24LC128T-E/MS

Memory IC Overview

The Microchip Technology 24LC128T-E/MS is a 16K x 8 (128 Kbit) Serial Electrically Erasable PROM (EEPROM) housed in an 8-lead MSOP package. It operates within a voltage range of 2.5V to 5.5V and supports I2C compatible two-wire serial interfaces with a maximum clock frequency of 400 kHz. The device features a 64-byte page write buffer, self-timed erase/write cycles, and hardware write protection via the WP pin. It is rated for extended industrial temperatures from -40°C to +125°C.

Memory IC Feature Summary

• Supports cascading up to eight devices on the same bus using configurable chip select inputs A0, A1, and A2.
• Includes Schmitt trigger inputs for noise suppression and output slope control to eliminate ground bounce.
• Features hardware write protection that inhibits write operations when the WP pin is tied to VCC.
• Provides high ESD protection exceeding 4,000V and data retention capabilities greater than 200 years.

Memory IC Applications

• Personal communications systems requiring low-power non-volatile storage
• Data acquisition applications needing reliable parameter retention
• Embedded systems utilizing I2C bus architecture for configuration memory

Memory IC Procurement Notes

Verify the specific temperature grade suffix 'E' corresponds to the required extended operating range of -40°C to +125°C. Confirm the 'MS' suffix indicates the 8-lead MSOP package type. Ensure compatibility with the system's I2C voltage levels, as this variant requires a minimum supply voltage of 2.5V. Check for RoHS compliance status if environmental regulations apply to the manufacturing process.

Memory IC Selection Notes

Select this component when an I2C interface is required alongside extended temperature operation up to 125°C. The MSOP package is suitable for space-constrained surface-mount designs. Note that the A0 and A1 pins are not connected in this package, limiting bus expansion to two devices unless external logic is used. Compare against the Industrial grade 'I' variant if lower voltage operation down to 1.7V is necessary.

Memory IC Part Context

This part belongs to the 24XX128 family, which includes the 24AA128 and 24FC128 variants. While functionally similar, the 24LC128 series is distinguished by its 2.5V minimum operating voltage, unlike the 24AA128 which supports 1.7V. The 'T' designation indicates tape and reel packaging, facilitating automated assembly processes.

Memory IC Replacement Considerations

Direct substitutes include other 24LC128 variants with different packages such as 24LC128-I/SN or 24LC128-E/ST. Cross-family replacements like the 24AA128 offer wider voltage ranges but may require level shifting. Verify pinout compatibility, noting that A0 and A1 are NC in the MSOP package.