Part A
24LC512T-I/ST
Công nghệ Microchip
- Lifecycle
- Active
- Stock
- 6214 PCS
- Package
- TSSOP-8
- Series
- Memory
Replacement verdict
Compatible functional replacement candidate
The 24LC512T-I/ST and 24LC512-E/MS are functionally compatible 512Kbit I²C serial EEPROM devices sharing identical memory density, interface protocol, and supply voltage range. The primary distinction lies in their operating temperature grades and package footprints, making the 24LC512-E/MS a viable substitute for the 24LC512T-I/ST in extended-temperature applications where the MSOP-8 footprint can be accommodated.
Memory Density
High match
Interface Protocol
High match
Operating Temperature
Validation required
Package Type
Validation required
Parts at a glance
Part B
24LC512-E/MS
Công nghệ Microchip
- Lifecycle
- Active
- Stock
- 9495 PCS
- Package
- TSSOP-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 | 24LC512T-I/ST | 24LC512-E/MS | Why it matters |
|---|---|---|---|
| Manufacturer Package | TSSOP-8 | MSOP-8 | Different footprints require different PCB land patterns, so the parts are not drop-in replacements without a layout change. |
| Operating Temperature Range | -40°C to +85°C (Industrial) | -40°C to +125°C (Extended) | The extended temperature version supports harsher environments, which is critical for automotive and industrial applications. |
| Automotive Qualification | Not AEC-Q100 qualified | AEC-Q100 qualified | AEC-Q100 qualification is required for automotive designs, so only the E/MS variant is suitable for those applications. |
| Memory Size | 512 Kbit | 512 Kbit | Identical storage capacity ensures the same data storage capability in the target design. |
| Memory Organization | 64K x 8 | 64K x 8 | Matching organization means the same addressing scheme and software access patterns apply. |
| Interface Type | I2C (2-wire) | I2C (2-wire) | Same serial interface allows use with identical host controllers and firmware. |
| Supply Voltage Range | 2.5V to 5.5V | 2.5V to 5.5V | Identical voltage range ensures compatibility with the same power rails and logic levels. |
| Maximum Clock Frequency | 400 kHz | 400 kHz | Same maximum bus speed means equivalent read/write throughput and timing compatibility. |
| Mounting Type | Surface Mount | Surface Mount | Both are SMD devices, so they suit the same assembly process, though footprint differs. |
| Packaging | Tape & Reel | Tube | Different packaging affects automated pick-and-place assembly and inventory handling. |
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 | 24LC512T-I/ST | 24LC512-E/MS |
|---|---|---|
| Supplier | - | Microchip Technology |
| Part Status | Active | Active |
| Memory Type | Non-Volatile | Non-Volatile |
| Memory Format | EEPROM | EEPROM |
| Technology | EEPROM | EEPROM |
| Memory Size | 512Kb (64K x 8) | 512Kb (64K 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 are the key differences between the 24LC512T-I/ST and the 24LC512-E/MS?
The primary differences are the package type and the operating temperature range. The 24LC512T-I/ST is supplied in a TSSOP-8 package and is rated for the industrial temperature range of -40°C to +85°C. The 24LC512-E/MS is supplied in an MSOP-8 package and is rated for the extended temperature range of -40°C to +125°C. Both devices are 512 Kbit I²C serial EEPROMs from Microchip Technology with otherwise equivalent memory organization and electrical characteristics.
Are the 24LC512T-I/ST and 24LC512-E/MS functionally interchangeable?
Functionally, both devices provide 512 Kbit of I²C serial EEPROM with the same memory organization, page size, and interface protocol. However, they are not drop-in replacements because they use different package footprints (TSSOP-8 vs MSOP-8) and have different temperature ratings. A design change would be required to accommodate the package difference, and the target application must be evaluated against the applicable temperature grade.
What is the memory density and organization of these devices?
Both the 24LC512T-I/ST and 24LC512-E/MS are 512 Kbit (64 Kbyte) serial EEPROM devices organized as 65,536 words of 8 bits each. They support a 128-byte page write buffer and use a two-wire I²C serial interface.
What are the operating voltage and temperature ranges for each device?
The 24LC512T-I/ST operates over a voltage range of 2.5 V to 5.5 V and an industrial temperature range of -40°C to +85°C. The 24LC512-E/MS operates over a voltage range of 2.5 V to 5.5 V and an extended temperature range of -40°C to +125°C. The wider temperature range of the -E/MS version makes it suitable for harsher environments.
What I²C clock frequencies do these devices support?
Both the 24LC512T-I/ST and 24LC512-E/MS support I²C clock frequencies up to 400 kHz at 2.5 V and up to 1 MHz at 5.0 V, consistent with the Microchip 24LC512 datasheet specifications.
What package types are used for the 24LC512T-I/ST and 24LC512-E/MS?
The 24LC512T-I/ST is housed in an 8-lead TSSOP (Thin Shrink Small Outline Package) and is supplied in tape and reel. The 24LC512-E/MS is housed in an 8-lead MSOP (Mini Small Outline Package) and is also supplied in tape and reel. The package suffix in the part number indicates the package type: /ST for TSSOP and /MS for MSOP.
Can the 24LC512-E/MS be used as a substitute for the 24LC512T-I/ST in an existing design?
Direct substitution is not possible without a PCB layout change because the TSSOP-8 and MSOP-8 packages have different physical dimensions and land patterns. Additionally, the 24LC512-E/MS offers a wider temperature range, which is acceptable in most applications, but the designer must verify that the MSOP-8 footprint is available or can be accommodated on the existing board.
What are the typical applications for these EEPROM devices?
Both the 24LC512T-I/ST and 24LC512-E/MS are used in applications requiring non-volatile data storage, such as consumer electronics, industrial control systems, automotive modules, and medical devices. The 24LC512-E/MS is particularly suited for automotive and industrial applications that demand extended temperature operation up to +125°C.