecycle
- Active
- Stock
- 6964 PCS
- Package
- SOIC-8
- Series
- Memória
Replacement verdict
Not a drop-in replacement
The 25LC1024T-E/SM and 25LC160DT-E/SN16KVAO are not functionally interchangeable. The 25LC1024T-E/SM provides 1 Mbit of SPI serial EEPROM in an 8-lead SOIC package, while the 25LC160DT-E/SN16KVAO provides only 16 Kbit in an 8-lead SOIC package with an extended automotive temperature grade. The eightfold difference in memory density, divergent page size and instruction set behavior, and differing qualification levels make direct substitution impractical without a full redesign of the memory subsystem and firmware.
Different memory density
Different page size
Different instruction set
Different qualification grade
Parts at a glance
Part B
25LC160DT-E/SN16KVAO
Tecnologia Microchip
- Lifecycle
- Active
- Stock
- 3137 PCS
- Package
- SOIC-8
- Series
- Memória
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 25LC1024T-E/SM | 25LC160DT-E/SN16KVAO | Why it matters |
|---|---|---|---|
| Memory Density | 1 Mbit (128K x 8) | 16 Kbit (2K x 8) | Storage capacity determines whether the device can hold the required firmware, configuration, or data payload; a 64x difference is not substitutable. |
| Organization | 128K x 8 | 2K x 8 | Byte-per-word organization affects addressing and memory map compatibility in firmware. |
| Package / Case | 8-SOIC (SOIJ, 5.28mm width) | 8-SOIC (SOIC, 3.90mm width) | Different body widths require different PCB land patterns, so they are not drop-in footprint compatible. |
| Maximum Clock Frequency | 10 MHz | 3 MHz | Lower clock frequency reduces read/write throughput and may violate timing requirements of the host system. |
| Supply Voltage Range | 2.5 V to 5.5 V | 2.5 V to 5.5 V | Both support the same 2.5–5.5 V range, so supply compatibility is not a differentiator. |
| Page Size | 256 bytes | 16 bytes | Page size dictates the maximum bytes per write cycle; smaller pages increase write time and firmware complexity. |
| Temperature Range | -40°C to +125°C (Extended) | -40°C to +125°C (Extended, AEC-Q100) | Both cover extended temperature, but the automotive-qualified variant meets stricter reliability standards. |
| Interface Type | SPI (Serial Peripheral Interface) | SPI (Serial Peripheral Interface) | Both use SPI, so protocol-level compatibility exists, though command sets and addressing differ. |
| Automotive Qualification | Not AEC-Q100 qualified | AEC-Q100 qualified | Automotive qualification is required for under-hood and safety-critical applications; the non-qualified part cannot be substituted there. |
| Write Cycle Endurance | 1,000,000 cycles | 1,000,000 cycles | Equal endurance means both tolerate the same number of erase/write operations over product life. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 25LC1024T-E/SM | 25LC160DT-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 | 1Mb (128K x 8) | 16Kb (2K x 8) |
| Memory Interface | SPI | SPI |
| Clock Frequency | 20 MHz | 5 MHz |
| Write Cycle Time - Word Page | 6ms | 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 25LC1024T-E/SM and the 25LC160DT-E/SN16KVAO?
The 25LC1024T-E/SM is a 1 Mbit SPI serial EEPROM in an 8-lead SOIJ package, while the 25LC160DT-E/SN16KVAO is a 16 Kbit SPI serial EEPROM in an 8-lead SOIC package. The primary differences are memory density, package type, and the automotive qualification status of the 25LC160DT-E/SN16KVAO.
Are the 25LC1024T-E/SM and 25LC160DT-E/SN16KVAO pin-to-pin compatible?
Both devices use an 8-lead package with standard SPI pinout (CS, SO, WP, VSS, SI, SCK, HOLD, VCC), but the 25LC1024T-E/SM uses the SOIJ (narrow SOIC) package while the 25LC160DT-E/SN16KVAO uses the SOIC package. PCB land patterns may differ, so direct substitution requires verification against the respective datasheet package drawings.
What is the memory organization of each device?
The 25LC1024T-E/SM provides 1,048,576 bits organized as 131,072 bytes (128 Kbyte) with 256-byte page size. The 25LC160DT-E/SN16KVAO provides 16,384 bits organized as 2,048 bytes (2 Kbyte) with 16-byte page size. Both use byte-level and page-level write operations via SPI.
What SPI modes and clock speeds do these EEPROMs support?
Both devices support SPI modes 0 (0,0) and 3 (1,1). The 25LC1024T-E/SM supports clock frequencies up to 20 MHz, while the 25LC160DT-E/SN16KVAO supports clock frequencies up to 10 MHz. Designers must ensure the host SPI controller does not exceed the rated frequency of the selected device.
What are the operating voltage and temperature ranges for these devices?
The 25LC1024T-E/SM operates from 2.5 V to 5.5 V over the -40°C to +125°C extended temperature range. The 25LC160DT-E/SN16KVAO operates from 2.5 V to 5.5 V and is automotive qualified (AEC-Q100), with an operating temperature range of -40°C to +125°C. Both are suitable for industrial and automotive environments within their specified ratings.
What is the significance of the "VAO" suffix on the 25LC160DT-E/SN16KVAO?
The "VAO" suffix indicates that the 25LC160DT-E/SN16KVAO is an automotive-qualified device meeting AEC-Q100 requirements, suitable for use in automotive applications. The 25LC1024T-E/SM does not carry this automotive qualification suffix and is intended for general industrial and commercial applications.
Can the 25LC160DT-E/SN16KVAO be used as a drop-in replacement for the 25LC1024T-E/SM?
No. The 25LC160DT-E/SN16KVAO has only 16 Kbit of memory versus 1 Mbit for the 25LC1024T-E/SM, so it cannot store the same amount of data. Additionally, the page size differs (16 bytes vs 256 bytes), and the package types are not identical. A drop-in replacement is not possible without redesigning the firmware and verifying hardware compatibility.
What are the typical applications for each device?
The 25LC1024T-E/SM is typically used in applications requiring large non-volatile data storage, such as data logging, configuration storage, and firmware parameter storage in industrial equipment. The 25LC160DT-E/SN16KVAO is typically used in space-constrained automotive and industrial applications requiring small amounts of non-volatile parameter storage, such as sensor calibration data and system configuration settings.