FT24C128A-USG-B

Overview

The FT24C128A-USG-B is a 128K-bit (16K x 8) CMOS serial EEPROM manufactured by Fremont Micro Devices Ltd. It utilizes a standard 2-wire I2C bus interface for data transfer, supporting clock frequencies up to 400 kHz at operating voltages between 2.5V and 5.5V. The device features hardware write protection, self-timed write cycles with a maximum duration of 6 ms, and high endurance rated for 100,000 write/erase cycles. Data retention exceeds 40 years. It is available in an 8-pin USG surface-mount package.

Feature Summary

• Supports extended I2C protocol for memory access exceeding 16K-bit capacity
• Includes hardware write protection pin for array security
• Features Schmitt trigger inputs for noise suppression
• Enables 64-byte page write mode with partial page writes

Applications

• Industrial control systems requiring reliable non-volatile storage
• Automotive electronics applications
• Consumer devices needing compact memory solutions

Procurement Notes

Verify the manufacturer designation as Fremont Micro Devices Ltd against official datasheets, as this part number often appears under Fairchild Semiconductor or ON Semiconductor branding due to corporate acquisitions. Confirm the specific suffix 'B' corresponds to the intended temperature grade and packaging variant. Ensure compliance with RoHS directives if required for your assembly process. Cross-reference the 8-pin USG package dimensions with your PCB footprint design.

Selection Notes

Select this component when a 128K-bit capacity is required within a minimal 8-pin footprint. It is suitable for designs operating within the 2.5V to 5.5V voltage range. Consider the 400 kHz speed limit for system timing constraints. The industrial and automotive temperature grades offer flexibility for harsh environments compared to commercial-only variants.

Part Context

This device belongs to the FT24CxxA series of 2-wire serial EEPROMs. It shares architectural similarities with other industry-standard parts like the AT24C128 and FM24C128. The series is designed to replace legacy EEPROMs while offering improved power consumption and higher density in small packages. It is commonly used in embedded systems where space is limited.

Replacement Considerations

Compatible substitutes include the AT24C128C-SSHM-T from Microchip and the FM24C128 from Fairchild/ON Semiconductor. Verify pinout compatibility and voltage levels before substitution. Ensure the replacement supports the same 400 kHz I2C speed and 64-byte page write functionality.