25AA128T-I/SM

Memory IC Overview

The Microchip Technology 25AA128T-I/SM is a 128 Kbit (16,384 x 8-bit) Serial Electrically Erasable PROM accessed via an SPI-compatible serial bus. It operates within a supply voltage range of 1.8V to 5.5V and supports a maximum clock frequency of 10 MHz at 5.5V. The device features a 64-byte page size, self-timed erase/write cycles with a maximum duration of 5 ms, and industrial temperature operation from -40°C to +85°C. It is housed in an 8-lead SOIJ package.

Memory IC Feature Summary

• Low-Power CMOS technology for reduced current consumption across read, write, and standby modes.
• Hardware and software write protection mechanisms including block protection and power-on/off data protection circuitry.
• High reliability with significant endurance ratings and long-term data retention capabilities.
• Hold functionality allows suspension of serial communication without resetting the sequence.

Memory IC Applications

• Data storage for configuration parameters in microcontroller systems
• Logging application data requiring non-volatile retention
• Storing calibration constants or user settings in embedded devices

Memory IC Procurement Notes

Verify that the specific ordering suffix 'I/SM' corresponds to the Industrial temperature grade (-40°C to +85°C) and the 8-lead SOIJ package format. Confirm that the 'T' suffix indicates tape and reel packaging if required by automated assembly processes. Ensure compatibility with the system's SPI interface voltage levels and check for any specific RoHS compliance documentation relevant to the manufacturing date code.

Memory IC Selection Notes

Select this component when a 128 Kbit capacity is required with SPI interface compatibility. The 1.8V minimum operating voltage makes it suitable for low-voltage applications compared to the 2.5V minimum of the 25LC128 variant. Consider the 64-byte page size for write efficiency and ensure the system can handle the 5 ms internal write cycle time. Verify that the SOIJ package dimensions fit the PCB layout constraints.

Memory IC Part Context

This part belongs to the 25XX128 family of serial EEPROMs from Microchip Technology. It shares functional similarities with the 25LC128 but differs in its lower minimum supply voltage requirement of 1.8V versus 2.5V. The family utilizes a standard SPI protocol for communication and offers various package options including TSSOP, SOIC, and DFN to accommodate different design requirements.

Memory IC Replacement Considerations

The 25LC128T-I/SM is a functional substitute within the same family, though it requires a minimum supply voltage of 2.5V instead of 1.8V. Other 128 Kbit SPI EEPROMs from different manufacturers may require verification of pinout compatibility, voltage level tolerance, and command set adherence before replacement.