25LC128-I/ST

Overview

The Microchip Technology 25LC128-I/ST is a 128 Kbit Serial Electrically Erasable PROM housed in an 8-lead TSSOP package. It features a 16,384 x 8-bit organization and communicates via a standard SPI-compatible serial bus with a maximum clock frequency of 10 MHz. The device operates within a supply voltage range of 2.5V to 5.5V and supports industrial temperature conditions from -40°C to +85°C. Key electrical characteristics include a standby current of 5 µA at 5.5V and self-timed erase/write cycles with a maximum duration of 5 ms.

Feature Summary

• Supports sequential read operations with automatic address pointer incrementation across the memory array.
• Includes built-in hardware write protection mechanisms utilizing a dedicated WP pin and STATUS register bits.
• Features a HOLD input that allows suspension of serial communication without resetting the data sequence.
• Provides block write protection capabilities allowing selective protection of none, one-quarter, one-half, or all array segments.

Applications

• Data storage for configuration parameters in microcontroller-based systems
• Logging operational history or event records in industrial equipment
• Storing calibration constants and device-specific identifiers

Procurement Notes

Verify the specific ordering suffix matches the required package type and temperature grade. Confirm the voltage range requirements align with the 2.5V minimum specification for the LC series. Ensure system design accounts for the 5 ms maximum internal write cycle time during power transitions.

Selection Notes

Select this component when a 128 Kbit capacity is required with SPI interface compatibility. The Industrial temperature grade (-40°C to +85°C) suits general electronic applications. Consider the 64-byte page size for write efficiency and ensure the host controller supports the necessary SPI modes and timing constraints.

Part Context

This part belongs to the 25XX128 family of serial EEPROMs manufactured by Microchip Technology. It shares functional similarities with the 25AA128 but differs in operating voltage specifications. The device is designed for non-volatile data retention and is available in multiple package options including DFN, PDIP, SOIC, and TSSOP.

Replacement Considerations

25LC128T-I/ST